@article{Klarner2020,
title = {Visible Light-driven Dehydrogenation of Benzylamine under Liberation of H2},
author = {Mara Klarner and Sebastian Hammon and Sebastian Feulner and Stephan Kümmel and Lothar Kador and Rhett Kempe},
doi = {10.1002/cctc.202000329},
year = {2020},
date = {2020-06-05},
journal = {ChemCatChem},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Stolte2020,
title = {1-Mono- and 1,7-Disubstituted Perylene Bisimide Dyes with Voluminous Groups at Bay Positions: In Search for Highly Effective Solid-State Fluorescence Materials},
author = {Matthias Stolte and Tim Schembri and Jasmin Sü ß and David Schmidt and Ana-Maria Krause and Myroslav O Vysotsky and Frank Würthner},
doi = {10.1021/acs.chemmater.0c02115},
year = {2020},
date = {2020-06-01},
journal = {Chemistry of Materials},
volume = {32},
number = {14},
pages = {6222--6236},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Narsaria2020,
title = {Computationally Guided Molecular Design to Minimize the LE/CT Gap in D-$uppi$-A Fluorinated Triarylboranes for Efficient TADF via D and $uppi$-Bridge Tuning},
author = {Ayush K Narsaria and Florian Rauch and Johannes Krebs and Peter Endres and Alexandra Friedrich and Ivo Krummenacher and Holger Braunschweig and Maik Finze and Jörn Nitsch and Matthias F Bickelhaupt and Todd B Marder},
doi = {10.1002/adfm.202002064},
year = {2020},
date = {2020-06-01},
journal = {Advanced Functional Materials},
volume = {30},
number = {31},
pages = {2002064},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Stegmaier_2020,
title = {The Intermetallic Type-I Clathrate Na 8 Zn 4 Ge 42},
author = {Saskia Stegmaier and Viktor Hlukhyy and Thomas F Fässler},
url = {https://onlinelibrary.wiley.com/doi/full/10.1002/zaac.201900253},
doi = {DOI: 10.1002/zaac.201900253},
year = {2020},
date = {2020-05-01},
journal = {Zeitschrift für anorganische und allgemeine Chemie},
volume = {646},
number = {14},
pages = {1073--1078},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Corp2020,
title = {Control of Excited-State Proton-Coupled Electron Transfer by Ultrafast Pump-Push-Probe Spectroscopy in Heptazine-Phenol Complexes: Implications for Photochemical Water Oxidation},
author = {Kathryn L Corp and Emily J Rabe and Xiang Huang and Johannes Ehrmaier and Mitchell E Kaiser and Andrzej L Sobolewski and Wolfgang Domcke and Cody W Schlenker},
url = {https://doi.org/10.1021/acs.jpcc.0c00415},
doi = {10.1021/acs.jpcc.0c00415},
issn = {1932-7447},
year = {2020},
date = {2020-04-01},
journal = {J. Phys. Chem. C},
volume = {124},
number = {17},
pages = {9151--9160},
publisher = {American Chemical Society},
abstract = {We demonstrate chemical tuning and laser-driven control of intermolecular H atom abstraction from protic solvent molecules. Using multipulse ultrafast pump-push-probe transient absorption (TA) spectroscopy, we monitor hydrogen abstraction by a functionalized heptazine (Hz) from substituted phenols in condensed-phase hydrogen-bonded complexes. Hz is the monomer unit of the ubiquitous organic polymeric photocatalyst graphitic carbon nitride (g-C3N4). Previously, we reported that the Hz derivative 2,5,8-tris(4-methoxyphenyl)-1,3,5,6,7,9,9b-heptaazaphenalene (TAHz) can photochemically abstract H atoms from water, in addition to exhibiting photocatalytic activity for H2 evolution matching that of g-C3N4 in aqueous suspensions. In the present work, we combine ultrafast multipulse TA spectroscopy with predictive wave function-based ab initio electronic-structure calculations to explore the role of mixed nπ*/ππ* upper excited states in directing H atom abstraction from hydroxylic compounds. We use an ultraviolet (365 nm) laser pulse to photoexcite TAHz to a bright upper excited state, and, after a relaxation period of roughly 6 ps, we use a near-infrared (NIR) (1150 nm) pulse to “push” the chromophore from the long-lived S1 state to a higher-lying excited state. When phenol is present, the NIR push induces a persistent decrease (ΔΔOD) in the S1 TA signal magnitude, indicating an impulsively driven change in photochemical branching ratios. In the presence of substituted phenols with electron-donating moieties, the magnitude of ΔΔOD diminishes markedly due to the increased excited-state reactivity of these complexes that accompanies the cathodic shift in phenol oxidation potential. In the latter case, H atom abstraction proceeds unaided by additional energy from the push pulse. These results reveal new insight into branching mechanisms among unreactive locally excited states and reactive intermolecular charge-transfer states. They also suggest molecular design strategies for functionalizing aza-aromatics to drive important photoreactions, such as H atom abstraction from water. More generally, this study demonstrates an avidly desired achievement in the field of photochemistry, rationally redirecting excited-state reactivity with light.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We demonstrate chemical tuning and laser-driven control of intermolecular H atom abstraction from protic solvent molecules. Using multipulse ultrafast pump-push-probe transient absorption (TA) spectroscopy, we monitor hydrogen abstraction by a functionalized heptazine (Hz) from substituted phenols in condensed-phase hydrogen-bonded complexes. Hz is the monomer unit of the ubiquitous organic polymeric photocatalyst graphitic carbon nitride (g-C3N4). Previously, we reported that the Hz derivative 2,5,8-tris(4-methoxyphenyl)-1,3,5,6,7,9,9b-heptaazaphenalene (TAHz) can photochemically abstract H atoms from water, in addition to exhibiting photocatalytic activity for H2 evolution matching that of g-C3N4 in aqueous suspensions. In the present work, we combine ultrafast multipulse TA spectroscopy with predictive wave function-based ab initio electronic-structure calculations to explore the role of mixed nπ*/ππ* upper excited states in directing H atom abstraction from hydroxylic compounds. We use an ultraviolet (365 nm) laser pulse to photoexcite TAHz to a bright upper excited state, and, after a relaxation period of roughly 6 ps, we use a near-infrared (NIR) (1150 nm) pulse to “push” the chromophore from the long-lived S1 state to a higher-lying excited state. When phenol is present, the NIR push induces a persistent decrease (ΔΔOD) in the S1 TA signal magnitude, indicating an impulsively driven change in photochemical branching ratios. In the presence of substituted phenols with electron-donating moieties, the magnitude of ΔΔOD diminishes markedly due to the increased excited-state reactivity of these complexes that accompanies the cathodic shift in phenol oxidation potential. In the latter case, H atom abstraction proceeds unaided by additional energy from the push pulse. These results reveal new insight into branching mechanisms among unreactive locally excited states and reactive intermolecular charge-transfer states. They also suggest molecular design strategies for functionalizing aza-aromatics to drive important photoreactions, such as H atom abstraction from water. More generally, this study demonstrates an avidly desired achievement in the field of photochemistry, rationally redirecting excited-state reactivity with light.
@article{Kick2020,
title = {Mobile Small Polarons Qualitatively Explain Conductivity in Lithium Titanium Oxide Battery Electrodes},
author = {Matthias Kick and Cristina Grosu and Markus Schuderer and Christoph Scheurer and Harald Oberhofer},
url = {https://doi.org/10.1021/acs.jpclett.0c00568},
doi = {10.1021/acs.jpclett.0c00568},
year = {2020},
date = {2020-04-01},
journal = {J. Phys. Chem. Lett.},
volume = {11},
number = {7},
pages = {2535--2540},
publisher = {American Chemical Society},
abstract = {Lithium titanium oxide Li4Ti5O12 is an intriguing anode material promising particularly long-life batteries, due to its remarkable phase stability during (dis)charging of the cell. However, its usage is limited by its low intrinsic electronic conductivity. Introducing oxygen vacancies can be one method for overcoming this drawback, possibly by altering the charge carrier transport mechanism. We use Hubbard corrected density functional theory to show that polaronic states in combination with a possible hopping mechanism can play a crucial role in the experimentally observed increase in electronic conductivity. To gauge polaronic charge mobility, we compute the relative stabilities of different localization patterns and estimate polaron hopping barrier heights.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lithium titanium oxide Li4Ti5O12 is an intriguing anode material promising particularly long-life batteries, due to its remarkable phase stability during (dis)charging of the cell. However, its usage is limited by its low intrinsic electronic conductivity. Introducing oxygen vacancies can be one method for overcoming this drawback, possibly by altering the charge carrier transport mechanism. We use Hubbard corrected density functional theory to show that polaronic states in combination with a possible hopping mechanism can play a crucial role in the experimentally observed increase in electronic conductivity. To gauge polaronic charge mobility, we compute the relative stabilities of different localization patterns and estimate polaron hopping barrier heights.
@article{Restle_2020b,
title = {Synthesis, Structure, Solid-State NMR Spectroscopy, and Electronic Structures of the Phosphidotrielates Li 3 AlP 2 and Li 3 GaP 2},
author = {Tassilo M F Restle and Jasmin V Dums and Gabriele Raudaschl-Sieber and Thomas F Fässler},
url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/chem.202000482},
doi = {DOI: 10.1002/chem.202000482},
year = {2020},
date = {2020-04-01},
journal = {Chemistry – A European Journal},
volume = {26},
number = {30},
pages = {6812--6819},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Mayer_2020,
title = {Lösemittel-induzierter Halbleiter-Metall-Übergang: Planare [Bi1-]-Zickzack-Ketten im metallischen KBi$cdot$NH3im Vergleich zu [Bi1-]-Helices im halbleitenden KBi},
author = {Kerstin Mayer and Jasmin V Dums and Christian B Benda and Wilhelm Klein and Thomas F Fässler},
url = {https://onlinelibrary.wiley.com/doi/full/10.1002/ange.201915735},
doi = {DOI: 10.1002/ange.201915735},
year = {2020},
date = {2020-04-01},
journal = {Angewandte Chemie},
volume = {132},
number = {17},
pages = {6866--6871},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Xu2020,
title = {Consecutive Charging of a Perylene Bisimide Dye by Multistep Low-Energy Solar-Light-Induced Electron Transfer Towards H 2 Evolution},
author = {Yucheng Xu and Jiaxin Zheng and Joachim O Lindner and Xinbo Wen and Nianqiang Jiang and Zhicheng Hu and Linlin Liu and Fei Huang and Frank Würthner and Zengqi Xie},
doi = {10.1002/anie.202001231},
year = {2020},
date = {2020-04-01},
journal = {Angewandte Chemie International Edition},
volume = {59},
number = {26},
pages = {10363--10367},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Gernert2020,
title = {Cyclic (Amino)(aryl)carbenes Enter the Field of Chromophore Ligands: Expanded $uppi$ System Leads to Unusually Deep Red Emitting CuI Compounds},
author = {Markus Gernert and Lukas Balles-Wolf and Florian Kerner and Ulrich Müller and Alexander Schmiedel and Marco Holzapfel and Christel M Marian and Jens Pflaum and Christoph Lambert and Andreas Steffen},
doi = {10.1021/jacs.0c02234},
year = {2020},
date = {2020-04-01},
journal = {Journal of the American Chemical Society},
volume = {142},
number = {19},
pages = {8897--8909},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Giesbrecht2020,
title = {Formation of stable 2D methylammonium antimony iodide phase for lead-free perovskite-like solar cellsast},
author = {Nadja Giesbrecht and Andreas Weis and Thomas Bein},
url = {https://doi.org/10.1088%2F2515-7655%2Fab78ef},
doi = {10.1088/2515-7655/ab78ef},
year = {2020},
date = {2020-03-01},
journal = {Journal of Physics: Energy},
volume = {2},
number = {2},
pages = {024007},
publisher = {IOP Publishing},
abstract = {The presence of lead in novel hybrid perovskite-based solar cells remains a significant issue regarding commercial applications. Therefore, antimony-based perovskite-like A3M2X9 structures are promising new candidates for low toxicity photovoltaic applications. So far, MA3Sb2I9 was reported to only crystallize in the ‘zero-dimensional’ (0D) dimer structure with wide indirect bandgap properties. However, the formation of the 2D layered polymorph is more suitable for solar cell applications due to its expected direct and narrow bandgap. Here, we demonstrate the first synthesis of phase pure 2D layered MA3Sb2I9, based on antimony acetate dissolved in alcoholic solvents. Using in situ XRD methods, we confirm the stability of the layered phase towards high temperature, but the exposure to 75% relative humidity for several hours leads to a rearrangement of the phase with partial formation of the 0D structure. We investigated the electronic band structure and confirmed experimentally the presence of a semi-direct bandgap at around 2.1 eV. Our work shows that careful control of nucleation via processing conditions can provide access to promising perovskite-like phases for photovoltaic applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The presence of lead in novel hybrid perovskite-based solar cells remains a significant issue regarding commercial applications. Therefore, antimony-based perovskite-like A3M2X9 structures are promising new candidates for low toxicity photovoltaic applications. So far, MA3Sb2I9 was reported to only crystallize in the ‘zero-dimensional’ (0D) dimer structure with wide indirect bandgap properties. However, the formation of the 2D layered polymorph is more suitable for solar cell applications due to its expected direct and narrow bandgap. Here, we demonstrate the first synthesis of phase pure 2D layered MA3Sb2I9, based on antimony acetate dissolved in alcoholic solvents. Using in situ XRD methods, we confirm the stability of the layered phase towards high temperature, but the exposure to 75% relative humidity for several hours leads to a rearrangement of the phase with partial formation of the 0D structure. We investigated the electronic band structure and confirmed experimentally the presence of a semi-direct bandgap at around 2.1 eV. Our work shows that careful control of nucleation via processing conditions can provide access to promising perovskite-like phases for photovoltaic applications.
@article{Charles2020,
title = {Phase Behavior and Substitution Limit of Mixed Cesium-Formamidinium Lead Triiodide Perovskites},
author = {Bethan Charles and Mark T Weller and Sebastian Rieger and Lauren E Hatcher and Paul F Henry and Jochen Feldmann and Daniel Wolverson and Chick C Wilson},
url = {https://doi.org/10.1021/acs.chemmater.9b04032},
doi = {10.1021/acs.chemmater.9b04032},
issn = {0897-4756},
year = {2020},
date = {2020-03-01},
journal = {Chem. Mater.},
volume = {32},
number = {6},
pages = {2282--2291},
publisher = {American Chemical Society},
abstract = {The mixed cation lead iodide perovskite photovoltaics show improved stability following site substitution of cesium ions (Cs+) onto the formamidinium cation sites (FA+) of (CH(NH2)2PbI3 (FAPbI3) and increased resistance to formation of the undesirable ∂-phase. The structural phase behavior of Cs0.1FA0.9PbI3 has been investigated by neutron powder diffraction (NPD), complemented by single crystal and power X-ray diffraction and photoluminescence spectroscopy. The Cs-substitution limit has been determined to be less than 15%, and the cubic α-phase, Cs0.1FA0.9PbI3, is shown to be synthesizable in bulk and stable at 300 K. On cooling the cubic Cs0.1FA0.9PbI3, a slow, second-order cubic to tetragonal transition is observed close to 290 K, with variable temperature NPD indicating the presence of the tetragonal β-phase, adopting the space group P4/mbm between 290 and 180 K. An orthorhombic phase or twinned tetragonal phase is formed below 180 K, and the temperature for further transition to a disordered state is lowered to 125 K compared to that seen in phase pure α-FAPbI3 (140 K). These results demonstrate the importance of understanding the effect of cation site substitution on structure-property relationships in perovskite materials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The mixed cation lead iodide perovskite photovoltaics show improved stability following site substitution of cesium ions (Cs+) onto the formamidinium cation sites (FA+) of (CH(NH2)2PbI3 (FAPbI3) and increased resistance to formation of the undesirable ∂-phase. The structural phase behavior of Cs0.1FA0.9PbI3 has been investigated by neutron powder diffraction (NPD), complemented by single crystal and power X-ray diffraction and photoluminescence spectroscopy. The Cs-substitution limit has been determined to be less than 15%, and the cubic α-phase, Cs0.1FA0.9PbI3, is shown to be synthesizable in bulk and stable at 300 K. On cooling the cubic Cs0.1FA0.9PbI3, a slow, second-order cubic to tetragonal transition is observed close to 290 K, with variable temperature NPD indicating the presence of the tetragonal β-phase, adopting the space group P4/mbm between 290 and 180 K. An orthorhombic phase or twinned tetragonal phase is formed below 180 K, and the temperature for further transition to a disordered state is lowered to 125 K compared to that seen in phase pure α-FAPbI3 (140 K). These results demonstrate the importance of understanding the effect of cation site substitution on structure-property relationships in perovskite materials.
Urban, Patrick; Pritzl, Stefanie D; Ober, Martina F; Dirscherl, Christina F; Pernpeintner, Carla; Konrad, David B; Frank, James A; Trauner, Dirk; Nickel, Bert; Lohmueller, Theobald: A Lipid Photoswitch Controls Fluidity in Supported Bilayer Membranes. In: Langmuir, 36 (10), pp. 2629–2634, 2020, ISSN: 0743-7463.(Type: Journal Article | Abstract | Links | BibTeX)
@article{Urban2020,
title = {A Lipid Photoswitch Controls Fluidity in Supported Bilayer Membranes},
author = {Patrick Urban and Stefanie D Pritzl and Martina F Ober and Christina F Dirscherl and Carla Pernpeintner and David B Konrad and James A Frank and Dirk Trauner and Bert Nickel and Theobald Lohmueller},
url = {https://doi.org/10.1021/acs.langmuir.9b02942},
doi = {10.1021/acs.langmuir.9b02942},
issn = {0743-7463},
year = {2020},
date = {2020-03-01},
journal = {Langmuir},
volume = {36},
number = {10},
pages = {2629--2634},
publisher = {American Chemical Society},
abstract = {Supported lipid bilayer (SLB) membranes are key elements to mimic membrane interfaces on a planar surface. Here, we demonstrate that azobenzene photolipids (azo-PC) form fluid, homogeneous SLBs. Diffusion properties of azo-PC within SLBs were probed by fluorescence microscopy and fluorescence recovery after photobleaching. At ambient conditions, we find that the trans-to-cis isomerization causes an increase of the diffusion constant by a factor of two. Simultaneous excitation with two wavelengths and variable intensities furthermore allows to adjust the diffusion constant D continuously. X-ray reflectometry and small-angle scattering measurements reveal that membrane photoisomerization results in a bilayer thickness reduction of ∼0.4 nm (or 10%). While thermally induced back-switching is not observed, we find that the trans bilayer fluidity is increasing with higher temperatures. This change in diffusion constant is accompanied by a red-shift in the absorption spectra. Based on these results, we suggest that the reduced diffusivity of trans-azo-PC is controlled by intermolecular interactions that also give rise to H-aggregate formation in bilayer membranes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Supported lipid bilayer (SLB) membranes are key elements to mimic membrane interfaces on a planar surface. Here, we demonstrate that azobenzene photolipids (azo-PC) form fluid, homogeneous SLBs. Diffusion properties of azo-PC within SLBs were probed by fluorescence microscopy and fluorescence recovery after photobleaching. At ambient conditions, we find that the trans-to-cis isomerization causes an increase of the diffusion constant by a factor of two. Simultaneous excitation with two wavelengths and variable intensities furthermore allows to adjust the diffusion constant D continuously. X-ray reflectometry and small-angle scattering measurements reveal that membrane photoisomerization results in a bilayer thickness reduction of ∼0.4 nm (or 10%). While thermally induced back-switching is not observed, we find that the trans bilayer fluidity is increasing with higher temperatures. This change in diffusion constant is accompanied by a red-shift in the absorption spectra. Based on these results, we suggest that the reduced diffusivity of trans-azo-PC is controlled by intermolecular interactions that also give rise to H-aggregate formation in bilayer membranes.
@article{Geiger2020,
title = {Effect of the Degree of the Gate-Dielectric Surface Roughness on the Performance of Bottom-Gate Organic Thin-Film Transistors},
author = {Michael Geiger and Rachana Acharya and Eric Reutter and Thomas Ferschke and Ute Zschieschang and Jürgen Weis and Jens Pflaum and Hagen Klauk and Ralf Thomas Weitz},
doi = {10.1002/admi.201902145},
year = {2020},
date = {2020-03-01},
journal = {Advanced Materials Interfaces},
volume = {7},
number = {10},
pages = {1902145},
publisher = {Wiley},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Silva2020,
title = {Efficient Electronic Coupling in Perylenediimide Multilayered Films on Indium Tin Oxide},
author = {Barbara P G Silva and Bruna Tosco and Daniel Z de Florio and Vladimir Stepanenko and Frank Würthner and Jos é and Sergio Brochsztain},
doi = {10.1021/acs.jpcc.9b11373},
year = {2020},
date = {2020-02-01},
journal = {The Journal of Physical Chemistry C},
volume = {124},
number = {10},
pages = {5541--5551},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Biewald2020,
title = {Local Disorder at the Phase Transition Interrupts Ambipolar Charge Carrier Transport in Large Crystal Methylammonium Lead Iodide Thin Films},
author = {Alexander Biewald and Nadja Giesbrecht and Thomas Bein and Pablo Docampo and Achim Hartschuh and Richard Ciesielski},
url = {https://doi.org/10.1021/acs.jpcc.0c06240},
doi = {10.1021/acs.jpcc.0c06240},
year = {2020},
date = {2020-01-01},
journal = {The Journal of Physical Chemistry C},
volume = {124},
number = {38},
pages = {20757-20764},
abstract = {The low-temperature transition from a tetragonal to an orthorhombic crystal phase in methylammonium lead iodide (MAPI) is accompanied by drastic changes in the charge carrier mobility around a critical temperature of approximately 164 K. This transition is studied here using photoluminescence (PL) microscopy on large crystal MAPI thin films, which is extremely sensitive to modifications of the charge carrier dynamics and can resolve physical properties on a single-grain level. The key observation is that ambipolar charge carrier diffusion suddenly stops when the temperature falls below the phase transition temperature. From coexisting PL bands and their spatial distribution, it is concluded that the temperature range from just below the phase transition until about 150 K is determined by a mixed phase where small orthorhombic and tetragonal domains coexist. This results in local disorder, which hinders ambipolar charge carrier diffusion.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The low-temperature transition from a tetragonal to an orthorhombic crystal phase in methylammonium lead iodide (MAPI) is accompanied by drastic changes in the charge carrier mobility around a critical temperature of approximately 164 K. This transition is studied here using photoluminescence (PL) microscopy on large crystal MAPI thin films, which is extremely sensitive to modifications of the charge carrier dynamics and can resolve physical properties on a single-grain level. The key observation is that ambipolar charge carrier diffusion suddenly stops when the temperature falls below the phase transition temperature. From coexisting PL bands and their spatial distribution, it is concluded that the temperature range from just below the phase transition until about 150 K is determined by a mixed phase where small orthorhombic and tetragonal domains coexist. This results in local disorder, which hinders ambipolar charge carrier diffusion.
@article{Kampmann2020,
title = {How photocorrosion can trick you: a detailed study on low-bandgap Li doped CuO photocathodes for solar hydrogen production},
author = {Jonathan Kampmann and Sophia Betzler and Hamidreza Hajiyani and Sebastian Häringer and Michael Beetz and Tristan Harzer and Jürgen Kraus and Bettina V Lotsch and Christina Scheu and Rossitza Pentcheva and Dina Fattakhova-Rohlfing and Thomas Bein},
url = {http://dx.doi.org/10.1039/C9NR10250G},
doi = {10.1039/C9NR10250G},
year = {2020},
date = {2020-01-01},
journal = {Nanoscale},
volume = {12},
pages = {7766-7775},
publisher = {The Royal Society of Chemistry},
abstract = {The efficiency of photoelectrochemical tandem cells is still limited by the availability of stable low band gap electrodes. In this work, we report a photocathode based on lithium doped copper(ii) oxide, a black p-type semiconductor. Density functional theory calculations with a Hubbard U term show that low concentrations of Li (Li0.03Cu0.97O) lead to an upward shift of the valence band maximum that crosses the Fermi level and results in a p-type semiconductor. Therefore, Li doping emerged as a suitable approach to manipulate the electronic structure of copper oxide based photocathodes. As this material class suffers from instability in water under operating conditions, the recorded photocurrents are repeatedly misinterpreted as hydrogen evolution evidence. We investigated the photocorrosion behavior of LixCu1−xO cathodes in detail and give the first mechanistic study of the fundamental physical process. The reduced copper oxide species were localized by electron energy loss spectroscopy mapping. Cu2O grows as distinct crystallites on the surface of LixCu1−xO instead of forming a dense layer. Additionally, there is no obvious Cu2O gradient inside the films, as Cu2O seems to form on all LixCu1−xO nanocrystals exposed to water. The application of a thin Ti0.8Nb0.2Ox coating by atomic layer deposition and the deposition of a platinum co-catalyst increased the stability of LixCu1−xO against decomposition. These devices showed a stable hydrogen evolution for 15 minutes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The efficiency of photoelectrochemical tandem cells is still limited by the availability of stable low band gap electrodes. In this work, we report a photocathode based on lithium doped copper(ii) oxide, a black p-type semiconductor. Density functional theory calculations with a Hubbard U term show that low concentrations of Li (Li0.03Cu0.97O) lead to an upward shift of the valence band maximum that crosses the Fermi level and results in a p-type semiconductor. Therefore, Li doping emerged as a suitable approach to manipulate the electronic structure of copper oxide based photocathodes. As this material class suffers from instability in water under operating conditions, the recorded photocurrents are repeatedly misinterpreted as hydrogen evolution evidence. We investigated the photocorrosion behavior of LixCu1−xO cathodes in detail and give the first mechanistic study of the fundamental physical process. The reduced copper oxide species were localized by electron energy loss spectroscopy mapping. Cu2O grows as distinct crystallites on the surface of LixCu1−xO instead of forming a dense layer. Additionally, there is no obvious Cu2O gradient inside the films, as Cu2O seems to form on all LixCu1−xO nanocrystals exposed to water. The application of a thin Ti0.8Nb0.2Ox coating by atomic layer deposition and the deposition of a platinum co-catalyst increased the stability of LixCu1−xO against decomposition. These devices showed a stable hydrogen evolution for 15 minutes.
@article{Zehetmaier2020,
title = {Nanocellulose-Mediated Transition of Lithium-Rich Pseudo-Quaternary Metal Oxide Nanoparticles into Lithium Nickel Cobalt Manganese Oxide (NCM) Nanostructures},
author = {Peter M Zehetmaier and Florian Zoller and Michael Beetz and Maximilian A Plaß and Sebastian Häringer and Bernhard Böller and Markus Döblinger and Thomas Bein and Dina Fattakhova-Rohlfing},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/cnma.201900748},
doi = {https://doi.org/10.1002/cnma.201900748},
year = {2020},
date = {2020-01-01},
journal = {ChemNanoMat},
volume = {6},
number = {4},
pages = {618-628},
abstract = {Abstract We report the syntheses of various compounds within the pseudo-quaternary system of the type LiwNixCoyMnzOδ (δ≤1) (pre-NCMs). Four different compositions of this compound were realized as ultrasmall crystalline nanoparticles of 1–4 nm diameter using low-temperature solvothermal reaction conditions in tert-butanol at only 170 °C. All of the pre-NCMs crystallize in the rock-salt structure and their lithium content is between 20% and 30% with respect to the complete metal content. By adjusting the lithium content to 105% stoichiometry in the solvothermal reaction, the pre-NCMs can easily react to the respective Li(NixCoyMnz)O2 (NCM) nanoparticles. Furthermore, nanosized desert-rose structured NCMs were obtained after addition of nanocellulose during the synthesis. By using the mixed metal monoxides as precursor for the NCMs, cation mixing between lithium and nickel is favored and gets more pronounced with increasing nickel content. The cation mixing effect compromises good electrochemical capacity retention, but the desert-rose structure nevertheless enables enhanced stability at high power conditions, especially for NCM333.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Abstract We report the syntheses of various compounds within the pseudo-quaternary system of the type LiwNixCoyMnzOδ (δ≤1) (pre-NCMs). Four different compositions of this compound were realized as ultrasmall crystalline nanoparticles of 1–4 nm diameter using low-temperature solvothermal reaction conditions in tert-butanol at only 170 °C. All of the pre-NCMs crystallize in the rock-salt structure and their lithium content is between 20% and 30% with respect to the complete metal content. By adjusting the lithium content to 105% stoichiometry in the solvothermal reaction, the pre-NCMs can easily react to the respective Li(NixCoyMnz)O2 (NCM) nanoparticles. Furthermore, nanosized desert-rose structured NCMs were obtained after addition of nanocellulose during the synthesis. By using the mixed metal monoxides as precursor for the NCMs, cation mixing between lithium and nickel is favored and gets more pronounced with increasing nickel content. The cation mixing effect compromises good electrochemical capacity retention, but the desert-rose structure nevertheless enables enhanced stability at high power conditions, especially for NCM333.
@article{Fang2020,
title = {Photobase effect for just-in-time delivery in photocatalytic hydrogen generation},
author = {Jiawen Fang and Tushar Debnath and Santanu Bhattacharyya and Markus Döblinger and Jochen Feldmann and Jacek K Stolarczyk},
url = {https://doi.org/10.1038/s41467-020-18583-6},
doi = {10.1038/s41467-020-18583-6},
issn = {2041-1723},
year = {2020},
date = {2020-01-01},
journal = {Nature Communications},
volume = {11},
number = {1},
pages = {5179},
abstract = {Carbon dots (CDs) are a promising nanomaterial for photocatalytic applications. However, the mechanism of the photocatalytic processes remains the subject of a debate due to the complex internal structure of the CDs, comprising crystalline and molecular units embedded in an amorphous matrix, rendering the analysis of the charge and energy transfer pathways between the constituent parts very challenging. Here we propose that the photobasic effect, that is the abstraction of a proton from water upon excitation by light, facilitates the photoexcited electron transfer to the proton. We show that the controlled inclusion in CDs of a model photobase, acridine, resembling the molecular moieties found in photocatalytically active CDs, strongly increases hydrogen generation. Ultrafast spectroscopy measurements reveal proton transfer within 30 ps of the excitation. This way, we use a model system to show that the photobasic effect may be contributing to the photocatalytic H2 generation of carbon nanomaterials and suggest that it may be tuned to achieve further improvements. The study demonstrates the critical role of the understanding the dynamics of the CDs in the design of next generation photocatalysts.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Carbon dots (CDs) are a promising nanomaterial for photocatalytic applications. However, the mechanism of the photocatalytic processes remains the subject of a debate due to the complex internal structure of the CDs, comprising crystalline and molecular units embedded in an amorphous matrix, rendering the analysis of the charge and energy transfer pathways between the constituent parts very challenging. Here we propose that the photobasic effect, that is the abstraction of a proton from water upon excitation by light, facilitates the photoexcited electron transfer to the proton. We show that the controlled inclusion in CDs of a model photobase, acridine, resembling the molecular moieties found in photocatalytically active CDs, strongly increases hydrogen generation. Ultrafast spectroscopy measurements reveal proton transfer within 30 ps of the excitation. This way, we use a model system to show that the photobasic effect may be contributing to the photocatalytic H2 generation of carbon nanomaterials and suggest that it may be tuned to achieve further improvements. The study demonstrates the critical role of the understanding the dynamics of the CDs in the design of next generation photocatalysts.
@article{Huang2020,
title = {Growth of Perovskite CsPbBr3 Nanocrystals and Their Formed Superstructures Revealed by In Situ Spectroscopy},
author = {He Huang and Maximilian W Feil and Simon Fuchs and Tushar Debnath and Alexander F Richter and Yu Tong and Linzhong Wu and Yiou Wang and Markus Döblinger and Bert Nickel},
url = {https://doi.org/10.1021/acs.chemmater.0c02467},
doi = {10.1021/acs.chemmater.0c02467},
year = {2020},
date = {2020-01-01},
journal = {Chemistry of Materials},
volume = {32},
number = {20},
pages = {8877-8884},
abstract = {Metal halide perovskites have attracted substantial interest because of their promising properties for optoelectronic applications. Despite much progress made in the field, the exact growth mechanism of perovskite nanocrystals (e.g., CsPbBr3) remains elusive and further improvement of their controllable synthesis is challenging. Herein, we point out different phenomena during the processes of growth, cooling, and purification of high-quality CsPbBr3 nanocrystals using in situ photoluminescence spectroscopy. The as-synthesized materials have been further characterized by time-resolved transient differential transmission and photoluminescence spectroscopies. Using X-ray scattering, we confirm that nanocrystals form superstructures during the process of cooling already in dispersion, which is frequently ignored. The purification process is explained using a proposed model based on the self-size-selection. On the one hand, such superstructures pave a potential pathway to the fabrication of high-quality devices such as light-emitting devices. On the other hand, the approach to reveal their formation process benefits the comparison and understanding of the difference between nanocrystals and supercrystals. The fact that superstructures form already during synthesis may also apply to the different perovskite systems and thus help to improve the quality of the as-prepared nanocrystals.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Metal halide perovskites have attracted substantial interest because of their promising properties for optoelectronic applications. Despite much progress made in the field, the exact growth mechanism of perovskite nanocrystals (e.g., CsPbBr3) remains elusive and further improvement of their controllable synthesis is challenging. Herein, we point out different phenomena during the processes of growth, cooling, and purification of high-quality CsPbBr3 nanocrystals using in situ photoluminescence spectroscopy. The as-synthesized materials have been further characterized by time-resolved transient differential transmission and photoluminescence spectroscopies. Using X-ray scattering, we confirm that nanocrystals form superstructures during the process of cooling already in dispersion, which is frequently ignored. The purification process is explained using a proposed model based on the self-size-selection. On the one hand, such superstructures pave a potential pathway to the fabrication of high-quality devices such as light-emitting devices. On the other hand, the approach to reveal their formation process benefits the comparison and understanding of the difference between nanocrystals and supercrystals. The fact that superstructures form already during synthesis may also apply to the different perovskite systems and thus help to improve the quality of the as-prepared nanocrystals.
@article{ISI:000398246900075b,
title = {Suppression of Thermally Induced Fullerene Aggregation in
Polyfullerene-Based Multiacceptor Organic Solar Cells},
author = {Simon A Dowland and Michael Salvador and Jose Dario Perea and Nicola Gasparin and Stefan Langner and Sambatra Rajoelson and Hasina H Ramanitra and Benjamin D Lindner and Andres Osvet and Christoph J Brabec and Roger C Hiorns and Hans-Joachim Egelhaaf},
doi = {10.1021/acsami.7b00401},
issn = {1944-8244},
year = {2017},
date = {2017-03-01},
journal = {ACS APPLIED MATERIALS & INTERFACES},
volume = {9},
number = {12},
pages = {10971-10982},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000398014800018b,
title = {Crystallization of Sensitizers Controls Morphology and Performance in
Si-/C-PCPDTBT-Sensitized P3HT:ICBA Ternary Blends},
author = {Xiaoyan Du and Xuechen Jiao and Stefanie Rechberger and Jose Dario Perea and Markus Meyer and Negar Kazerouni and Erdmann Spiecker and Harald Ade and Christoph J Brabec and Rainer H Fink and Tayebeh Ameri},
doi = {10.1021/acs.macromol.6b02699},
issn = {0024-9297},
year = {2017},
date = {2017-03-01},
journal = {MACROMOLECULES},
volume = {50},
number = {6},
pages = {2415-2423},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000397008700001b,
title = {Revised domain structure of ulvan lyase and characterization of the
first ulvan binding domain},
author = {Rebecca L J Melcher and Marten Neumann and Juan Pablo Fuenzalida Werner and Franziska Groehn and Bruno M Moerschbacher},
doi = {10.1038/srep44115},
issn = {2045-2322},
year = {2017},
date = {2017-03-01},
journal = {SCIENTIFIC REPORTS},
volume = {7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000396856700001b,
title = {Hierarchical on-surface synthesis and electronic structure of
carbonyl-functionalized one- and two-dimensional covalent
nanoarchitectures},
author = {Christian Steiner and Julian Gebhardt and Maximilian Ammon and Zechao Yang and Alexander Heidenreich and Natalie Hammer and Andreas Goerling and Milan Kivala and Sabine Maier},
doi = {10.1038/ncomms14765},
issn = {2041-1723},
year = {2017},
date = {2017-03-01},
journal = {NATURE COMMUNICATIONS},
volume = {8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000396331700018b,
title = {Overcoming Interfacial Losses in Solution-Processed Organic
Multi-Junction Solar Cells},
author = {Xiaoyan Du and Ole Lytken and Manuela S Killian and Jiamin Cao and Tobias Stubhan and Mathieu Turbiez and Patrik Schmuki and Hans-Peter Steinrueck and Liming Ding and Rainer H Fink and Ning Li and Christoph J Brabec},
doi = {10.1002/aenm.201601959},
issn = {1614-6832},
year = {2017},
date = {2017-03-01},
journal = {ADVANCED ENERGY MATERIALS},
volume = {7},
number = {5},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000398014900037b,
title = {Directional Charge-Carrier Transport in Oriented Benzodithiophene
Covalent Organic Framework Thin Films},
author = {Dana D Medina and Michiel L Petrus and Askhat N Jumabekov and Johannes T Margraf and Simon Weinberger and Julian M Rotter and Timothy Clark and Thomas Bein},
doi = {10.1021/acsnano.6b07692},
issn = {1936-0851},
year = {2017},
date = {2017-03-01},
journal = {ACS NANO},
volume = {11},
number = {3},
pages = {2706-2713},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000395544000013b,
title = {Synthesis, physical properties, and chemistry of
donor-acceptor-substituted pentacenes},
author = {Dan Lehnherr and Matthias Adam and Adrian H Murray and Robert McDonald and Frank Hampel and Rik R Tykwinski},
doi = {10.1139/cjc-2016-0450},
issn = {0008-4042},
year = {2017},
date = {2017-03-01},
journal = {CANADIAN JOURNAL OF CHEMISTRY},
volume = {95},
number = {3, SI},
pages = {303-314},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000396185800058b,
title = {Exciton Coupling of Merocyanine Dyes from H- to J-type in the Solid
State by Crystal Engineering},
author = {Andreas Liess and Aifeng Lv and Alhama Atjona-Esteban and David Bialas and Ana-Maria Krause and Vladimir Stepanenko and Matthias Stolte and Frank Wuerthner},
doi = {10.1021/acs.nanolett.6b04995},
issn = {1530-6984},
year = {2017},
date = {2017-03-01},
journal = {NANO LETTERS},
volume = {17},
number = {3},
pages = {1719-1726},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000393355900056c,
title = {Solvent-Morphology-Property Relationship of PTB7:PC71BM Polymer Solar
Cells},
author = {Shuai Guo and Weijia Wang and Eva M Herzig and Anna Naumann and Gregory Tainter and Jan Perkh and Peter Mueller-Buschbaum},
doi = {10.1021/acsami.6b14926},
issn = {1944-8244},
year = {2017},
date = {2017-02-01},
journal = {ACS APPLIED MATERIALS & INTERFACES},
volume = {9},
number = {4},
pages = {3740-3748},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000395289400017b,
title = {Nanoimprint methods for the fabrication of macroscopic plasmonically
active metal nanostructures},
author = {Robin D Nagel and Simon Filser and Tianyue Zhang and Aurora Manzi and Konrad Schoenleber and James Lindsly and Josef Zimmermann and Thomas L Maier and Giuseppe Scarpa and Katharina Krischer and Paolo Lugli},
doi = {10.1063/1.4976860},
issn = {0021-8979},
year = {2017},
date = {2017-02-01},
journal = {JOURNAL OF APPLIED PHYSICS},
volume = {121},
number = {8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394683400004b,
title = {Rock Salt Ni/Co Oxides with Unusual Nanoscale-Stabilized Composition as Water Splitting Electrocatalysts},
author = {Ksenia Fominykh and Guelen Ceren Tok and Patrick Zeller and Hamidreza Hajiyani and Thomas Miller and Markus Doeblinger and Rossitza Pentcheva and Thomas Bein and Dina Fattakhova-Rohlfing},
doi = {10.1002/adfm.201605121},
issn = {1616-301X},
year = {2017},
date = {2017-02-01},
journal = {ADVANCED FUNCTIONAL MATERIALS},
volume = {27},
number = {8},
pages = {1605121},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394738300001b,
title = {Abnormal strong burn-in degradation of highly efficient polymer solar
cells caused by spinodal donor-acceptor demixing},
author = {Ning Li and Jose Dario Perea and Thaer Kassar and Moses Richter and Thomas Heumueller and Gebhard J Matt and Yi Hou and Nusret S Gueldal and Haiwei Chen and Shi Chen and Stefan Langner and Marvin Berlinghof and Tobias Unruh and Christoph J Brabec},
doi = {10.1038/ncomms14541},
issn = {2041-1723},
year = {2017},
date = {2017-02-01},
journal = {NATURE COMMUNICATIONS},
volume = {8},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394399600008b,
title = {Liquid-liquid interface assisted synthesis of SnO2 nanorods with tunable
length for enhanced performance in dye-sensitized solar cells},
author = {Yichuan Rui and Hao Xiong and Bo Su and Hongzhi Wang and Qinghong Zhang and Jingli Xu and Peter Mueller-Buschbaum},
doi = {10.1016/j.electacta.2017.01.004},
issn = {0013-4686},
year = {2017},
date = {2017-02-01},
journal = {ELECTROCHIMICA ACTA},
volume = {227},
pages = {49-60},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394940100004b,
title = {Overcoming the Thermal Instability of Efficient Polymer Solar Cells by
Employing Novel Fullerene-Based Acceptors},
author = {Chaohong Zhang and Alexander Mumyatov and Stefan Langner and Jose Dario Perea and Thaer Kassar and Jie Min and Lili Ke and Haiwei Chen and Kirill L Gerasimov and Denis V Anokhin and Dimitri A Ivanov and Tayebeh Ameri and Andreas Osvet and Diana K Susarova and Tobias Unruh and Ning Li and Pavel Troshin and Christoph J Brabec},
doi = {10.1002/aenm.201601204},
issn = {1614-6832},
year = {2017},
date = {2017-02-01},
journal = {ADVANCED ENERGY MATERIALS},
volume = {7},
number = {3},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394708700012b,
title = {Surface-directed molecular assembly of pentacene on aromatic
organophosphonate self-assembled monolayers explored by polarized Raman
spectroscopy},
author = {Sara Yazji and Christian Westermeier and Dominik Weinbrenner and Matthias Sachsenhauser and Kung-Ching Liao and Simon Noever and Paolo Postorino and Jeffrey Schwartz and Gerhard Abstreiter and Bert Nickel and Ilaria Zardo and Anna Cattani-Scholz},
doi = {10.1002/jrs.5007},
issn = {0377-0486},
year = {2017},
date = {2017-02-01},
journal = {JOURNAL OF RAMAN SPECTROSCOPY},
volume = {48},
number = {2},
pages = {235-242},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 81 (2, SI), pp. 346-354, 2017, ISSN: 0928-0707, (Spring Meeting of the European-Materials-Research-Society (E-MRS) / 2nd
Symposium AA on Solution Processing and Properties of Functional Oxide
Thin Films and Nanostructures II, Lille, FRANCE, MAY 02-06, 2016).
@article{ISI:000395031800007b,
title = {Pore size control of block copolymer-templated sol-gel-synthesized
titania films deposited via spray coating},
author = {Bo Su and Volker Koerstgens and Yuan Yao and David Magerl and Lin Song and Ezzeldin Metwalli and Sigrid Bernstorff and Peter Mueller-Buschbaum},
doi = {10.1007/s10971-016-4134-9},
issn = {0928-0707},
year = {2017},
date = {2017-02-01},
journal = {JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY},
volume = {81},
number = {2, SI},
pages = {346-354},
organization = {European Mat Res Soc},
note = {Spring Meeting of the European-Materials-Research-Society (E-MRS) / 2nd
Symposium AA on Solution Processing and Properties of Functional Oxide
Thin Films and Nanostructures II, Lille, FRANCE, MAY 02-06, 2016},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000395774300001b,
title = {Slicing Diamond-A Guide to Deriving sp(3)-Si Allotropes},
author = {Laura-Alice Jantke and Saskia Stegmaier and Antti J Karttunen and Thomas F Fassler},
doi = {10.1002/chem.201603406},
issn = {0947-6539},
year = {2017},
date = {2017-02-01},
journal = {CHEMISTRY-A EUROPEAN JOURNAL},
volume = {23},
number = {12},
pages = {2734-2747},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000396929800001b,
title = {Stability of Odd- Versus Even-Electron Gas-Phase (Quasi)Molecular Ions
Derived from Pyridine-Substituted N- Heterotriangulenes},
author = {Jakob Hitzenberger and Pavlo Dral and Ute Meinhardt and Timothy Clark and Walter Thiel and Milan Kivala and Thomas Drewello},
doi = {10.1002/cplu.201600596},
issn = {2192-6506},
year = {2017},
date = {2017-02-01},
journal = {CHEMPLUSCHEM},
volume = {82},
number = {2},
pages = {163},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000396929800009b,
title = {Stability of Odd- Versus Even-Electron Gas-Phase (Quasi)Molecular Ions
Derived from Pyridine-Substituted N-Heterotriangulenes},
author = {Jakob F Hitzenberger and Pavlo O Dral and Ute Meinhardt and Timothy Clark and Walter Thiel and Milan Kivala and Thomas Drewello},
doi = {10.1002/cplu.201600416},
issn = {2192-6506},
year = {2017},
date = {2017-02-01},
journal = {CHEMPLUSCHEM},
volume = {82},
number = {2},
pages = {204-211},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000395428300002b,
title = {Recent developments in and perspectives on three-coordinate boron
materials: a bright future},
author = {Lei Ji and Stefanie Griesbeck and Todd B Marder},
doi = {10.1039/c6sc04245g},
issn = {2041-6520},
year = {2017},
date = {2017-02-01},
journal = {CHEMICAL SCIENCE},
volume = {8},
number = {2},
pages = {846-863},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000395428300062b,
title = {Sulfur rich electron donors - formation of singlet versus triplet
radical ion pair states featuring different lifetimes in the same
conjugate},
author = {Avishek Saha and Muqing Chen and Marcus Lederer and Axel Kahnt and Xing Lu and Dirk M Guldi},
doi = {10.1039/c6sc03207a},
issn = {2041-6520},
year = {2017},
date = {2017-02-01},
journal = {CHEMICAL SCIENCE},
volume = {8},
number = {2},
pages = {1360-1368},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394080000001b,
title = {)Trinuclear Ruthenium Macrocycles: Toward Supramolecular Water Oxidation
Catalysis in Pure Water},
author = {Valentin Kunz and Marcus Schulze and David Schmidt and Frank Wuerthner},
doi = {10.1021/acsenergylett.6b00560},
issn = {2380-8195},
year = {2017},
date = {2017-02-01},
journal = {ACS ENERGY LETTERS},
volume = {2},
number = {2},
pages = {288-293},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gonzalez, Daniel Mosegui; Schaffer, Christoph J; Proeller, Stephan; Schlipf, Johannes; Song, Lin; Bernstorff, Sigrid; Herzig, Eva M; Mueller-Buschbaum, Peter
@article{ISI:000393355900009b,
title = {Codependence between Crystalline and Photovoltage Evolutions in
P3HT:PCBM Solar Cells Probed with in-Operando GIWAXS},
author = {Daniel Mosegui Gonzalez and Christoph J Schaffer and Stephan Proeller and Johannes Schlipf and Lin Song and Sigrid Bernstorff and Eva M Herzig and Peter Mueller-Buschbaum},
doi = {10.1021/acsami.6b15661},
issn = {1944-8244},
year = {2017},
date = {2017-02-01},
journal = {ACS APPLIED MATERIALS & INTERFACES},
volume = {9},
number = {4},
pages = {3282-3287},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394520200001c,
title = {Perspective: On the active site model in computational catalyst screening},
author = {Karsten Reuter and Craig P Plaisance and Harald Oberhofer and Mie Andersen},
doi = {10.1063/1.4974931},
issn = {0021-9606},
year = {2017},
date = {2017-01-01},
journal = {JOURNAL OF CHEMICAL PHYSICS},
volume = {146},
number = {4},
pages = {040901},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{Demchyshyne1700738c,
title = {Confining metal-halide perovskites in nanoporous thin films},
author = {Stepan Demchyshyn and Janina Melanie Roemer and Heiko Groiß and Herwig Heilbrunner and Christoph Ulbricht and Dogukan Apaydin and Anton Böhm and Uta Rütt and Florian Bertram and Günter Hesser and Markus Clark Scharber and Niyazi Serdar Sariciftci and Bert Nickel and Siegfried Bauer and Eric Daniel G ł and Martin Kaltenbrunner},
doi = {10.1126/sciadv.1700738},
year = {2017},
date = {2017-01-01},
journal = {Science Advances},
volume = {3},
number = {8},
pages = {e1700738},
publisher = {American Association for the Advancement of Science},
abstract = {Controlling the size and shape of semiconducting nanocrystals advances nanoelectronics and photonics. Quantum-confined, inexpensive, solution-derived metal halide perovskites offer narrowband, color-pure emitters as integral parts of next-generation displays and optoelectronic devices. We use nanoporous silicon and alumina thin films as templates for the growth of perovskite nanocrystallites directly within device-relevant architectures without the use of colloidal stabilization. We find significantly blue-shifted photoluminescence emission by reducing the pore size; normally infrared-emitting materials become visibly red, and green-emitting materials become cyan and blue. Confining perovskite nanocrystals within porous oxide thin films drastically increases photoluminescence stability because the templates auspiciously serve as encapsulation. We quantify the template-induced size of the perovskite crystals in nanoporous silicon with microfocus high-energy x-ray depth profiling in transmission geometry, verifying the growth of perovskite nanocrystals throughout the entire thickness of the nanoporous films. Low-voltage electroluminescent diodes with narrow, blue-shifted emission fabricated from nanocrystalline perovskites grown in embedded nanoporous alumina thin films substantiate our general concept for next-generation photonic devices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Controlling the size and shape of semiconducting nanocrystals advances nanoelectronics and photonics. Quantum-confined, inexpensive, solution-derived metal halide perovskites offer narrowband, color-pure emitters as integral parts of next-generation displays and optoelectronic devices. We use nanoporous silicon and alumina thin films as templates for the growth of perovskite nanocrystallites directly within device-relevant architectures without the use of colloidal stabilization. We find significantly blue-shifted photoluminescence emission by reducing the pore size; normally infrared-emitting materials become visibly red, and green-emitting materials become cyan and blue. Confining perovskite nanocrystals within porous oxide thin films drastically increases photoluminescence stability because the templates auspiciously serve as encapsulation. We quantify the template-induced size of the perovskite crystals in nanoporous silicon with microfocus high-energy x-ray depth profiling in transmission geometry, verifying the growth of perovskite nanocrystals throughout the entire thickness of the nanoporous films. Low-voltage electroluminescent diodes with narrow, blue-shifted emission fabricated from nanocrystalline perovskites grown in embedded nanoporous alumina thin films substantiate our general concept for next-generation photonic devices.
@article{ISI:000394577000020c,
title = {Light harvesting enhancement upon incorporating alloy structured
CdSexTe1-x quantum dots in DPP:PC61BM bulk heterojunction solar cells},
author = {Rezvan Soltani and Ali Asghar Katbab and Kerstin Schaumberger and Nicola Gasparini and Christoph J Brabec and Stefanie Rechberger and Erdmann Spiecker and Antoni Gimeno Alabau and Andres Ruland and Avishek Saha and Dirk M Guldi and Vito Sgobba and Tayebeh Ameri},
doi = {10.1039/c6tc04308a},
issn = {2050-7526},
year = {2017},
date = {2017-01-01},
journal = {JOURNAL OF MATERIALS CHEMISTRY C},
volume = {5},
number = {3},
pages = {654-662},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
@article{ISI:000394571800009c,
title = {Black Magic in Gray Titania: Noble-Metal-Free Photocatalytic H-2
Evolution from Hydrogenated Anatase},
author = {Ning Liu and Xuemei Zhou and Nhat Truong Nguyen and Kristina Peters and Florian Zoller and Imgon Hwang and Christopher Schneider and Matthias E Miehlich and Detlef Freitag and Karsten Meyer and Dina Fattakhova-Rohlfing and Patrik Schmuki},
doi = {10.1002/cssc.201601264},
issn = {1864-5631},
year = {2017},
date = {2017-01-01},
journal = {CHEMSUSCHEM},
volume = {10},
number = {1, SI},
pages = {62-67},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
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journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS},
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pages = {114-125},
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title = {Supramolecular frameworks based on [60]fullerene hexakisadducts},
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title = {Dual absorber Fe2O3/WO3 host-guest architectures for improved charge generation and transfer in photoelectrochemical applications},
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title = {[Si-4](4-) and [Si-9](4-) Clusters Crystallized from Liquid Ammonia
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