Publications

@article{Xu2023,

title = {Doping of Mesoscopic Charge Extraction Layers Enables the Design of Long-Time Stable Organic Solar Cells},

author = {Junyi Xu and Junsheng Luo and Kirill Gubanov and Anastasiia Barabash and Rainer H Fink and Thomas Heumüller and Christoph J Brabec},

doi = {10.1021/acsenergylett.3c02087},

year  = {2023},

date = {2023-12-04},

journal = {ACS Energy Letters},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Alam2023,

title = {Thermally-Induced Degradation in PM6:Y6-Based Bulk Heterojunction Organic Solar Cells},

author = {Shahidul Alam and Haya Aldosari and Christopher E Petoukhoff and Tomas Vary and Wejdan Althobaiti and Maryam Alqurashi and Hua Tang and Jafar I Khan and Vojtech Nadazdy and Peter Müller-Buschbaum and and Gregory C Welch and Frederick Laquai},

doi = {10.1002/adfm.202308076},

year  = {2023},

date = {2023-10-27},

journal = {Advanced Functional Materials},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Jiang2023b,

title = {Operando study of the influence of small molecule acceptors on the morphology induced device degradation of organic solar cells with different degrees of π–π stacking},

author = {Xinyu Jiang and Alexander J Gillett and Tianle Zheng and Xin Song and Julian E Heger and Kun Sun and Lukas V Spanier and Renjun Guo and Suzhe Liang and Sigrid Bernstorff and Peter Müller-Buschbaum and},

doi = {10.1039/D3EE02527F},

year  = {2023},

date = {2023-10-18},

journal = {Energy & Environmental Science},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Song2023,

title = {Film-formation dynamics coordinated by intermediate state engineering enables efficient thickness-insensitive organic solar cells},

author = {Xin Song and Hao Xu and Xinyu Jiang and Shengzheng Gao and Xinjie Zhou and Shanlei Xu and Junjun Li and Jian Yu and Wenzhu Liu and Weiguo Zhu and Peter Müller-Buschbaum},

doi = {10.1039/D3EE01320K},

year  = {2023},

date = {2023-06-20},

journal = {Energy & Environmental Science},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ma2023,

title = {Revealing the Underlying Solvent Effect on Film Morphology in High-Efficiency Organic Solar Cells by Combined Ex-situ and In-situ Observations},

author = {Ruijie Ma and Xinyu Jiang and Jiehao Fu and Tao Zhu and Cenqi Yan and Kexin Wu and Peter Müller-Buschbaum and Gang Li},

doi = {10.1039/D3EE00294B},

year  = {2023},

date = {2023-04-07},

journal = {Energy & Environmental Science},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Reb2023,

title = {Space- and Post-Flight Characterizations of Perovskite and Organic Solar Cells},

author = {Lennart K. Reb and Michael Böhmer and Benjamin Predeschly and Sebastian Grott and Christian L. Weindl and Goran I. Ivandekic and Renjun Guo and Lukas V. Spanier and Matthias Schwartzkopf and Andrei Chumakov and Christoph Dreißigacker and Roman Gernhäuser and Stephan V. Roth and Andreas Meyer and Peter Müller-Buschbaum},

doi = {10.1002/solr.202300043},

year  = {2023},

date = {2023-02-09},

journal = {RRL Solar},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hart2023,

title = {Triplet-triplet annihilation reduces non-radiative voltage losses in organic solar cells},

author = {Lucy J. F. Hart and Jeannine Grüne and Wei Liu and Tsz-ki Lau and Joel Luke and Yi-Chun Chin and Xinyu Jiang and Huotian Zhang and Daniel J. C. Sowood and Darcy L. M. Unson and Ji-Seon Kim and Xinhui Lu and Yingping Zou and Feng Gao and Andreas Sperlich and Vladimir Dyakonov and Jun Yuan and Alexander J. Gillett},

doi = {10.48550/arXiv.2301.02112},

year  = {2023},

date = {2023-01-05},

journal = {arxiv},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wang2023b,

title = {Control of the Crystallization and Phase Separation Kinetics in Sequential Blade-Coated Organic Solar Cells by Optimizing the Upper Layer Processing Solvent},

author = {Yilin Wang and Jingwei Xue and Huaying Zhong and Christopher R. Everett and Xinyu Jiang and Manuel A. Reus and Andrei Chumakov and Stephan V. Roth and Michael A. Adedeji and Ncedo Jili and Ke Zhou and Guanghao Lu and Zheng Tang and Genene Tessema Mola and Peter Müller-Buschbaum and Wei Ma},

doi = {10.1002/aenm.202203496},

year  = {2023},

date = {2023-01-01},

journal = {Advanced Energy Materials},

volume = {13},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhao2020,

title = {Hot Hydrocarbon-Solvent Slot-Die Coating Enables High-Efficiency Organic Solar Cells with Temperature-Dependent Aggregation Behavior},

author = {Heng Zhao and Hafiz Bilal Naveed and Baojun Lin and Xiaobo Zhou and Jian Yuan and Ke Zhou and Hongbo Wu and Renjun Guo and Manuel A Scheel and Andrei Chumakov and Stephan V Roth and Zheng Tang and Peter Müller-Buschbaum and Wei Ma},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202002302},

doi = {https://doi.org/10.1002/adma.202002302},

year  = {2020},

date = {2020-01-01},

journal = {Advanced Materials},

volume = {32},

number = {39},

pages = {2002302},

abstract = {Abstract Organic solar cells (OSCs) have made rapid progress in terms of their development as a sustainable energy source. However, record-breaking devices have not shown compatibility with large-scale production via solution processing in particular due to the use of halogenated environment-threatening solvents. Here, slot-die fabrication with processing involving hydrocarbon-based solvents is used to realize highly efficient and environmentally friendly OSCs. Highly compatible slot-die coating with roll-to-roll processing using halogenated (chlorobenzene (CB)) and hydrocarbon solvents (1,2,4-trimethylbenzene (TMB) and ortho-xylene (o-XY)) is used to fabricate photoactive films. Controlled solution and substrate temperatures enable similar aggregation states in the solution and similar kinetics processes during film formation. The optimized blend film nanostructures for different solvents in the highly efficient PM6:Y6 blend is adopted to show a similar morphology, which results in device efficiencies of 15.2%, 15.4%, and 15.6% for CB, TMB, and o-XY solvents. This approach is successfully extended to other donor–acceptor combinations to demonstrate the excellent universality of this method. The results combine a method to optimize the aggregation state and film formation kinetics with the fabrication of OSCs with environmentally friendly solvents by slot-die coating, which is a critical finding for the future development of OSCs in terms of their scalable production and high-performance.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wienhold2020a,

title = {Following in Operando the Structure Evolution-Induced Degradation in Printed Organic Solar Cells with Nonfullerene Small Molecule Acceptor},

author = {Kerstin S Wienhold and Wei Chen and Shanshan Yin and Renjun Guo and Matthias Schwartzkopf and Stephan V Roth and Peter Müller-Buschbaum},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.202000251},

doi = {https://doi.org/10.1002/solr.202000251},

year  = {2020},

date = {2020-01-01},

journal = {Solar RRL},

volume = {4},

number = {9},

pages = {2000251},

abstract = {Understanding the degradation mechanisms of printed bulk-heterojunction (BHJ) organic solar cells during operation is essential to achieve long-term stability and realize real-world applications of organic photovoltaics. Herein, the degradation of printed organic solar cells based on the conjugated benzodithiophene polymer PBDB-T-SF and the nonfullerene small molecule acceptor IT-4F with 0.25 vol% 1,8-diiodooctane (DIO) solvent additive is studied in operando for two different donor:acceptor ratios. The inner nano-morphology is analyzed with grazing incidence small angle X-ray scattering (GISAXS), and current–voltage (I–V) characteristics are probed simultaneously. Irrespective of the mixing ratio, degradation occurs by the same degradation mechanism. A decrease in the short-circuit current density (JSC) is identified to be the determining factor for the decline of the power conversion efficiency. The decrease in JSC is induced by a reduction of the relative interface area between the conjugated polymer and the small molecule acceptor in the BHJ structure, resembling the morphological degradation of the active layer.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Xu2023,

title = {Doping of Mesoscopic Charge Extraction Layers Enables the Design of Long-Time Stable Organic Solar Cells},

author = {Junyi Xu and Junsheng Luo and Kirill Gubanov and Anastasiia Barabash and Rainer H Fink and Thomas Heumüller and Christoph J Brabec},

doi = {10.1021/acsenergylett.3c02087},

year  = {2023},

date = {2023-12-04},

journal = {ACS Energy Letters},

keywords = {organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Alam2023,

title = {Thermally-Induced Degradation in PM6:Y6-Based Bulk Heterojunction Organic Solar Cells},

author = {Shahidul Alam and Haya Aldosari and Christopher E Petoukhoff and Tomas Vary and Wejdan Althobaiti and Maryam Alqurashi and Hua Tang and Jafar I Khan and Vojtech Nadazdy and Peter Müller-Buschbaum and and Gregory C Welch and Frederick Laquai},

doi = {10.1002/adfm.202308076},

year  = {2023},

date = {2023-10-27},

journal = {Advanced Functional Materials},

keywords = {heterojunction, organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Jiang2023b,

title = {Operando study of the influence of small molecule acceptors on the morphology induced device degradation of organic solar cells with different degrees of π–π stacking},

author = {Xinyu Jiang and Alexander J Gillett and Tianle Zheng and Xin Song and Julian E Heger and Kun Sun and Lukas V Spanier and Renjun Guo and Suzhe Liang and Sigrid Bernstorff and Peter Müller-Buschbaum and},

doi = {10.1039/D3EE02527F},

year  = {2023},

date = {2023-10-18},

journal = {Energy & Environmental Science},

keywords = {organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Song2023,

title = {Film-formation dynamics coordinated by intermediate state engineering enables efficient thickness-insensitive organic solar cells},

author = {Xin Song and Hao Xu and Xinyu Jiang and Shengzheng Gao and Xinjie Zhou and Shanlei Xu and Junjun Li and Jian Yu and Wenzhu Liu and Weiguo Zhu and Peter Müller-Buschbaum},

doi = {10.1039/D3EE01320K},

year  = {2023},

date = {2023-06-20},

journal = {Energy & Environmental Science},

keywords = {film-formation dynamics, intermediate state engineering, organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Ma2023,

title = {Revealing the Underlying Solvent Effect on Film Morphology in High-Efficiency Organic Solar Cells by Combined Ex-situ and In-situ Observations},

author = {Ruijie Ma and Xinyu Jiang and Jiehao Fu and Tao Zhu and Cenqi Yan and Kexin Wu and Peter Müller-Buschbaum and Gang Li},

doi = {10.1039/D3EE00294B},

year  = {2023},

date = {2023-04-07},

journal = {Energy & Environmental Science},

keywords = {organic solar cells, solvent effect},

pubstate = {published},

tppubtype = {article}

}

@article{Reb2023,

title = {Space- and Post-Flight Characterizations of Perovskite and Organic Solar Cells},

author = {Lennart K. Reb and Michael Böhmer and Benjamin Predeschly and Sebastian Grott and Christian L. Weindl and Goran I. Ivandekic and Renjun Guo and Lukas V. Spanier and Matthias Schwartzkopf and Andrei Chumakov and Christoph Dreißigacker and Roman Gernhäuser and Stephan V. Roth and Andreas Meyer and Peter Müller-Buschbaum},

doi = {10.1002/solr.202300043},

year  = {2023},

date = {2023-02-09},

journal = {RRL Solar},

keywords = {organic solar cells, perovskite},

pubstate = {published},

tppubtype = {article}

}

@article{Hart2023,

title = {Triplet-triplet annihilation reduces non-radiative voltage losses in organic solar cells},

author = {Lucy J. F. Hart and Jeannine Grüne and Wei Liu and Tsz-ki Lau and Joel Luke and Yi-Chun Chin and Xinyu Jiang and Huotian Zhang and Daniel J. C. Sowood and Darcy L. M. Unson and Ji-Seon Kim and Xinhui Lu and Yingping Zou and Feng Gao and Andreas Sperlich and Vladimir Dyakonov and Jun Yuan and Alexander J. Gillett},

doi = {10.48550/arXiv.2301.02112},

year  = {2023},

date = {2023-01-05},

journal = {arxiv},

keywords = {organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Wang2023b,

title = {Control of the Crystallization and Phase Separation Kinetics in Sequential Blade-Coated Organic Solar Cells by Optimizing the Upper Layer Processing Solvent},

author = {Yilin Wang and Jingwei Xue and Huaying Zhong and Christopher R. Everett and Xinyu Jiang and Manuel A. Reus and Andrei Chumakov and Stephan V. Roth and Michael A. Adedeji and Ncedo Jili and Ke Zhou and Guanghao Lu and Zheng Tang and Genene Tessema Mola and Peter Müller-Buschbaum and Wei Ma},

doi = {10.1002/aenm.202203496},

year  = {2023},

date = {2023-01-01},

journal = {Advanced Energy Materials},

volume = {13},

keywords = {blade-coated, crystallization, organic solar cells},

pubstate = {published},

tppubtype = {article}

}

@article{Zhao2020,

title = {Hot Hydrocarbon-Solvent Slot-Die Coating Enables High-Efficiency Organic Solar Cells with Temperature-Dependent Aggregation Behavior},

author = {Heng Zhao and Hafiz Bilal Naveed and Baojun Lin and Xiaobo Zhou and Jian Yuan and Ke Zhou and Hongbo Wu and Renjun Guo and Manuel A Scheel and Andrei Chumakov and Stephan V Roth and Zheng Tang and Peter Müller-Buschbaum and Wei Ma},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202002302},

doi = {https://doi.org/10.1002/adma.202002302},

year  = {2020},

date = {2020-01-01},

journal = {Advanced Materials},

volume = {32},

number = {39},

pages = {2002302},

abstract = {Abstract Organic solar cells (OSCs) have made rapid progress in terms of their development as a sustainable energy source. However, record-breaking devices have not shown compatibility with large-scale production via solution processing in particular due to the use of halogenated environment-threatening solvents. Here, slot-die fabrication with processing involving hydrocarbon-based solvents is used to realize highly efficient and environmentally friendly OSCs. Highly compatible slot-die coating with roll-to-roll processing using halogenated (chlorobenzene (CB)) and hydrocarbon solvents (1,2,4-trimethylbenzene (TMB) and ortho-xylene (o-XY)) is used to fabricate photoactive films. Controlled solution and substrate temperatures enable similar aggregation states in the solution and similar kinetics processes during film formation. The optimized blend film nanostructures for different solvents in the highly efficient PM6:Y6 blend is adopted to show a similar morphology, which results in device efficiencies of 15.2%, 15.4%, and 15.6% for CB, TMB, and o-XY solvents. This approach is successfully extended to other donor–acceptor combinations to demonstrate the excellent universality of this method. The results combine a method to optimize the aggregation state and film formation kinetics with the fabrication of OSCs with environmentally friendly solvents by slot-die coating, which is a critical finding for the future development of OSCs in terms of their scalable production and high-performance.},

keywords = {hot slot-die coating, hydrocarbon solvents, organic solar cells, temperature-dependent aggregation},

pubstate = {published},

tppubtype = {article}

}

@article{Wienhold2020a,

title = {Following in Operando the Structure Evolution-Induced Degradation in Printed Organic Solar Cells with Nonfullerene Small Molecule Acceptor},

author = {Kerstin S Wienhold and Wei Chen and Shanshan Yin and Renjun Guo and Matthias Schwartzkopf and Stephan V Roth and Peter Müller-Buschbaum},

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.202000251},

doi = {https://doi.org/10.1002/solr.202000251},

year  = {2020},

date = {2020-01-01},

journal = {Solar RRL},

volume = {4},

number = {9},

pages = {2000251},

abstract = {Understanding the degradation mechanisms of printed bulk-heterojunction (BHJ) organic solar cells during operation is essential to achieve long-term stability and realize real-world applications of organic photovoltaics. Herein, the degradation of printed organic solar cells based on the conjugated benzodithiophene polymer PBDB-T-SF and the nonfullerene small molecule acceptor IT-4F with 0.25 vol% 1,8-diiodooctane (DIO) solvent additive is studied in operando for two different donor:acceptor ratios. The inner nano-morphology is analyzed with grazing incidence small angle X-ray scattering (GISAXS), and current–voltage (I–V) characteristics are probed simultaneously. Irrespective of the mixing ratio, degradation occurs by the same degradation mechanism. A decrease in the short-circuit current density (JSC) is identified to be the determining factor for the decline of the power conversion efficiency. The decrease in JSC is induced by a reduction of the relative interface area between the conjugated polymer and the small molecule acceptor in the BHJ structure, resembling the morphological degradation of the active layer.},

keywords = {degradation mechanisms, meniscus-guided slot-die coatings, organic solar cells, short-circuit currents},

pubstate = {published},

tppubtype = {article}

}