S
Stephan Buecheler
Researcher at Swiss Federal Laboratories for Materials Science and Technology
Publications - 138
Citations - 8802
Stephan Buecheler is an academic researcher from Swiss Federal Laboratories for Materials Science and Technology. The author has contributed to research in topics: Copper indium gallium selenide solar cells & Thin film. The author has an hindex of 37, co-authored 138 publications receiving 6994 citations. Previous affiliations of Stephan Buecheler include École Polytechnique Fédérale de Lausanne.
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Journal ArticleDOI
Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells
Adrian Chirila,Patrick Reinhard,Fabian Pianezzi,P. Bloesch,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Debora Keller,Christina Gretener,Harald Hagendorfer,Dominik Jaeger,Rolf Erni,Shiro Nishiwaki,Stephan Buecheler,Ayodhya N. Tiwari +14 more
TL;DR: A new sequential post-deposition treatment of the CIGS layer with sodium and potassium fluoride is presented that enables fabrication of flexible photovoltaic devices with a remarkable conversion efficiency due to modified interface properties and mitigation of optical losses in the CdS buffer layer.
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Planar perovskite solar cells with long-term stability using ionic liquid additives
Sai Bai,Sai Bai,Peimei Da,Cheng Li,Cheng Li,Zhiping Wang,Zhongcheng Yuan,Fan Fu,Maciej Kawecki,Maciej Kawecki,Xianjie Liu,Nobuya Sakai,Jacob Tse-Wei Wang,Sven Huettner,Stephan Buecheler,Mats Fahlman,Feng Gao,Feng Gao,Henry J. Snaith +18 more
TL;DR: Addition of an ionic liquid, BMIMBF4, to metal halide perovskite solar cells improves their efficiency and long-term operation under accelerated aging conditions of high temperature and full-spectrum sunlight.
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Highly efficient Cu(In,Ga)Se2 solar cells grown on flexible polymer films
Adrian Chirila,Stephan Buecheler,Fabian Pianezzi,P. Bloesch,Christina Gretener,Alexander R. Uhl,C.M. Fella,Lukas Kranz,Julian Perrenoud,S. Seyrling,R. Verma,Shiro Nishiwaki,Yaroslav E. Romanyuk,G. Bilger,Ayodhya N. Tiwari +14 more
TL;DR: A strong composition gradient in the absorber layer is identified as the main reason for inferior performance and it is shown that, by adjusting it appropriately, very high efficiencies can be obtained.
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Low-temperature-processed efficient semi-transparent planar perovskite solar cells for bifacial and tandem applications
Fan Fu,Thomas Feurer,Timo Jäger,Enrico Avancini,Benjamin Bissig,Songhak Yoon,Stephan Buecheler,Ayodhya N. Tiwari +7 more
TL;DR: A low-temperature process for efficient semi-transparent planar perovskite solar cells and a hybrid thermal evaporation–spin coating technique is developed to allow the introduction of PCBM in regular device configuration, which facilitates the growth of high-quality absorber, resulting in hysteresis-free devices.
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Unveiling the effects of post-deposition treatment with different alkaline elements on the electronic properties of CIGS thin film solar cells.
Fabian Pianezzi,Patrick Reinhard,Adrian Chirila,Benjamin Bissig,Shiro Nishiwaki,Stephan Buecheler,Ayodhya N. Tiwari +6 more
TL;DR: It is concluded that a model based on a secondary diode at the CIGS/Mo interface can best explain these features such as the position of the N1 signal in admittance spectroscopy and the roll-over of the J-V curve at low temperature.