J
Johannes P. Seif
Researcher at École Polytechnique Fédérale de Lausanne
Publications - 33
Citations - 2154
Johannes P. Seif is an academic researcher from École Polytechnique Fédérale de Lausanne. The author has contributed to research in topics: Silicon & Crystalline silicon. The author has an hindex of 15, co-authored 30 publications receiving 1776 citations. Previous affiliations of Johannes P. Seif include University of New South Wales & École Normale Supérieure.
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Journal ArticleDOI
Current Losses at the Front of Silicon Heterojunction Solar Cells
Zachary C. Holman,Antoine Descoeudres,L. Barraud,Fernando Zicarelli Fernandez,Johannes P. Seif,S. De Wolf,Christophe Ballif +6 more
TL;DR: In this paper, the current losses due to parasitic absorption in the indium tin oxide (ITO) and amorphous silicon (a-Si:H) layers at the front of silicon heterojunction solar cells are isolated and quantified.
Journal ArticleDOI
Efficient Monolithic Perovskite/Silicon Tandem Solar Cell with Cell Area >1 cm2
Jérémie Werner,Ching Hsun Weng,Arnaud Walter,L. Fesquet,Johannes P. Seif,Stefaan De Wolf,Bjoern Niesen,Christophe Ballif +7 more
TL;DR: A low-temperature process for semitransparent perovskite/crystalline silicon tandem solar cells is presented, yielding efficiencies up to 14.5%, and the effects of varying the intermediate recombination layer and hole transport layer thicknesses on tandem cell photocurrent generation are presented, experimentally and by transfer matrix simulations.
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Improved amorphous/crystalline silicon interface passivation by hydrogen plasma treatment
Antoine Descoeudres,Loris Barraud,Stefaan De Wolf,Benjamin Strahm,D. Lachenal,C. Guerin,Zachary C. Holman,F. Zicarelli,Bénédicte Demaurex,Johannes P. Seif,Jakub Holovsky,Christophe Ballif +11 more
TL;DR: In this article, H2 plasma treatments are used during film deposition to improve the passivation of the a-Si:H layers, and 4 cm2 heterojunction solar cells were produced with industry compatible processes, yielding open-circuit voltages up to 725 mV and aperture area efficiencies up to 21%.
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Improved Optics in Monolithic Perovskite/Silicon Tandem Solar Cells with a Nanocrystalline Silicon Recombination Junction
Florent Sahli,Brett A. Kamino,Jérémie Werner,Matthias Bräuninger,Bertrand Paviet-Salomon,Loris Barraud,Raphael Monnard,Johannes P. Seif,Andrea Tomasi,Quentin Jeangros,Quentin Jeangros,Aïcha Hessler-Wyser,Stefaan De Wolf,Matthieu Despeisse,Sylvain Nicolay,Bjoern Niesen,Christophe Ballif +16 more
TL;DR: In this article, an improved recombination junction based on nanocrystalline silicon layers was proposed for monolithic perovskite/silicon tandem cells with a planar front side.
Journal ArticleDOI
Amorphous silicon oxide window layers for high-efficiency silicon heterojunction solar cells
Johannes P. Seif,Antoine Descoeudres,Miha Filipič,Franc Smole,Marko Topič,Zachary C. Holman,Stefaan De Wolf,Christophe Ballif +7 more
TL;DR: In this article, the authors use stacks of intrinsic amorphous silicon and amorphus oxide as front intrinsic buffer layers and show that this increases the short-circuit current density by up to 0.43 µm/cm2.