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Improved Optics in Monolithic Perovskite/Silicon Tandem Solar Cells with a Nanocrystalline Silicon Recombination Junction
Author(s) -
Sahli Florent,
Kamino Brett A.,
Werner Jérémie,
Bräuninger Matthias,
PavietSalomon Bertrand,
Barraud Loris,
Monnard Raphaël,
Seif Johannes Peter,
Tomasi Andrea,
Jeangros Quentin,
HesslerWyser Aïcha,
Wolf Stefaan,
Despeisse Matthieu,
Nicolay Sylvain,
Niesen Bjoern,
Ballif Christophe
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701609
Subject(s) - materials science , optoelectronics , tandem , silicon , perovskite (structure) , photocurrent , energy conversion efficiency , solar cell , nanocrystalline material , photovoltaics , nanotechnology , photovoltaic system , composite material , electrical engineering , chemical engineering , engineering
Perovskite/silicon tandem solar cells are increasingly recognized as promising candidates for next‐generation photovoltaics with performance beyond the single‐junction limit at potentially low production costs. Current designs for monolithic tandems rely on transparent conductive oxides as an intermediate recombination layer, which lead to optical losses and reduced shunt resistance. An improved recombination junction based on nanocrystalline silicon layers to mitigate these losses is demonstrated. When employed in monolithic perovskite/silicon heterojunction tandem cells with a planar front side, this junction is found to increase the bottom cell photocurrent by more than 1 mA cm −2 . In combination with a cesium‐based perovskite top cell, this leads to tandem cell power‐conversion efficiencies of up to 22.7% obtained from J – V measurements and steady‐state efficiencies of up to 22.0% during maximum power point tracking. Thanks to its low lateral conductivity, the nanocrystalline silicon recombination junction enables upscaling of monolithic perovskite/silicon heterojunction tandem cells, resulting in a 12.96 cm 2 monolithic tandem cell with a steady‐state efficiency of 18%.