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Achieving 20% Efficiency for Low‐Temperature‐Processed Inverted Perovskite Solar Cells
Author(s) -
Yang Daobin,
Sano Takeshi,
Yaguchi Yuma,
Sun He,
Sasabe Hisahiro,
Kido Junji
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201807556
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , work function , diphenylamine , optoelectronics , chemical engineering , nanotechnology , layer (electronics) , metallurgy , engineering
Low‐temperature‐processed inverted perovskite solar cells (PVSCs) attract increasing attention because they can be fabricated on both rigid and flexible substrates. For these devices, hole‐transporting layers (HTLs) play an important role in achieving efficient and stable inverted PVSCs by adjusting the anodic work function, hole extraction, and interfacial charge recombination. Here, the use of a low‐temperature (≤150 °C) solution‐processed ultrathin film of poly[(9,9‐dioctyl‐fluorenyl‐2,7‐diyl)‐ co ‐(4,4′‐( N ‐(4‐secbutylphenyl) diphenylamine)] (TFB) is reported as an HTL in one‐step‐processed CH 3 NH 3 PbI 3 (MAPbI 3 )‐based inverted PVSCs. The fabricated device exhibits power conversion efficiency (PCE) as high as 20.2% when measured under AM 1.5 G illumination. This PCE makes them one of the MAPbI 3 ‐based inverted PVSCs that have the highest efficiency reported to date. Moreover, this inverted PVSC also shows good stability, which can retain 90% of its original efficiency after 30 days of storage in ambient air.