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High‐Efficiency and UV‐Stable Planar Perovskite Solar Cells Using a Low‐Temperature, Solution‐Processed Electron‐Transport Layer
Author(s) -
Liu Cheng,
Yang Yi,
Ding Yong,
Xu Jia,
Liu Xiaolong,
Zhang Bing,
Yao Jianxi,
Hayat Tasawar,
Alsaedi Ahmed,
Dai Songyuan
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201702248
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , cathode , doping , optoelectronics , layer (electronics) , halide , electron , chemical engineering , hysteresis , photochemistry , inorganic chemistry , nanotechnology , chemistry , physics , quantum mechanics , engineering
Efficient metal‐halide perovskite solar cells (PSCs) with a regular structure typically use high‐temperature‐processed TiO 2 electron‐transport layers (ETLs), which suffer from high electron recombination and inherent UV instability. Herein, we present low‐temperature solution‐processed lithium bis(trifluoromethanesulfonyl)imide (Li‐TFSI)‐doped C 60 (Li‐C 60 ) ETLs for high‐efficiency and UV‐stable planar PSCs with an n‐i‐p architecture. We found that simple Li‐TFSI doping ensured a better energy match between the active layer and the cathode, considerably enhanced the electron mobility of the ETL, and even improved CH 3 NH 3 PbI 3 crystallization finally to increase the power conversion efficiency (PCE) from 15.3 to 17.8 % with a minor hysteresis effect. Moreover, it was demonstrated that replacing TiO 2 with Li‐C 60 resulted in PSCs that were much more stable under UV light under an air atmosphere with almost no degradation after 3000 h under a nitrogen atmosphere.