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Planar‐Structure Perovskite Solar Cells with Efficiency beyond 21%
Author(s) -
Jiang Qi,
Chu Zema,
Wang Pengyang,
Yang Xiaolei,
Liu Heng,
Wang Ye,
Yin Zhigang,
Wu Jinliang,
Zhang Xingwang,
You Jingbi
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201703852
Subject(s) - materials science , perovskite (structure) , hysteresis , planar , energy conversion efficiency , stoichiometry , mesoporous material , layer (electronics) , optoelectronics , chemical engineering , nanotechnology , condensed matter physics , chemistry , computer science , biochemistry , physics , computer graphics (images) , engineering , catalysis
Low temperature solution processed planar‐structure perovskite solar cells gain great attention recently, while their power conversions are still lower than that of high temperature mesoporous counterpart. Previous reports are mainly focused on perovskite morphology control and interface engineering to improve performance. Here, this study systematically investigates the effect of precise stoichiometry, especially the PbI 2 contents on device performance including efficiency, hysteresis and stability. This study finds that a moderate residual of PbI 2 can deliver stable and high efficiency of solar cells without hysteresis, while too much residual PbI 2 will lead to serious hysteresis and poor transit stability. Solar cells with the efficiencies of 21.6% in small size (0.0737 cm 2 ) and 20.1% in large size (1 cm 2 ) with moderate residual PbI 2 in perovskite layer are obtained. The certificated efficiency for small size shows the efficiency of 20.9%, which is the highest efficiency ever recorded in planar‐structure perovskite solar cells, showing the planar‐structure perovskite solar cells are very promising.