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Interfacial Residual Stress Relaxation in Perovskite Solar Cells with Improved Stability
Author(s) -
Wang Hao,
Zhu Cheng,
Liu Lang,
Ma Sai,
Liu Pengfei,
Wu Jiafeng,
Shi Congbo,
Du Qin,
Hao Yanmin,
Xiang Sisi,
Chen Haining,
Chen Pengwan,
Bai Yang,
Zhou Huanping,
Li Yujing,
Chen Qi
Publication year - 2019
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.201904408
Subject(s) - materials science , residual stress , crystallite , perovskite (structure) , composite material , thin film , thermal stability , stress relaxation , stress (linguistics) , photovoltaic system , optoelectronics , chemical engineering , nanotechnology , creep , metallurgy , linguistics , philosophy , engineering , ecology , biology
To improve the photovoltaic performance (both efficiency and stability) in hybrid organic–inorganic halide perovskite solar cells, perovskite lattice distortion is investigated with regards to residual stress (and strain) in the polycrystalline thin films. It is revealed that residual stress is concentrated at the surface of the as‐prepared film, and an efficient method is further developed to release this interfacial stress by A site cation alloying. This results in lattice reconstruction at the surface of polycrystalline thin films, which in turn results in low elastic modulus. Thus, a “bone‐joint” configuration is constructed within the interface between the absorber and the carrier transport layer, which improves device performance substantially. The resultant photovoltaic devices exhibit an efficiency of 21.48% with good humidity stability and improved resistance against thermal cycling.