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Multiple‐Trapping Model for the Charge Recombination Dynamics in Mesoporous‐Structured Perovskite Solar Cells
Author(s) -
Wang HaoYi,
Wang Yi,
Hao MingYang,
Qin Yujun,
Fu LiMin,
Guo ZhiXin,
Ai XiCheng,
Zhang JianPing
Publication year - 2017
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.201701780
Subject(s) - perovskite (structure) , photoelectric effect , mesoporous material , photovoltaic system , charge carrier , trapping , recombination , charge (physics) , materials science , chemical physics , optoelectronics , physics , chemistry , electrical engineering , ecology , biochemistry , quantum mechanics , gene , biology , crystallography , engineering , catalysis
Abstract The photovoltaic performance of organic–inorganic hybrid perovskite solar cells has reached a bottleneck after rapid development in last few years. Further breakthrough in this field requires deeper understanding of the underlying mechanism of the photoelectric conversion process in the device, especially the dynamics of charge‐carrier recombination. Originating from dye‐sensitized solar cells (DSSCs), mesoporous‐structured perovskite solar cells (MPSCs) have shown many similarities to DSSCs with respect to their photoelectric dynamics. Herein, by applying the multiple‐trapping model of the charge‐recombination dynamic process for DSSCs in MPSCs, with rational modification, a novel physical model is proposed to describe the dynamics of charge recombination in MPSCs that exhibits good agreement with experimental data. Accordingly, the perovskite‐ and TiO 2 ‐dominating charge‐recombination processes are assigned and their relationships with the trap‐state distribution are also discussed. An optimal balance between these two dynamic processes is required to improve the performance of mesoporous‐structured perovskite devices.