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Interface Dipole Induced Field‐Effect Passivation for Achieving 21.7% Efficiency and Stable Perovskite Solar Cells
Author(s) -
Wang Fengyou,
Zhang Yuhong,
Yang Meifang,
Han Donglai,
Yang Lili,
Fan Lin,
Sui Yingrui,
Sun Yunfei,
Liu Xiaoyan,
Meng Xiangwei,
Yang Jinghai
Publication year - 2021
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.202008052
Subject(s) - passivation , materials science , energy conversion efficiency , perovskite (structure) , optoelectronics , perovskite solar cell , dipole , field effect , photovoltaic system , hysteresis , chemical physics , chemical engineering , nanotechnology , layer (electronics) , condensed matter physics , chemistry , electrical engineering , physics , organic chemistry , engineering
Organolead halide hybrid perovskite solar cells (PSCs) have become a shining star in the renewable devices field due to the sharp growth of power conversion efficiency; however, interfacial recombination and carrier‐extraction losses at heterointerfaces between the perovskite active layer and the carrier transport layers remain the two main obstacles to further improve the power conversion efficiency. Here, novel field‐effect passivation has been successfully induced to effectively suppress the interfacial recombination and improve interfacial charge transfer by incorporating interfacial polarization via inserting a high work function interlayer between perovskite and holes transport layer. The charge dynamics within the device and the mechanism of the field‐effect passivation are elucidated in detail. The unique interfacial dipoles reinforce the built‐in field and prevent the photogenerated charges from recombining, resulting in power conversion efficiency up to 21.7% with negligible hysteresis. Furthermore, the hydrophobic interlayer also suppresses the perovskite decomposition by preventing the moisture penetration, thereby improving the humidity stability of the PSCs (>91% of the initial power conversion efficiency (PCE) after 30 d in 65 ± 5% humidity). Finally, several promising research perspectives based on field‐effect passivation are also suggested for further conversion efficiency improvements and photovoltaic applications.