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High‐Efficiency Perovskite Solar Cells with Imidazolium‐Based Ionic Liquid for Surface Passivation and Charge Transport
Author(s) -
Zhu Xuejie,
Du Minyong,
Feng Jiangshan,
Wang Hui,
Xu Zhuo,
Wang Likun,
Zuo Shengnan,
Wang Chenyu,
Wang Ziyu,
Zhang Cong,
Ren Xiaodong,
Priya Shashank,
Yang Dong,
Liu Shengzhong Frank
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202010987
Subject(s) - formamidinium , passivation , perovskite (structure) , ionic liquid , materials science , iodide , hexafluorophosphate , perovskite solar cell , chemical engineering , photovoltaics , inorganic chemistry , ionic bonding , chemistry , layer (electronics) , chemical physics , ion , nanotechnology , photovoltaic system , organic chemistry , catalysis , ecology , engineering , biology
Surface defects have been a key constraint for perovskite photovoltaics. Herein, 1,3‐dimethyl‐3‐imidazolium hexafluorophosphate (DMIMPF 6 ) ionic liquid (IL) is adopted to passivate the surface of a formamidinium‐cesium lead iodide perovskite (Cs 0.08 FA 0.92 PbI 3 ) and also reduce the energy barrier between the perovskite and hole transport layer. Theoretical simulations and experimental results demonstrate that Pb‐cluster and Pb‐I antisite defects can be effectively passivated by [DMIM] + bonding with the Pb 2+ ion on the perovskite surface, leading to significantly suppressed non‐radiative recombination. As a result, the solar cell efficiency was increased to 23.25 % from 21.09 %. Meanwhile, the DMIMPF 6 ‐treated perovskite device demonstrated long‐term stability because the hydrophobic DMIMPF 6 layer blocked moisture permeation.