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A Cation‐Exchange Approach for the Fabrication of Efficient Methylammonium Tin Iodide Perovskite Solar Cells
Author(s) -
Li Fengzhu,
Zhang Chaoshen,
Huang JinHua,
Fan Haochen,
Wang Huijia,
Wang Pengcheng,
Zhan Chuanlang,
Liu CaiMing,
Li Xiangjun,
Yang LianMing,
Song Yanlin,
Jiang KeJian
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201902418
Subject(s) - iodide , tin , perovskite (structure) , energy conversion efficiency , materials science , halide , mesoporous material , inorganic chemistry , crystallization , chemical engineering , fabrication , chemistry , catalysis , metallurgy , optoelectronics , organic chemistry , medicine , alternative medicine , pathology , engineering
Tin‐based halide perovskite materials have been successfully employed in lead‐free perovskite solar cells, but the overall power conversion efficiencies (PCEs) have been limited by the high carrier concentration from the facile oxidation of Sn 2+ to Sn 4+ . Now a chemical route is developed for fabrication of high‐quality methylammonium tin iodide perovskite (MASnI 3 ) films: hydrazinium tin iodide (HASnI 3 ) perovskite film is first solution‐deposited using presursors hydrazinium iodide (HAI) and tin iodide (SnI 2 ), and then transformed into MASnI 3 via a cation displacement approach. With the two‐step process, a dense and uniform MASnI 3 film is obtained with large grain sizes and high crystallization. Detrimental oxidation is suppressed by the hydrazine released from the film during the transformation. With the MASnI 3 as light harvester, mesoporous perovskite solar cells were prepared, and a maximum power conversion efficiency (PCE) of 7.13 % is delivered with good reproducibility.