A Cation‐Exchange Approach for the Fabrication of Efficient Methylammonium Tin Iodide Perovskite Solar Cells

Fengzhu Li(Chinese Academy of Sciences), Chaoshen Zhang(University of Chinese Academy of Sciences), Jin‐Hua Huang(Chinese Academy of Sciences), Haochen Fan(Chinese Academy of Sciences), Huijia Wang(Chinese Academy of Sciences), Pengcheng Wang(Chinese Academy of Sciences), Chuanlang Zhan(Chinese Academy of Sciences), Cai‐Ming Liu(Chinese Academy of Sciences), Xiangjun Li(University of Chinese Academy of Sciences), Lian‐Ming Yang(Chinese Academy of Sciences), Yanlin Song(Chinese Academy of Sciences), Ke‐Jian Jiang(Chinese Academy of Sciences)
Angewandte Chemie International Edition
March 19, 2019
10.1002/anie.201902418
Cited by 201

Abstract

Abstract 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.

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