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Improving Performance of Lead‐Free Formamidinium Tin Triiodide Perovskite Solar Cells by Tin Source Purification
Author(s) -
Gu Feidan,
Ye Senyun,
Zhao Ziran,
Rao Haixia,
Liu Zhiwei,
Bian Zuqiang,
Huang Chunhui
Publication year - 2018
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800136
Subject(s) - tin , triiodide , formamidinium , energy conversion efficiency , materials science , perovskite (structure) , lead (geology) , chemical engineering , inorganic chemistry , chemistry , metallurgy , optoelectronics , crystallography , electrode , dye sensitized solar cell , engineering , geomorphology , electrolyte , geology
Lead (Pb)‐free tin (Sn)‐based perovskite solar cells (PSCs) have been recognized as one of the solutions to the toxicity of Pb and drawn considerable attention. However, Sn 4+ caused by oxidation or incomplete reduction during synthesis severely deteriorates the device performance. Herein, the authors firstly reveal that the addition of Sn powder into the FASnI 3 (FANH 2 CHNH 2 + ) precursor solution prepared from SnI 2 with 99% purity leads to great improvement of the device performance with a maximum power conversion efficiency (PCE) of 6.75%, which is, to the best of their knowledge, the highest efficiency among those of the FASnI 3 ‐based PSCs with SnF 2 as the only additive, comparable to and even higher than the device fabricated from SnI 2 with a high purity of 99.999%.