Improving Performance of Lead-Free Formamidinium Tin Triiodide Perovskite Solar Cells by Tin Source Purification
Improving Performance of Lead-Free Formamidinium Tin Triiodide Perovskite Solar Cells by Tin Source Purification
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DOI：
10.1002/solr.201800136
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发表时间：
2018-10-01
期刊：
影响因子：
7.9
通讯作者：
Huang, Chunhui
中科院分区：
文献类型：
--
作者：
Gu, Feidan;Ye, Senyun;Huang, Chunhui
无铅锡基钙钛矿太阳能电池是解决铅毒性的有效途径之一，受到广泛关注。然而，在合成过程中由氧化或不完全还原引起的Sn 4+严重劣化器件性能。在此，作者首次揭示了将Sn粉末添加到由纯度为99%的SnI2制备的FASnI（3）（FANH（2）CHNH（2）（+））前体溶液中导致器件性能的极大改善，最大功率转换效率（PCE）为6.75%，据他们所知，在使用SnF2作为唯一添加剂的基于FASnI（3）的PSC中，效率最高，与由具有99.999%的高纯度的SnI2制造的器件相当，甚至更高。
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, Sn4+ 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 SnI2 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 SnF2 as the only additive, comparable to and even higher than the device fabricated from SnI2 with a high purity of 99.999%.