Stable Lead‐Free Tin Halide Perovskite with Operational Stability >1200 h by Suppressing Tin(II) Oxidation. (7th June 2022)

• Record Type: Journal Article
• Authors: Zhang, Qinggang; Liu, Shiqiang; He, Mengda; Zheng, Weilin; Wan, Qun; Liu, Mingming; Liao, Xinrong; Zhan, Wenji; Yuan, Changwei; Liu, Jinyu; Xie, Haijiao; Guo, Xiaojun; Kong, Long; Li, Liang
• Is Part Of: Angewandte Chemie. Volume 134:Number 30(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-07
• Subjects: Cs4SnBr6 -- F Doping -- Lead-Free Perovskites -- Oxidation Stability -- Tin; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202205463
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Sn‐based perovskites are the most promising alternative materials for Pb‐based perovskites to address the toxicity problem of lead. However, the development of Sn II ‐based perovskites has been hindered by their extreme instability. Here, we synthesized efficient and stable lead‐free Cs4 SnBr6 perovskite by using SnF2 as tin source instead of easily oxidized SnBr2 . The SnF2 configures a fluorine‐rich environment, which can not only suppress the oxidation of Sn 2+ in the synthesis, but also construct chemically stable Sn−F coordination to hinder the electron transfer from Sn 2+ to oxygen within the long‐term operation process. The SnF2 ‐derived Cs4 SnBr6 perovskite shows a high photoluminescence quantum yield of 62.8 %, and excellent stability against oxygen, moisture, and light radiation for 1200 h, representing one of the most stable lead‐free perovskites. The results pave a new pathway to enhance the optical properties and stability of lead‐free perovskite for high‐performance light emitters. Abstract : Ultra‐stable all‐inorganic lead‐free Cs4 SnBr6 perovskites were obtained by using SnF2 as tin source. The doping of F ions can significantly suppress the oxidation of Sn 2+ to Sn 4+ in Cs4 SnBr6 perovskites, thus achieving excellent stability against oxygen, moisture and light irradiation for 1200 h.