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
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Department of Electronic Engineering, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Angew Chem Int Ed Engl. 2022 Jul 25;61(30):e202205463. doi: 10.1002/anie.202205463. Epub 2022 Jun 7.
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 -based perovskites has been hindered by their extreme instability. Here, we synthesized efficient and stable lead-free Cs SnBr perovskite by using SnF as tin source instead of easily oxidized SnBr . The SnF configures a fluorine-rich environment, which can not only suppress the oxidation of Sn in the synthesis, but also construct chemically stable Sn-F coordination to hinder the electron transfer from Sn to oxygen within the long-term operation process. The SnF -derived Cs SnBr 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.
锡基钙钛矿是解决铅基钙钛矿毒性问题最有前景的替代材料。然而，锡基钙钛矿的发展因其极端不稳定性而受阻。在此，我们通过使用SnF作为锡源而非易氧化的SnBr合成了高效且稳定的无铅CsSnBr钙钛矿。SnF构建了一个富氟环境，这不仅可以在合成过程中抑制Sn的氧化，还能构建化学稳定的Sn-F配位，以在长期运行过程中阻碍电子从Sn转移到氧。由SnF衍生的CsSnBr钙钛矿显示出62.8%的高光致发光量子产率，以及在1200小时内对氧气、水分和光辐射具有优异的稳定性，代表了最稳定的无铅钙钛矿之一。这些结果为增强用于高性能发光体的无铅钙钛矿的光学性能和稳定性开辟了一条新途径。
