Tang Sheng, Xiao Xinyu, Hu Jing, Gao Bo, Chen Hunglin, Peng Zongyang, Wen Jianchun, Era Masanao, Zou Dechun
Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Department of Chemistry and Applied Chemistry, Saga University, Saga, 840-8502, Japan.
Chempluschem. 2020 Jan;85(1):240-246. doi: 10.1002/cplu.201900723.
Hybrid perovskites have recently received much attention in optoelectronic applications. However, hybrid perovskites are unstable in a humid environment. Mixed halide perovskites (MHPs) show enhanced stability and band-gap tunability upon engineering of their halide composition. Here, MHPs are prepared through a solvent-free mechanochemical synthesis (MCS) route that allows superior control over halide compositions than the solvent synthesis routes (SS). The MCS route eliminates the problem in the preparation of MAPb(I Br ) with continuously varying x, while maintaining the material properties and suppressing phase segregation present in SS routes. UV-vis absorption and X-ray diffraction patterns confirm the production of the desired pure-phase MHPs. For MAPb(I Br ) (0≤x≤1), with increased ratio of halide (x), the cubic phase gradually transforms into the tetragonal phase and band-gap tunability is accomplished. The MCS route for the preparation of MHPs is a very promising and efficient technique for superior control in optoelectronic properties, leading to improved control in fabrication approaches.
混合钙钛矿最近在光电子应用中备受关注。然而，混合钙钛矿在潮湿环境中不稳定。混合卤化物钙钛矿（MHP）在对其卤化物组成进行工程设计时表现出增强的稳定性和带隙可调性。在此，通过无溶剂机械化学合成（MCS）路线制备MHP，该路线比溶剂合成路线（SS）能更好地控制卤化物组成。MCS路线消除了制备具有连续变化x的MAPb（I Br）时的问题，同时保持材料性能并抑制SS路线中存在的相分离。紫外可见吸收和X射线衍射图谱证实了所需纯相MHP的生成。对于MAPb（I Br）（0≤x≤1），随着卤化物（x）比例的增加，立方相逐渐转变为四方相，并实现了带隙可调性。制备MHP的MCS路线是一种非常有前途且高效的技术，可用于更好地控制光电子性能，从而改进制造方法中的控制。
