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(Ix Br1-x )3 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(Ix Br1-x )3 (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.

中文翻译：

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用于连续组成和带隙调谐的纯系列混合卤化物钙钛矿MAPb（Ix Br1-x）3和MAPb（Brx Cl1-x）3系统系列的无溶剂机械化学合成。

混合钙钛矿最近在光电应用中受到了广泛关注。但是，混合钙钛矿在潮湿环境中不稳定。混合卤化物钙钛矿（MHP）在对卤化物成分进行工程改造后显示出更高的稳定性和带隙可调性。在这里，MHP是通过无溶剂机械化学合成（MCS）途径制备的，该途径比溶剂合成途径（SS）能够更好地控制卤化物的组成。MCS路线消除了制备x连续变化的MAPb（Ix Br1-x）3的问题，同时保持了材料特性并抑制了SS路线中存在的相偏析。紫外可见吸收和X射线衍射图谱证实了所需纯相MHP的产生。对于MAPb（Ix Br1-x）3（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。用于制备MHP的MCS路线是一种非常有前途且有效的技术，可以对光电特性进行出色的控制，从而改善了制造方法的控制。