Herein, a very simple, solvent free, scalable, and single-step approach to prepare organometal halide perovskite powders via mechanochemical synthesis followed by the deposition of perovskite films by spin coating is reported. This work particularly deals with various parameters that influence the crystallization process and morphology (hyperbranched) of methylammonium lead iodide films. Moreover, the influence of growth temperature on the morphology and the transition from tetragonal to cubic structure are investigated. The mechanosynthesized perovskite provides hyperbranched morphology and crystalline films in a hexagonal shape and serves as a better precursor for the absorber layer in perovskite solar cells.

中文翻译：

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高结晶度甲基铵碘化铅薄膜：通过热退火从四方结构转变为立方结构

在本文中，报道了一种非常简单，无溶剂，可扩展的单步方法，该方法通过机械化学合成然后通过旋涂沉积钙钛矿薄膜来制备有机金属卤化物钙钛矿粉末。这项工作特别涉及影响甲基铵碘化铅薄膜的结晶过程和形态（超支化）的各种参数。此外，研究了生长温度对形态和从四方结构向立方结构转变的影响。机械合成的钙钛矿提供了超支化的形态和六边形的结晶膜，并作为钙钛矿太阳能电池吸收层的较好前驱体。