Abstract We present an all solution, two-step method for the production of methylammonium lead iondide (MAPbI3) perovskite thin films. Initially, PbS thin films were deposited on GaAs substrates. Subsequently, PbS films were transformed into PbI2 following treatment with polyiodide solutions. In a second conversion step, MAPbI3 films were obtained by reacting the films with methylammonium iodide solutions. The effect of the solvent on lead iodide morphology and consequently on MAPbI3 morphology was demonstrated. Conversion rate was slower with increasing solvent polarity. Optimization of conversion parameters is crucial for reproducibly obtaining continuous and adhesive perovskite films. Photoluminescence measurements showed that chemical treatments can substantially enhance light emission from the films. This route for all-solution-processed perovskites enables control over film morphology while maintaining a simple and low-cost process.

中文翻译：

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将硫化铅转化为甲基碘化铅钙钛矿薄膜的两步全溶液工艺

摘要 我们提出了一种全溶液两步法生产甲基铵化铅 (MAPbI3) 钙钛矿薄膜。最初，PbS 薄膜沉积在 GaAs 衬底上。随后，在用多碘化物溶液处理后，PbS 薄膜转化为 PbI2。在第二个转化步骤中，MAPbI3 薄膜是通过将薄膜与甲基碘化铵溶液反应而获得的。证明了溶剂对碘化铅形态以及因此对 MAPbI3 形态的影响。随着溶剂极性的增加，转化率变慢。转化参数的优化对于可重复地获得连续且具有粘性的钙钛矿薄膜至关重要。光致发光测量表明化学处理可以显着增强薄膜的光发射。