A modified two-step deposition technique was performed by vapour depositing methylammonium iodide (MAI) on lead iodide $$(\hbox {PbI}_{2})$$ films to fabricate good quality methylammonium lead iodide (MAPI) thin films under an ambient atmosphere, and their properties were compared with conventional two-step solution processed MAPI thin films. Scanning electron microscopy results depicted that the MAI vapour-processed films have a uniform coverage and planar surface compared with the non-uniformly distributed granule-like morphology of the solution-processed MAPI film. X-ray diffraction results confirm that the vapour-processed films have better crystallinity compared to the conventional solution-processed MAPI thin films. An enhancement in the optical absorption and emission was observed for the vapour-processed films. The higher processing temperature of the modified-vapour deposition eliminates the effect of moisture during the ambient atmosphere processing of the MAPI films.

中文翻译：

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一种改进的高温气相沉积技术，用于制备 $$\hbox {CH}_{3}\hbox {NH}_{3}\hbox {PbI}_{3}$$ CH 3 NH 3 PbI 3 薄膜环境气氛

改进的两步沉积技术通过在碘化铅 $$(\hbox {PbI}_{2})$$ 薄膜上气相沉积甲基碘化铵 (MAI) 来制造高质量的甲基碘化铅 (MAPI) 薄膜。环境气氛，并将它们的性能与传统的两步溶液处理的 MAPI 薄膜进行比较。扫描电子显微镜结果表明，与溶液处理的 MAPI 膜的非均匀分布的颗粒状形态相比，MAI 蒸汽处理的膜具有均匀的覆盖范围和平坦的表面。X 射线衍射结果证实，与传统溶液处理的 MAPI 薄膜相比，蒸汽处理的薄膜具有更好的结晶度。对于蒸汽处理的薄膜，观察到光吸收和发射的增强。