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Key parameters of two typical intercalation reactions to prepare hybrid inorganic-organic perovskite films

Chinese Physics B 2018年第1期27卷 109-115页

作者：石标郭升魏长春李宝璋丁毅李跃龙万青赵颖张晓丹 Institute of Photoelectronic Thin Film Devices and Technology Nankai University Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Key Laboratory of Optical Information Science and Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) College of Electronic Science and Engineering Nanjing University

A star hybrid inorganic-organic perovskite material selected as an outstanding absorbing layer in solar cells benefits from multiple preparation techniques and excellent photoelectric characteristics. Among numerous synthetic processes, uniform, compact, and multi-stack perovskite thin films can be manufactured using vacuum deposition. During sequential vacuum deposition, the penetration ability of the organic molecules cannot be effectively controlled. In addition, the rela- tionship between the thickness of the inorganic seeding layer and the organic molecule concentration for optimized devices using an evaporation-solution method is unclear. In this work, we prepared high-quality perovskite films by effectively con- trolling the penetration ability and chemical quantity of organic methyl ammonium iodide by monitoring the evaporation pressure and time. Thus, a device efficiency of over 15% was achieved with an all-vacuum prepared perovskite film. For the evaporation-solution method, we reacted different thicknesses of inorganic lead iodine with various concentrations of the organic molecule solution. The inorganic layer thickness and organic molecule concentration showed a linear relationship to achieve an optimum perovskite film, and an empirical formula was obtained. This work noted the key parameters of two intercalation reactions to prepare perovskite films, which paves a way to deliver a device that enables multi-layered structures, such as tandem solar cells.

关键词： perovskite solar cell sequential vacuum deposition evaporation-solution method intercalationreaction

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