Reproducible One-Step Fabrication of Compact MAPbI3鈥?i>xClx Thin Films Derived from Mixed-Lead-Halide Precursors

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• 作者：Dong Wang ; Zhihong Liu ; Zhongmin Zhou ; Huimin Zhu ; Yuanyuan Zhou ; Changshui Huang ; Zaiwei Wang ; Hongxia Xu ; Yizheng Jin ; Bin Fan ; Shuping Pang ; Guanglei Cui
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：December 23, 2014
• 年：2014
• 卷：26
• 期：24
• 页码：7145-7150
• 全文大小：386K
• ISSN：1520-5002

文摘

Methylammonium lead trihalide perovskites are attracting intensive interest due to its high photovoltaic performance, low cost and one-step solution processability. Since the morphology of the perovskite thin films play the central role on the cell performance, a plethora of methods have been developed to fabricate uniform perovskite film. Herein, we demonstrate that an innovative approach by applying mixed lead salts (PbI₂ + PbCl₂) to facilitate reproducible fabrication of compact perovskite thin film. It is proposed that rapid reaction kinetics of PbI₂ with MAI enables preformation of perovskite within the intermidiate film matrix, working as homogeneously located domains for squential growth of the PbCl₂-derived perovskite. The as-prepared perovskite film exhibited a overall textured crystal morphology and superior compactness, which enables excellent light absorption and long-time preservation of photogenerated charge carriers and therefore exhibits 11% efficiency in planar-structured solar cells. The annealing testing shows the film also possesses very stable morphology upon long-time heating, indicative of the insensitivity of our new protocol to the preparation condition and also the promising thermal stability of its based solar cells. The simplicity of the one-step solution-processing and the high morphology stability of the as-prepared perovskite film endow this mixing lead salts method with feasibility of the large-scale fabrication.