Transformative Evolution of Organolead Triiodide Perovskite Thin Films from Strong Room-Temperature Solid–Gas Interaction between HPbI3-CH3NH2 Precursor Pair

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• 作者：Shuping Pang ; Yuanyuan Zhou ; Zaiwei Wang ; Mengjin Yang ; Amanda R. Krause ; Zhongmin Zhou ; Kai Zhu ; Nitin P. Padture ; Guanglei Cui
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：January 27, 2016
• 年：2016
• 卷：138
• 期：3
• 页码：750-753
• 全文大小：365K
• ISSN：1520-5126

文摘

We demonstrate the feasibility of a nonsalt-based precursor pair—inorganic HPbI<sub>3sub> solid and organic CH<sub>3sub>NH<sub>2sub> gas—for the deposition of uniform CH<sub>3sub>NH<sub>3sub>PbI<sub>3sub> perovskite thin films. The strong room-temperature solid–gas interaction between HPbI<sub>3sub> and CH<sub>3sub>NH<sub>2sub> induces transformative evolution of ultrasmooth, full-coverage perovskite thin films at a rapid rate (in seconds) from nominally processed rough, partial-coverage HPbI<sub>3sub> thin films. The chemical origin of this behavior is elucidated via in situ experiments. Perovskite solar cells, fabricated using MAPbI<sub>3sub> thin films thus deposited, deliver power conversion efficiencies up to 18.2%, attesting to the high quality of the perovskite thin films deposited using this transformative process.