Exceptional Morphology-Preserving Evolution of Formamidinium Lead Triiodide Perovskite Thin Films via Organic-Cation Displacement

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• 作者：Yuanyuan Zhou ; Mengjin Yang ; Shuping Pang ; Kai Zhu ; Nitin P. Padture
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：138
• 期：17
• 页码：5535-5538
• 全文大小：367K
• 年卷期：0
• ISSN：1520-5126

文摘

Here we demonstrate a radically different chemical route for the creation of HC(NH<sub>2sub>)<sub>2sub>PbI<sub>3sub> (FAPbI<sub>3sub>) perovskite thin films. This approach entails a simple exposure of as-synthesized CH<sub>3sub>NH<sub>3sub>PbI<sub>3sub> (MAPbI<sub>3sub>) perovskite thin films to HC(═NH)NH<sub>2sub> (formamidine or FA) gas at 150 °C, which leads to rapid displacement of the MA<sup>+sup> cations by FA<sup>+sup> cations in the perovskite structure. The resultant FAPbI<sub>3sub> perovskite thin films preserve the microstructural morphology of the original MAPbI<sub>3sub> thin films exceptionally well. Importantly, the myriad processing innovations that have led to the creation of high-quality MAPbI<sub>3sub> perovskite thin films are directly adaptable to FAPbI<sub>3sub> through this simple, rapid chemical-conversion route. Accordingly, we show that efficiencies of perovskite solar cells fabricated with FAPbI<sub>3sub> thin films created using this route can reach ∼18%.