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(NH₂)₂PbI₃ (FAPbI₃) perovskite thin films. This approach entails a simple exposure of as-synthesized CH₃NH₃PbI₃ (MAPbI₃) perovskite thin films to HC(═NH)NH₂ (formamidine or FA) gas at 150 °C, which leads to rapid displacement of the MA⁺ cations by FA⁺ cations in the perovskite structure. The resultant FAPbI₃ perovskite thin films preserve the microstructural morphology of the original MAPbI₃ thin films exceptionally well. Importantly, the myriad processing innovations that have led to the creation of high-quality MAPbI₃ perovskite thin films are directly adaptable to FAPbI₃ through this simple, rapid chemical-conversion route. Accordingly, we show that efficiencies of perovskite solar cells fabricated with FAPbI₃ thin films created using this route can reach ∼18%.