Mixed Cation FA_xPEA_1-xPbI₃ with Enhanced Phase and Ambient Stability toward High-Performance Perovskite Solar Cells

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• 作者：Nan Li ; Zonglong Zhu ; Chu-Chen Chueh ; Hongbin Liu ; Bo Peng ; Alessio Petrone ; Xiaosong Li ; Liduo Wang and Alex K.-Y. Jen
• 刊名：Advanced Energy Materials
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：7
• 期：1
• 全文大小：1716K
• ISSN：1614-6840

文摘

In this work, different from the commonly explored strategy of incorporating a smaller cation, MA⁺ and Cs⁺ into FAPbI₃ lattice to improve efficiency and stability, it is revealed that the introduction of phenylethylammonium iodide (PEAI) into FAPbI₃ perovksite to form mixed cation FA_xPEA_1–xPbI₃ can effectively enhance both phase and ambient stability of FAPbI₃ as well as the resulting performance of the derived devices. From our experimental and theoretical calculation results, it is proposed that the larger PEA cation is capable of assembling on both the lattice surface and grain boundaries to form quais-3D perovskite structures. The surrounding of PEA⁺ ions at the crystal grain boundaries not only can serve as molecular locks to tighten FAPbI₃ domains but also passivate the surface defects to improve both phase and moisture stablity. Consequently, a high-performance (PCE:17.7%) and ambient stable FAPbI₃ solar cell could be developed.