Fabrication of Efficient Formamidinium Tin Iodide Perovskite Solar Cells through SnF2–Pyrazine Complex

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• 作者：Seon Joo Lee ; Seong Sik Shin ; Young Chan Kim ; Dasom Kim ; Tae Kyu Ahn ; Jun Hong Noh ; Jangwon Seo ; Sang Il Seok
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：138
• 期：12
• 页码：3974-3977
• 全文大小：304K
• ISSN：1520-5126

文摘

To fabricate efficient formamidinium tin iodide (FASnI₃) perovskite solar cells (PSCs), it is essential to deposit uniform and dense perovskite layers and reduce Sn⁴⁺ content. Here we used solvent-engineering and nonsolvent dripping process with SnF₂ as an inhibitor of Sn⁴⁺. However, excess SnF₂ induces phase separation on the surface of the perovskite film. In this work, we report the homogeneous dispersion of SnF₂ via the formation of the SnF₂–pyrazine complex. Consequently, we fabricated FASnI₃ PSCs with high reproducibility, achieving a high power conversion efficiency of 4.8%. Furthermore, the encapsulated device showed a stable performance for over 100 days, maintaining 98% of its initial efficiency.