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

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 ind...

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Published inJournal of the American Chemical Society Vol. 138; no. 12; pp. 3974 - 3977
Main Authors Lee, Seon Joo, Shin, Seong Sik, Kim, Young Chan, Kim, Dasom, Ahn, Tae Kyu, Noh, Jun Hong, Seo, Jangwon, Seok, Sang Il
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 30.03.2016
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Summary: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.
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content type line 23
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.6b00142