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

Seon Joo Lee, Seong Sik Shin, Young Chan Kim, Dasom Kim, Tae Kyu Ahn, Jun Hong Noh, Jangwon Seo, Sang Il Seok

Research output: Contribution to journalArticlepeer-review

439 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3974-3977
Number of pages4
JournalJournal of the American Chemical Society
Issue number12
Publication statusPublished - 2016 Apr 20
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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