Fabrication of Efficient Low-Bandgap Perovskite Solar Cells by Combining Formamidinium Tin Iodide with Methylammonium Lead Iodide

Kai Zhu, Weiqiang Liao, Dewei Zhao, Yue Yu, Niraj Shrestha, Kiran Ghimire, Corey Grice, Changlei Wang, Yuqing Xiao, Alexander Cimaroli, Randy Ellingson, Nikolas Podraza, Ren-Gen Xiong, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

367 Scopus Citations

Abstract

Mixed tin (Sn)-lead (Pb) perovskites with high Sn content exhibit low bandgaps suitable for fabricating the bottom cell of perovskite-based tandem solar cells. In this work, we report on the fabrication of efficient mixed Sn-Pb perovskite solar cells using precursors combining formamidinium tin iodide (FASnI3) and methylammonium lead iodide (MAPbI3). The best-performing cell fabricated using a (FASnI3)0.6(MAPbI3)0.4 absorber with an absorption edge of â1.2 eV achieved a power conversion efficiency (PCE) of 15.08 (15.00)% with an open-circuit voltage of 0.795 (0.799) V, a short-circuit current density of 26.86(26.82) mA/cm2, and a fill factor of 70.6(70.0)% when measured under forward (reverse) voltage scan. The average PCE of 50 cells we have fabricated is 14.39 ± 0.33%, indicating good reproducibility.

Original languageAmerican English
Pages (from-to)12360-12363
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number38
DOIs
StatePublished - 28 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-67260

Keywords

  • formamidinium tin iodide
  • methylammonium lead iodide
  • perovskites solar cells
  • precusors

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