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

407 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.

NLR Publication Number

  • NREL/JA-5900-67260

Keywords

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

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