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Title: Fabrication of efficient low-bandgap perovskite solar cells by combining formamidinium tin iodide with methylammonium lead iodide

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 (FASnI 3) and methylammonium lead iodide (MAPbI 3). The best-performing cell fabricated using a (FASnI 3) 0.6(MAPbI 3) 0.4 absorber with an absorption edge of ~1.2 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/cm 2, and a fill factor of 70.6(70.0)% when measured under forward (reverse) voltage scan. In conclusion, the average PCE of 50 cells we have fabricated is 14.39 ± 0.33%, indicating good reproducibility.
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [2] ;  [5] ;  [6] ;  [2]
  1. The Univ. of Toledo, Toledo, OH (United States); Southeast Univ., Nanjing (China)
  2. The Univ. of Toledo, Toledo, OH (United States)
  3. The Univ. of Toledo, Toledo, OH (United States); Wuhan Univ., Wuhan (China)
  4. Wuhan Univ., Wuhan (China)
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  6. Southeast Univ., Nanjing (China)
Publication Date:
Report Number(s):
Journal ID: ISSN 0002-7863
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 138; Journal Issue: 38; Journal ID: ISSN 0002-7863
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; perovskites solar cells; precusors; methylammonium lead iodide; formamidinium tin iodide
OSTI Identifier: