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Ambient-Air-Stable Lead-Free CsSnI3 Solar Cells with Greater than 7.5% Efficiency.

  • Ye, Tao1, 2
  • Wang, Ke2
  • Hou, Yuchen1, 2
  • Yang, Dong1, 2
  • Smith, Nicholas3
  • Magill, Brenden3
  • Yoon, Jungjin1, 2
  • Mudiyanselage, Rathsara R H H3
  • Khodaparast, Giti A3
  • Wang, Kai1, 2
  • Priya, Shashank1, 2
  • 1 Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States. , (United States)
  • 2 Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, United States. , (United States)
  • 3 Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, United States. , (United States)
Published Article
Journal of the American Chemical Society
American Chemical Society
Publication Date
Mar 11, 2021
DOI: 10.1021/jacs.0c13069
PMID: 33705120


Black orthorhombic (B-γ) CsSnI3 with reduced biotoxicity and environmental impact and excellent optoelectronic properties is being considered as a promising eco-friendly candidate for high-performing perovskite solar cells (PSCs). A major challenge in a large-scale implementation of CsSnI3 PSCs includes the rapid transformation of Sn2+ to Sn4+ (within a few minutes) under an ambient-air condition. Here, we demonstrate that ambient-air stable B-γ CsSnI3 PSCs can be fabricated by incorporating N,N'-methylenebis(acrylamide) (MBAA) into the perovskite layer and by using poly(3-hexylthiophene) as the hole transporting material. The lone electron pairs of -NH and -CO units of MBAA are designed to form coordination bonding with Sn2+ in the B-γ CsSnI3, resulting in a reduced defect (Sn4+) density and better stability under multiple conditions for the perovskite light absorber. After a modification, the highest power conversion efficiency (PCE) of 7.50% is documented under an ambient-air condition for the unencapsulated CsSnI3-MBAA PSC. Furthermore, the MBAA-modified devices sustain 60.2%, 76.5%, and 58.4% of their initial PCEs after 1440 h of storage in an inert condition, after 120 h of storage in an ambient-air condition, and after 120 h of 1 Sun continuous illumination, respectively.

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