Carrier Lifetimes of >1 microseconds in Sn-Pb Perovskites Enable Efficient All-Perovskite Tandem Solar Cells

Jinhui Tong, Zhaoning Song, Dong Hoe Kim, Xihan Chen, Cong Chen, Axel F. Palmstrom, Paul F. Ndione, Matthew O. Reese, Sean P. Dunfield, Obadiah G. Reid, Jun Liu, Fei Zhang, Steven P. Harvey, Zhen Li, Steven T. Christensen, Glenn Teeter, Dewei Zhao, Mowafak M. Al-Jassim, Maikel F.A.M. Van Hest, Matthew C. BeardSean E. Shaheen, Joseph J. Berry, Yanfa Yan, Kai Zhu

Research output: Contribution to journalArticlepeer-review

766 Scopus Citations


All-perovskite-based polycrystalline thin-film tandem solar cells have the potential to deliver efficiencies of >30%. However, the performance of all-perovskite-based tandem devices has been limited by the lack of high-efficiency, low-band gap tin-lead (Sn-Pb)mixed-perovskite solar cells (PSCs).We found that the addition of guanidinium thiocyanate (GuaSCN) resulted inmarked improvements in the structural and optoelectronic properties of Sn-Pb mixed, low-band gap (~1.25 electron volt) perovskite films.The films have defect densities that are lower by a factor of 10, leading to carrier lifetimes of greater than 1 microsecond and diffusion lengths of 2.5 micrometers.These improved properties enable our demonstration of >20% efficient low-band gap PSCs.When combined with wider-band gap PSCs, we achieve 25% efficient four-terminal and 23.1%efficient two-terminal all-perovskite-based polycrystalline thin-film tandemsolar cells.

Original languageAmerican English
Article numbereaav7911
Pages (from-to)475-479
Number of pages5
Issue number6439
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 American Association for the Advancement of Science. All rights reserved.

NREL Publication Number

  • NREL/JA-5900-72619


  • carrier lifetimes
  • optoelectronics
  • perovskite films


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