High-performance methylammonium-free ideal-band-gap perovskite solar cells

Jinhui Tong, Jue Gong, Mingyu Hu, Srinivas K. Yadavalli, Zhenghong Dai, Fei Zhang, Chuanxiao Xiao, Ji Hao, Mengjin Yang, Michael A. Anderson, Erin L. Ratcliff, Joseph J. Berry, Nitin P. Padture*, Yuanyuan Zhou*, Kai Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

53 Citations (Scopus)


The development of mixed tin-lead (Sn-Pb)-based perovskite solar cells (PSCs) with low band gap (1.2–1.4 eV) has become critical not only for pushing single-junction devices toward the maximum efficiency given by the Shockley-Queisser limit, but also for enabling all-perovskite tandem devices beyond this limit. However, achieving high power-conversion efficiency (PCE) and long-term device operation stability simultaneously remains a significant challenge for Sn-Pb-based PSCs. Here, we demonstrate near ideal-band-gap (∼1.34 eV) methylammonium-free Sn-Pb-based PSCs with high efficiency (∼20%) and promising operational stability of maintaining >80% of initial PCE over 750 h under maximum-power-point tracking. The key to this success is the use of a SnCl2⋅3FACl complex additive that improves the microstructure and reduces the development of residual stress in the Sn-Pb perovskite thin films, which in turn enhances the efficiency and stability of the Sn-Pb-based ideal-band-gap PSCs.

Original languageEnglish
Pages (from-to)1365-1376
Number of pages12
Issue number4
Early online date29 Jan 2021
Publication statusPublished - 7 Apr 2021

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • perovskite solar cells
  • Sn-Pb perovskite
  • ideal band gap
  • additives
  • strain
  • stability


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