High-Performance Methylammonium-Free Ideal-Band-Gap Perovskite Solar Cells

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

Research output: Contribution to journalArticlepeer-review

53 Scopus Citations


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 languageAmerican English
Pages (from-to)1365-1376
Number of pages12
Issue number4
StatePublished - 7 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Inc.

NREL Publication Number

  • NREL/JA-5900-79293


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


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