Sub-1.4eV Bandgap Inorganic Perovskite Solar Cells with Long-Term Stability

Kai Zhu, Mingyu Hu, Min Chen, Peijun Guo, Hua Zhou, Junjing Deng, Yudong Yao, Yi Jiang, Jue Gong, Zhenghong Dai, Yunxuan Zhou, Feng Qian, Xiaoyu Chong, Jing Feng, Richard Schaller, Nitin Padture, Yuanyuan Zhou

Research output: Contribution to journalArticlepeer-review

98 Scopus Citations


State-of-the-art halide perovskite solar cells have bandgaps larger than 1.45 eV, which restricts their potential for realizing the Shockley-Queisser limit. Previous search for low-bandgap (1.2 to 1.4 eV) halide perovskites has resulted in several candidates, but all are hybrid organic-inorganic compositions, raising potential concern regarding device stability. Here we show the promise of an inorganic low-bandgap (1.38 eV) CsPb0.6Sn0.4I3 perovskite stabilized via interface functionalization. Device efficiency up to 13.37% is demonstrated. The device shows high operational stability under one-sun-intensity illumination, with T80 and T70 lifetimes of 653 h and 1045 h, respectively (T80 and T70 represent efficiency decays to 80% and 70% of the initial value, respectively), and long-term shelf stability under nitrogen atmosphere. Controlled exposure of the device to ambient atmosphere during a long-term (1000 h) test does not degrade the efficiency. These findings point to a promising direction for achieving low-bandgap perovskite solar cells with high stability.

Original languageAmerican English
Article number151
Number of pages10
JournalNature Communications
Issue number1
StatePublished - 1 Dec 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

NREL Publication Number

  • NREL/JA-5900-75600


  • bandgaps
  • hailide perovskites
  • Shockley-Queisser
  • solar cells
  • stability


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