Sub-1.4eV bandgap inorganic perovskite solar cells with long-term stability

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 D. Schaller, Kai Zhu, Nitin P. Padture*, Yuanyuan Zhou*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

98 Citations (Scopus)


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 languageEnglish
Article number151
Number of pages10
JournalNature Communications
Publication statusPublished - 9 Jan 2020

Scopus Subject Areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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