Alloy-induced phase transition and enhanced photovoltaic performance: the case of Cs3Bi2I9−xBrx perovskite solar cells

  title={Alloy-induced phase transition and enhanced photovoltaic performance: the case of Cs3Bi2I9−xBrx perovskite solar cells},
  author={Bin-Bin Yu and Min Liao and Jingxiu Yang and W. Chen and Yudong Zhu and Xusheng Zhang and Tao Duan and Weitang Yao and Suhuai Wei and Zhubing He},
  journal={Journal of Materials Chemistry},
Cs3Bi2I9 is a promising inorganic, nontoxic, and stable perovskite material for solar cell applications, but the power conversion efficiency of Cs3Bi2I9-based solar cells is relatively low because its band gap is too large and indirect. Here we show that the band gap and optoelectronic properties of Cs3Bi2I9 can be improved by alloying Br into Cs3Bi2I9, despite the common expectation that the band gap of the Cs3Bi2I9−xBrx alloy will increase with Br concentration. By systematically growing and… Expand
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