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

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 15; pp. 8818 - 8825
• Main Authors: Bin-Bin, Yu, Liao, Min, Yang, Jingxiu, Chen, Wei, Zhu, Yudong, Zhang, Xusheng, Duan, Tao, Yao, Weitang, Su-Huai Wei, He, Zhubing
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2019
• Subjects: Alloying elements; alloys; bismuth; bromides; bromine; cesium; crystal structure; Density functional theory; Energy conversion efficiency; Energy gap; engineering; iodides; Lead free; Optoelectronic devices; Perovskites; phase transition; Phase transitions; Photovoltaic cells; Photovoltaics; Solar cells; solar energy

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...