带隙
卤化物
材料科学
钙钛矿(结构)
半导体
成核
旋节分解
光电子学
纳米晶材料
纳米晶
相(物质)
化学物理
纳米技术
结晶学
无机化学
化学
有机化学
作者
Xi Wang,Yichuan Ling,Xiujun Lian,Yan Xin,Kamal B. Dhungana,Fernando Perez‐Orive,Javon M. Knox,Zhizhong Chen,Yan Zhou,Drake Beery,Kenneth Hanson,Jian Shi,Shangchao Lin,Hanwei Gao
标识
DOI:10.1038/s41467-019-08610-6
摘要
Abstract The functionality and performance of a semiconductor is determined by its bandgap. Alloying, as for instance in In x Ga 1-x N, has been a mainstream strategy for tuning the bandgap. Keeping the semiconductor alloys in the miscibility gap (being homogeneous), however, is non-trivial. This challenge is now being extended to halide perovskites – an emerging class of photovoltaic materials. While the bandgap can be conveniently tuned by mixing different halogen ions, as in CsPb(Br x I 1-x ) 3 , the so-called mixed-halide perovskites suffer from severe phase separation under illumination. Here, we discover that such phase separation can be highly suppressed by embedding nanocrystals of mixed-halide perovskites in an endotaxial matrix. The tuned bandgap remains remarkably stable under extremely intensive illumination. The agreement between the experiments and a nucleation model suggests that the size of the nanocrystals and the host-guest interfaces are critical for the photo-stability. The stabilized bandgap will be essential for the development of perovskite-based optoelectronics, such as tandem solar cells and full-color LEDs.
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