图 8  三卤化物钙钛矿的光稳定性　(a), (b)对照组钙钛矿薄膜(Cs25Br20)经过10倍和100倍太阳光照20 min后的PL光谱, 箭头表示PL峰位随时间变化的方向; (c)对照组薄膜的光谱中心随时间的移动, 在更强光照下, 红移变得更加明显; (d), (e)三卤钙钛矿薄膜(Cs25Br20+Cl3)分别经过10倍和100倍太阳光照20 min后的PL光谱; (f)三卤钙钛矿薄膜的光谱中心随时间的移动, 在更强光照下, 蓝移变得更加明显[44]

Fig. 8.  Light stability of triple-halide perovskite: (a), (b) PL spectra of control perovskite films (Cs25Br20) under 10-sun and 100-sun illumination for 20 min, respectively. Arrows indicate the direction of the PL shift over time; (c) the shift of the spectral centroids of control films over time. The red shift becomes more obvious under higher injection; (d), (e) PL spectra of triple-halide perovskites (Cs22Br15+Cl3) under 10-sun and 100-sun illumination for 20 min, respectively; (f) the shift of the spectral centroids of triple-halide perovskites over time. The blue shift becomes more obvious under higher injection[44].