Optical properties of CsCu${}_2$X${}_3$ (X=Cl, Br and I): A comparative study between hybrid time-dependent density-functional theory and the Bethe-Salpeter equation

Jiuyu Sun, Carsten A. Ullrich

The cesium copper halides CsCu${}_2$X${}_3$ (X=Cl, Br and I) are a class of all-inorganic perovskites with interesting and potentially useful optical properties, characterized by disti…