(a) Atomic arrangements of the trigonal phase of Cs₃Sb₂Cl₉ nanowires: unit cell (top) and SbCl₆ octahedra (bottom). (b) Atomic arrangements of the orthorhombic phase: irregular triangular planar geometry of Sb and Cl (top) and polyhedron (bottom). Black, red, and white spheres correspond to Sb, Cs, and Cl, respectively. (c) Schematic of the photodetector device. (d) Current versus voltage characteristics of the Cs₃Sb₂Cl₉ nanowires under dark and light-illuminated conditions. Inset is an optical image of the device. (e) Photo-switching behavior at 0.9 V, revealing fast on/off switching states with a time interval of 500 ms. (f) Rise and decay times of a single on/off cycle.^[95]