Self-Powered Visible-Blind Ultraviolet Photodetector Based on Organic-Inorganic Hybrid Copper Halide [N(C 2 H 5 ) 4 ] 2 [Cu 2 Br 4 ].

Organic-inorganic hybrid ternary copper halides offer a broader spectrum of structural possibilities for finely tuning their optoelectronic properties. Herein, we demonstrate for the first time the potential of [N(C 2 H 5 ) 4 ] 2 [Cu 2 Br 4 ], a zero-dimensional hybrid copper halide [(TEA) 2 Cu 2 Br 4 ], for ultraviolet (UV) photodetection. A self-powered, visible-blind UV photodetector based on a (TEA) 2 Cu 2 Br 4 /GaN heterojunction architecture is developed, exhibiting a high responsivity, a high detectivity, and fast response speeds. The device demonstrates exceptional stability against environmental oxygen/moisture, heat, and UV light illumination, surpassing the stability of reported copper-based UV photodetectors. Our work highlights the significant potential of (TEA) 2 Cu 2 Br 4 as a lead-free, stable, and efficient material for next-generation UV photodetection technology.