Self-Powered Visible-Blind Ultraviolet Photodetector Based on Organic-Inorganic Hybrid Copper Halide [N(C₂H₅)₄]₂[Cu₂Br₄]

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(C₂H₅)₄]₂[Cu₂Br₄], a zero-dimensional hybrid copper halide [(TEA)₂Cu₂Br₄], for ultraviolet (UV) photodetection. A self-powered, visible-blind UV photodetector based on a (TEA)₂Cu₂Br₄/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)₂Cu₂Br₄ as a lead-free, stable, and efficient material for next-generation UV photodetection technology.