Flexible UV photodetector based on copper tetraiodogallate (CuGaI<sub>4</sub>) film
Haoyu Chen, Bingxu Liu, Jiupeng Cao, Lian Ji, Jiankai Xie, Yuting Shu, Jingjin Dong, Aifei Wang, Fangfang Wang, Feng Yan, Tianshi Qin
Abstract
Abstract The Cu‐based halide semiconductor CuGaI 4 was prepared by a high‐temperature melting method. Optoelectronic characterization and density functional theory calculations of CuGaI 4 reveal a direct bandgap of 2.9 eV. The corresponding UV photodetector (PD) based on CuGaI 4 demonstrates excellent UV response and rapid response time. In addition, a flexible PD based on CuGaI 4 is prepared, which also displays excellent photoresponse characteristics and mechanical stability. This work provides a systematic study of this novel Cu‐based halide semiconductor and demonstrates the great potential of CuGaI 4 for future UV optoelectronic devices.