Self-powered heterojunction photodetector based on thermal evaporated p-CuI and hydrothermal synthesised n-TiO<sub>2</sub> nanorods
Zhiying Zhou, Xiaoxuan Li, Fengzhou Zhao, Cheng Wang, Menglong Zhang, Shunli He, Yuqi Zhang, Dengying Zhang, Man Xu, Lichun Zhang
Abstract
CuI film was grown by thermal evaporation technology on TiO 2 nanorods array synthesized using a hydrothermal method, and a p-CuI/n-TiO 2 heterostructure photodetector was constructed. The structure, morphology, light absorption, and photoresponse performance of the device were investigated. The heterojunction detector is self-powered and sensitive to light in the range of 320nm∼450nm. At 0V, the on/off ratio of the device is ∼770. The peak responsivity (0V, 410nm) is about 4.5mA/W and the peak detectivity is 1.08×10 11 Jones. Also, the reproducibility and stability of the heterojunction photodetector are excellent. This work provides an effective route for the study of self-powered photodetectors.