A High-Performance UVA Photodetector Based on Polycrystalline Perovskite MAPbCl<sub>3</sub>/TiO<sub>2</sub> Nanorods Heterojunctions
Yupeng Zhang,
Yannan Zhai,
Hui Zhang,
Zhaoxin Wang,
Yongfeng Zhang,
Ruiliang Xu,
Shengping Ruan,
Jingran Zhou
Affiliations
Yupeng Zhang
College of Electronic Science & Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Yannan Zhai
Aviation University of Air Force, 7855 Renmin Street, Changchun 130012, China
Hui Zhang
Aviation University of Air Force, 7855 Renmin Street, Changchun 130012, China
Zhaoxin Wang
Aviation University of Air Force, 7855 Renmin Street, Changchun 130012, China
Yongfeng Zhang
College of Electronic Science & Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Ruiliang Xu
State Key Laboratory of High Power Semiconductor Lasers, School of Science, Changchun University of Science and Technology, 7089 Wei-Xing Road, Changchun 130022, China
Shengping Ruan
College of Electronic Science & Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
Jingran Zhou
College of Electronic Science & Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
The application of TiO2 nanorods in the field of ultraviolet (UV) photodetectors is hindered by a high dark current, which is attributed to crystal surface defects and intrinsic excitation by carrier thermal diffusion. Here, a photodetector based on polycrystalline perovskite MAPbCl3/TiO2 nanorods heterojunctions has been fabricated to overcome the shortcoming. The structure was composed of horizontal MAPbCl3 polycrystalline and vertically aligned TiO2 nanorods array. Many localized depletion regions at the MAPbCl3/TiO2 interface can reduce the dark current. The TiO2/MAPbCl3 detector shows high performance including a high ratio of light-dark current of about six orders of magnitude, which is much larger than that of the TiO2 detector. This study indicates the potential in the TiO2/MAPbCl3 heterojunction to fabricate high-performance UV detectors.
