Affiliation:
1. Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics School of Science Tianjin University of Technology Tianjin 300384 China
2. School of Materials Science and Engineering Key Laboratory of Display Materials and Photoelectric Devices of the Ministry of Education Tianjin Key Laboratory for Photoelectric Materials and Devices Tianjin University of Technology Tianjin 300384 China
3. School of Science Tianjin University of Technology and Education Tianjin 300222 China
Abstract
AbstractHigh‐performance broadband photodetectors (PDs) are essential components in spectroscopy, remote sensing, imaging, and light communication applications. In this paper, Sb2Se3 nanoparticles (NPs) are uniformly deposited on TiO2 nanorod arrays (NRs) to construct a type II heterojunction with good interfacial contact by a simple two‐step potentiostatic electrochemical deposition method combined with N2 atmosphere annealing at 280, 290 and 300 °C to control the amount of Se in Sb2Se3. A good interfacial contact between Sb2Se3 and TiO2 is conducive to the separation and transport of photogenerated carriers. Sb2Se3/TiO2 PDs exhibit excellent self‐powered photoresponse in a broad spectral range from ultraviolet‐visible‐near infrared (UV‐VIS‐NIR) due to the combined effects of high light absorption, low defect density, and more suitable band alignment. The optimal parameters with a responsivity of 13.48 A W−1, detectivity of 7.9 × 1011 Jones, and response time of 18/20 µs are demonstrated for the PDs annealed at 290 °C. The excellent performance broadband Sb2Se3/TiO2 PDs are used to construct the application models in the light communication for light encryption and flaw detection. This work opens up a new strategy for Sb2Se3/TiO2 PDs in multifunctional applications.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Tianjin Municipality
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials