title: Fabrication of Self-Powered Fast-Response Ultraviolet Photodetectors Based on Graphene/ZnO:Al Nanorod-Array-Film Structure with Stable Schottky Barrier.
abstract: A Schottky UV photodetector based on graphene/ZnO:Al nanorod-array-film (AZNF) structure has been fabricated. Different from the previously reported graphene/ZnO photodetectors, this photodetector has a stable Schottky barrier which does not disappear under UV light. Thus, the UV photodetector can work as a high-performance self-powered device. The key to improve the stability of the Schottky barrier is a two-step surface treatment process. As a result, the self-powered photodetector exhibits a UV-to-visible rejection ratio of about 1 × 102, a responsivity of 0.039 A W1-, a short rise time of 37 μs, and a decay time of 330 μs. Furthermore, the photodetector is able to keep the responsivity under low light conditions. In comparison with the previously reported graphene/ZnO UV photodetectors, the photodetector exhibits a higher responsivity at zero bias and a faster response speed. This study provides a potential way to fabricate high-performance self-powered UV photodetectors.
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Li
authors.identifier: http://orcid.org/0000-0003-0072-5442
authors.initials: L
authors.lastname: Duan
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Fengni
authors.initials: F
authors.lastname: He
authors.affiliation: Institute of Physics, Chinese Academy of Sciences , Beijing, 100083, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Tian
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Jibin
authors.initials: J
authors.lastname: Fan
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Yu
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Ni
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Yongnan
authors.initials: Y
authors.lastname: Chen
authors.affiliation: School of Materials Science and Engineering, Chang'an University , The Second Ring Road, Xi'an 710064, China.
authors.forename: Wenxue
authors.initials: W
authors.lastname: Zhang
keywords: UV photodetectors; ZnO:Al nanorod-array-films; graphenes; stable Schottky barriers; two-step surface treatment