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Article
High-Performance Self-Powered Photodetectors Based on ZnO/ZnS Core-Shell Nanorod Arrays
Nanoscale Research Letters
  • Hailing Lin, Shandong University
  • Lin Wei, Shandong University
  • Cuncun Wu, Shandong University
  • Yanxue Chen, Shandong University
  • Shishen Yan, Shandong University
  • Liangmo Mei, Shandong University
  • Jun Jiao, Portland State University
Document Type
Article
Publication Date
9-1-2016
Subjects
  • Photovoltaic cells -- Materials,
  • Photovoltaic power generation,
  • Nanostructured materials -- Electric properties
Abstract
In recent years, there is an urgent demand for high-performance ultraviolet photodetectors with high photosensitivity, fast responsivity, and excellent spectral selectivity. In this letter, we report a self-powered photoelectrochemical cell-type UV detector using the ZnO/ZnS core-shell nanorod array as the active photoanode and deionized water as the electrolyte. This photodetector demonstrates an excellent spectral selectivity and a rapid photoresponse time of about 0.04 s. And the maximum responsivity is more than 0.056 (A/W) at 340 nm, which shows an improvement of 180 % compared to detectors based on the bare ZnO nanorods. This improved photoresponsivity can be understood from the step-like band energy alignment of the ZnO/ZnS interface, which will accelerate the separation of photoexcited electron-hole pairs and improve the efficiency of the photodetector. Considering its uncomplicated low-cost fabrication process, and environment-friendly feature, this self-powered device is a promising candidate for UV detector application.
Description

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

DOI
10.1186/s11671-016-1639-7
Persistent Identifier
http://archives.pdx.edu/ds/psu/18364
Citation Information
Lin, H., Wei, L., Wu, C., Chen, Y., Yan, S., Mei, L., & Jiao, J. (2016). High-Performance Self-powered Photodetectors Based on ZnO/ZnS Core-Shell Nanorod Arrays. Nanoscale Research Letters, 11, 420.