This work was supported by the National Key Basic Research Program of China (2016YFA0301204, 2013CB922303), the National Natural Science Foundation of China (11274201, 51231007), the 111 Project (B13029), and the Fundamental Research Funds of Shandong University (2014YQ003).
Nanoscale Research Letters
Photovoltaic cells -- Materials, Photovoltaic power generation, Nanostructured materials -- Electric properties
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.
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.