Issue 45, 2014

Realization of a self-powered ZnO MSM UV photodetector with high responsivity using an asymmetric pair of Au electrodes

Abstract

We demonstrate a novel type of ZnO self-powered photodetector based on the asymmetric metal-semiconductor-metal (MSM) structure: one Au interdigitated electrode with wide fingers and the other one with narrow fingers. These ZnO photodetectors exhibit attractive photovoltaic characteristics at 0 V bias. More interestingly, with increasing the asymmetric ratio (the width of wide fingers : the width of narrow fingers) of the interdigitated electrodes, the responsivity of the ZnO self-powered UV photodetectors was enhanced obviously, reaching as high as 20 mA W−1 when the asymmetric ratio was 20 : 1. A physical model based on band energy theory was developed to illustrate the origin of the photoresponse at 0 V in our device. Our findings provide a new route to realizing self-powered photodetectors.

Graphical abstract: Realization of a self-powered ZnO MSM UV photodetector with high responsivity using an asymmetric pair of Au electrodes

Supplementary files

Article information

Article type
Paper
Submitted
18 Aug 2014
Accepted
15 Sep 2014
First published
01 Oct 2014

J. Mater. Chem. C, 2014,2, 9689-9694

Author version available

Realization of a self-powered ZnO MSM UV photodetector with high responsivity using an asymmetric pair of Au electrodes

H. Chen, K. Liu, X. Chen, Z. Zhang, M. Fan, M. Jiang, X. Xie, H. Zhao and D. Shen, J. Mater. Chem. C, 2014, 2, 9689 DOI: 10.1039/C4TC01839G

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