Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 45, Pages 9689-9694Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc01839g
Keywords
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Funding
- National Basic Research Program of China (973 program) [2011CB302006]
- National Natural Science Foundation of China [10974197, 61475153, 11174273, 11104265, 11134009, 61376054]
- Chinese Academy of Sciences
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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.
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