Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 17, Pages 14935-14944Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03216
Keywords
tunable; UV and visible photoresponse; p-type ZnO nanostructures; Au nanoparticles; p-n homojunction
Funding
- Ministry of Science and Technology, Taiwan [MOST 105-2221-E-024-015]
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UV- and visible-light photoresponse was achieved via p-type K-doped ZnO nanowires and nanosheets that were hydrothermally synthesized on an n-ZnO/glass substrate and peppered with Au nanoparticles. The K content of the p-ZnO nanostructures was 0.36 atom %. The UV- and visible-light photoresponse of the p-ZnO nanostructures/n-ZnO sample was roughly 2 times higher than that of the ZnO nanowires. The Au nanoparticles of various densities and diameter sizes were deposited on the p-ZnO nanostructures/n-ZnO samples by a simple UV photochemical reaction method yielding a tunable and enhanced UV- and visible-light photoresponse. The maximum UV and visible photoresponse of the Au nanoparticle sample was obtained when the diameter size of the Au nanoparticle was approximately 5-35 nm. On the basis of the localized surface plasmon resonance effect, the UV, blue, and green photocurrent/dark current ratios of Au nanoparticle/p-ZnO nanostructures/n-ZnO are similar to 1165, similar to 94.6, and similar to 9.7, respectively.
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