Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 5, Pages 990-994Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc02390k
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Funding
- National Nature Science Foundation of China [51372075]
- Research Fund for the Doctoral Program of Higher Education of China (RFDP) [20124208110006]
- Natural Science Foundation of Hubei Province [2014CFB538]
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A self-powered, visible-blind ultraviolet (UV) photodetector based on an n-ZnO nanorod (NRs)/i-MgO/p-GaN structure, light-emitting diode assembled by p-GaN and solution-processed i-MgO/n-ZnO nanorods is reported. We found that the device with a MgO insertion layer under 365 nm UV illumination with the light density of 11.2 mu w cm(-2) showed good UV photovoltaic properties with the open-circuit voltage and short-circuit current of 1.02 V and 510 nA, respectively. It showed good visible-blind UV photo-response characteristic with the ratio of photocurrent to dark current to as high as 8000 at 365 nm and the UV-visible responsivity ratio (R-350 (nm)/R5(00 nm)) reached 34.5. Moreover, the responsivity of the device with MgO insertion layer was 5 times greater than that of a n-ZnO NRs/p-GaN heterojunction at 254 nm. Furthermore, the n-ZnO NRs/i-MgO/p-GaN heterojunction can display electroluminescence characteristic at a forward bias, which was analyzed by the peak-deconvolution with Gaussian functions.
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