Journal
JOURNAL OF APPLIED PHYSICS
Volume 123, Issue 16, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5012877
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Funding
- Ministry of Science and Technology, Taiwan [MOST 105-2218-E-131-003, 106-2221-E-131-027]
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The UV sensing in pure ZnO is due to oxygen adsorption/desorption process from the ZnO surface. Vanadium doping improves the UV sensitivity of ZnO. The enhancement in UV sensitivity in vanadium-substituted ZnO is attributed to trapping and de-trapping of electrons at V4+ and V5+-related defect states. The V4+ state has an extra electron than the V5+ state. A V4+ to V5+ transformation happens with excitation of this electron to the conduction band, while a reverse trapping process liberates a visible light. An analytic study of response phenomenon reveals this trapping and de-trapping process. Published by AIP Publishing.
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