Vanadium substitution: A simple and economic way to improve UV sensing in ZnO

Vanadium substitution: A simple and economic way to improve UV sensing in ZnO

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 state...

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Veröffentlicht in:Journal of applied physics 2018-04, Vol.123 (16)
Hauptverfasser: Srivastava, Tulika, Bajpai, Gaurav, Rathore, Gyanendra, Liu, Shun Wei, Biring, Sajal, Sen, Somaditya
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container_issue 16
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container_title Journal of applied physics
container_volume 123
creator Srivastava, Tulika
Bajpai, Gaurav
Rathore, Gyanendra
Liu, Shun Wei
Biring, Sajal
Sen, Somaditya
description 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.
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title Vanadium substitution: A simple and economic way to improve UV sensing in ZnO
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