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ZnO-Sn Bilayer Ultraviolet (UV) Photon Detector with Improved Responsitivity

Published online by Cambridge University Press:  01 February 2011

Harish Kumar Yadav ,
K. Sreenivas  and
Vinay Gupta
Harish Kumar Yadav
Affiliation:
[email protected], University of Delhi, Department of physics and Astrophysics, C\0 Dr Vinay Gupta, Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India, Delhi, 110007, India, 91-11-9873059996
K. Sreenivas
Affiliation:
[email protected], University of Delhi, Department of Physics and Astrophysics, Delhi, 110007, India
Vinay Gupta
Affiliation:
[email protected], University of Delhi, Department of Physics and Astrophysics, Delhi, 110007, India
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Abstract

The influence of the integration of ultra-thin layer of different metals (Al, Cu, Sn, Te, Pb and Au) with the c-axis oriented ZnO thin film on the ultraviolet (UV) photoresponse is investigated. The transfer of electrons from the metal layer to the semiconductor at the interface compensate the surface states which otherwise takes electrons from the interior of ZnO layer and thereby increases the conductivity under UV illumination. The Sn/ZnO sample exhibits a responsivity of the order of 8.5 KV/W at a low UV intensity of 140 μW/cm2 (⎻ = 365 nm) with a fast rise and fall time of 105 and 400 ms respectively.

Keywords

photoconductivitysputteringthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K07-14
Copyright
Copyright © Materials Research Society 2007

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References

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