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ZnO Nanowire Based Photoconductor with High Photoconductive Gain

Published online by Cambridge University Press:  23 July 2015

Bhargav Mallampati ,
S. V. Nair ,
H. E. Ruda  and
U. Philipose
Bhargav Mallampati
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A
S. V. Nair
Affiliation:
Centre for Advanced Nanotechnology, University of Toronto, Toronto M5S 3E3, Canada.
H. E. Ruda
Affiliation:
Centre for Advanced Nanotechnology, University of Toronto, Toronto M5S 3E3, Canada.
U. Philipose
Affiliation:
Department of Physics, University of North Texas, Denton, TX 76203, U.S.A
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Abstract

A high gain ZnO nanowire (NW) based photodetector was fabricated, which was sensitive to photoexcitation at or below 370 nm corresponding to the band-edge of ZnO. At an incident wavelength of 370 nm and a bias field of 5 kV/cm, the maximum responsivity was over 105 A/W corresponding to an extremely high photoconductive gain of the order of 106. Through this work we provide experimental evidence of the role of surface and defects in carrier dynamics, resulting in enhanced photoresponse. Using intensity and temperature dependence of the rise and decay rates of photocurrent, we present a detailed analysis that provides an estimate of the activation energies of carrier trapping mechanisms.

Keywords

photoconductivitynanostructureoptoelectronic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1805: Symposium SS/TT – Fabrication and Properties of Oxide Thin Films, Nanostructures and Interfaces for Advanced Applications , 2015 , mrss15-2135932
Copyright
Copyright © Materials Research Society 2015 

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References

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