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Plasmonic Enhancement of Optical Absorption of UV Radiation in ZnO Thin Film Based Ultraviolet Photodetectors

Published online by Cambridge University Press:  18 March 2013

Akshta Rajan ,
Ayushi Paliwal ,
Vinay Gupta  and
Monika Tomar
Akshta Rajan
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, INDIA.
Ayushi Paliwal
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, INDIA.
Vinay Gupta
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, INDIA.
Monika Tomar
Affiliation:
Physics Department, Miranda house, University of Delhi, Delhi, INDIA.
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Abstract

Ultraviolet (UV) photoconductivity in pure ZnO thin films and metal (Ag, Au, Pt) nanoparticles (NPs) dispersed on ZnO thin films based UV photodetectors biased at 5 V for ultra violet radiation of λ = 365 nm and intensity = 24 µwatt/cm2 has been studied. All the three metal (Ag, Au, Pt) NPs synthesized by Polyol process when dispersed on the surface of 100 nm thin ZnO film results in enhanced photoconductive gain (K) in comparison to pure ZnO (3.1×103). An increase of about an order in K has been obtained in the case of Ag NPs/ZnO and Au NPs/ZnO UV photodetectors ( K = 6.9×104 and 5.3×104 respectively). On the other hand, Pt NPs enhance K by about two orders (5.0×105). Such an enhanced photoconductive gain has been achieved due to the lowering of dark current after dispersing the metal NPs on the surface of ZnO and increased photocurrent upon UV illumination. This may be attributed to the plasmon propagating property in metal NPs which enhances the light trapping through optical absorption in ZnO thin film surface (high photo current).

Keywords

photoconductivitylaser ablationthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc12-12
Copyright
Copyright © Materials Research Society 2013

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References

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