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Open Access Nano Express

Photocurrent enhancement mechanisms in bilayer nanofilm-based ultraviolet photodetectors made from ZnO and ZnS spherical nanoshells

Lin Peng12*, Sancan Han1 and Xinhua Hu1

Author Affiliations

1 Department of Materials Science, Fudan University, Shanghai 200433, People’s Republic of China

2 Department of Physics, Shanghai University of Electric Power, Shanghai 200090, People’s Republic of China

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Nanoscale Research Letters 2014, 9:388  doi:10.1186/1556-276X-9-388

Published: 11 August 2014

Abstract

Hollow-sphere bilayer nanofilm-based ultraviolet light photodetectors made from ZnO and ZnS spherical nanoshells show enhanced photocurrent, which are comparable to or even better than those of other semiconductor nanostructures with different shapes. In this work, the photocurrent enhancement mechanisms of these bilayer nanofilm-based ultraviolet light photodetectors are explained, which could be attributed to the strong light absorption based on the whispering gallery mode resonances, the separation of the photogenerated carriers through the internal electric field within the bilayer nanofilms, the hopping-like electrical transport, and the effective charge injection from Cr/Au contacts to the nanofilms.

Keywords:
Hollow-sphere bilayer nanofilm; Ultraviolet light photodetector; Whispering gallery mode resonances