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Issue 16, 2018
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Graphene–silver hybrid devices for sensitive photodetection in the ultraviolet

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Abstract

The weak light–matter interaction in graphene can be enhanced with a number of strategies, among which sensitization with plasmonic nanostructures is particularly attractive. This has resulted in the development of graphene–plasmonic hybrid systems with strongly enhanced photodetection efficiencies in the visible and the IR, but none in the UV. Here, we describe a silver nanoparticle–graphene stacked optoelectronic device that shows strong enhancement of its photoresponse across the entire UV spectrum. The device fabrication strategy is scalable and modular. Self-assembly techniques are combined with physical shadow growth techniques to fabricate a regular large-area array of 50 nm silver nanoparticles onto which CVD graphene is transferred. The presence of the silver nanoparticles resulted in a plasmonically enhanced photoresponse as high as 3.2 A W−1 in the wavelength range from 330 nm to 450 nm. At lower wavelengths, close to the Van Hove singularity of the density of states in graphene, we measured an even higher responsivity of 14.5 A W−1 at 280 nm, which corresponds to a more than 10 000-fold enhancement over the photoresponse of native graphene.

Graphical abstract: Graphene–silver hybrid devices for sensitive photodetection in the ultraviolet

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Supplementary files

Article information


Submitted
05 Dec 2017
Accepted
31 Mar 2018
First published
03 Apr 2018

Nanoscale, 2018,10, 7685-7693
Article type
Paper

Graphene–silver hybrid devices for sensitive photodetection in the ultraviolet

D. Paria, H. Jeong, V. Vadakkumbatt, P. Deshpande, P. Fischer, A. Ghosh and A. Ghosh, Nanoscale, 2018, 10, 7685
DOI: 10.1039/C7NR09061G

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