Graphene-silver hybrid devices for sensitive photodetection in the ultraviolet

Paria, D and Jeong, HH and Vadakkumbatt, V and Deshpande, P and Fischer, P and Ghosh, A and Ghosh, A (2018) Graphene-silver hybrid devices for sensitive photodetection in the ultraviolet. In: Nanoscale, 10 (16). pp. 7685-7693.

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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 10000-fold enhancement over the photoresponse of native graphene.

Item Type:	Journal Article
Publication:	Nanoscale
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to the Royal Society of Chemistry.
Keywords:	Graphene; Hybrid systems; Metal nanoparticles; Optoelectronic devices; Photodetectors; Plasmonics; Plasmons; Self assembly; Silver nanoparticles; Ultraviolet spectroscopy, Device fabrication strategies; Growth techniques; Photo-detection efficiencies; Plasmonic nanostructures; Self-assembly technique; Strong enhancement; Van Hove singularities; Wavelength ranges, Graphene devices
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Aug 2022 06:30
Last Modified:	08 Aug 2022 06:30
URI:	https://eprints.iisc.ac.in/id/eprint/75572

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