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Graphene-silver hybrid devices for sensitive photodetection in the ultraviolet

2018

Article

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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.

Author(s): Paria, Debadrita and Jeong, H. H. and Vadakkumbatt, Vaisakh and Deshpande, Preeti and Fischer, Peer and Ghosh, Arindam and Ghosh, Ambarish
Journal: Nanoscale
Volume: 10
Pages: 7685-7693
Year: 2018
Month: April
Day: 3

Department(s): Micro, Nano, and Molecular Systems
Bibtex Type: Article (article)

DOI: 10.1039/C7NR09061G
State: Published
URL: http://dx.doi.org/10.1039/C7NR09061G

BibTex

@article{2018paria,
  title = {Graphene-silver hybrid devices for sensitive photodetection in the ultraviolet},
  author = {Paria, Debadrita and Jeong, H. H. and Vadakkumbatt, Vaisakh and Deshpande, Preeti and Fischer, Peer and Ghosh, Arindam and Ghosh, Ambarish},
  journal = {Nanoscale},
  volume = {10},
  pages = {7685-7693},
  month = apr,
  year = {2018},
  url = {http://dx.doi.org/10.1039/C7NR09061G},
  month_numeric = {4}
}