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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, Hyeon-Ho 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
Publisher: The Royal Society of Chemistry

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