There have been several reports of plasmonically enhanced graphene photodetectors in the visible and the near infrared regime but rarely in the ultraviolet. In a previous work, we have reported that a graphene-silver hybrid structure shows a high photoresponsivity of 13 A/W at 270 nm. Here, we consider the likely mechanisms that underlie this strong photoresponse. We investigate the role of the plasmonic layer and examine the response using silver and gold nanoparticles of similar dimensions and spatial arrangement. The effect on local doping, strain, and absorption properties of the hybrid is also probed by photocurrent measurements and Raman and UV-visible spectroscopy. We find that the local doping from the silver nanoparticles is stronger than that from gold and correlates with a measured photosensitivity that is larger in devices with a higher contact area between the plasmonic nanomaterials and the graphene layer.
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31 January 2020
Research Article|
January 27 2020
Investigating photoresponsivity of graphene-silver hybrid nanomaterials in the ultraviolet
Special Collection:
Emerging Directions in Plasmonics
Preeti Deshpande
;
Preeti Deshpande
1
Centre for Nano Science and Engineering, Indian Institute of Science
, Bangalore, India
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Priyanka Suri;
Priyanka Suri
1
Centre for Nano Science and Engineering, Indian Institute of Science
, Bangalore, India
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Hyeon-Ho Jeong;
Hyeon-Ho Jeong
2
Max Planck Institute for Intelligent Systems
, Heisenbergstr. 3, 70569 Stuttgart, Germany
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Peer Fischer;
Peer Fischer
2
Max Planck Institute for Intelligent Systems
, Heisenbergstr. 3, 70569 Stuttgart, Germany
3
Institute for Physical Chemistry, University of Stuttgart
, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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Arindam Ghosh;
Arindam Ghosh
a)
4
Department of Physics, Indian Institute of Science
, Bangalore, India
a)Author to whom correspondence should be addressed: ambarish@iisc.ac.in
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Ambarish Ghosh
Ambarish Ghosh
a)
1
Centre for Nano Science and Engineering, Indian Institute of Science
, Bangalore, India
4
Department of Physics, Indian Institute of Science
, Bangalore, India
a)Author to whom correspondence should be addressed: ambarish@iisc.ac.in
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a)Author to whom correspondence should be addressed: ambarish@iisc.ac.in
Note: This paper is part of the JCP Special Topic on Emerging Directions in Plasmonics.
J. Chem. Phys. 152, 044709 (2020)
Article history
Received:
November 19 2019
Accepted:
December 29 2019
Citation
Preeti Deshpande, Priyanka Suri, Hyeon-Ho Jeong, Peer Fischer, Arindam Ghosh, Ambarish Ghosh; Investigating photoresponsivity of graphene-silver hybrid nanomaterials in the ultraviolet. J. Chem. Phys. 31 January 2020; 152 (4): 044709. https://doi.org/10.1063/1.5138722
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