Deshpande, P and Suri, P and Jeong, HH and Fischer, P and Ghosh, A and Ghosh, A (2020) Investigating photoresponsivity of graphene-silver hybrid nanomaterials in the ultraviolet. In: Journal of Chemical Physics, 152 (4).
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Abstract
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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Chemical Physics |
| Publisher: | American Institute of Physics Inc. |
| Additional Information: | Copyright of this article belongs to American Institute of Physics Inc. |
| Keywords: | Gold nanoparticles; Graphene; Infrared devices; Metal nanoparticles; Nanostructured materials; Plasmonic nanoparticles; Plasmonics; Ultraviolet visible spectroscopy, Absorption property; Hybrid nanomaterials; Hybrid structure; Photocurrent measurement; Photoresponsivity; Raman and UV-visible spectroscopy; Silver and gold nanoparticles; Spatial arrangements, Silver nanoparticles |
| Department/Centre: | Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 20 Feb 2020 05:52 |
| Last Modified: | 20 Feb 2020 05:52 |
| URI: | http://eprints.iisc.ac.in/id/eprint/64587 |
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