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Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector
We use an ultra-fast near-infrared pulse coincidence technique to study the time, temperature, and power dependence of the photoresponse of a bi-metal contacted graphene photodetector. We observe two components of the photovoltage signal. One component is gate-voltage dependent, linear in power at r...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4594039/ https://www.ncbi.nlm.nih.gov/pubmed/26441034 http://dx.doi.org/10.1038/srep14803 |
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author | Cai, Xinghan Suess, Ryan J. Drew, H. Dennis Murphy, Thomas E. Yan, Jun Fuhrer, Michael S. |
author_facet | Cai, Xinghan Suess, Ryan J. Drew, H. Dennis Murphy, Thomas E. Yan, Jun Fuhrer, Michael S. |
author_sort | Cai, Xinghan |
collection | PubMed |
description | We use an ultra-fast near-infrared pulse coincidence technique to study the time, temperature, and power dependence of the photoresponse of a bi-metal contacted graphene photodetector. We observe two components of the photovoltage signal. One component is gate-voltage dependent, linear in power at room temperature and sub-linear at low temperature-consistent with the hot-electron photothermoelectric effect due to absorption in the graphene. The power dependence is consistent with supercollision-dominated cooling in graphene. The other component is gate-voltage independent and linear in temperature and power, which we interpret as due to thermoelectricity of the metal electrodes due to differential light absorption. |
format | Online Article Text |
id | pubmed-4594039 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-45940392015-10-13 Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector Cai, Xinghan Suess, Ryan J. Drew, H. Dennis Murphy, Thomas E. Yan, Jun Fuhrer, Michael S. Sci Rep Article We use an ultra-fast near-infrared pulse coincidence technique to study the time, temperature, and power dependence of the photoresponse of a bi-metal contacted graphene photodetector. We observe two components of the photovoltage signal. One component is gate-voltage dependent, linear in power at room temperature and sub-linear at low temperature-consistent with the hot-electron photothermoelectric effect due to absorption in the graphene. The power dependence is consistent with supercollision-dominated cooling in graphene. The other component is gate-voltage independent and linear in temperature and power, which we interpret as due to thermoelectricity of the metal electrodes due to differential light absorption. Nature Publishing Group 2015-10-06 /pmc/articles/PMC4594039/ /pubmed/26441034 http://dx.doi.org/10.1038/srep14803 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Cai, Xinghan Suess, Ryan J. Drew, H. Dennis Murphy, Thomas E. Yan, Jun Fuhrer, Michael S. Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title | Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title_full | Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title_fullStr | Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title_full_unstemmed | Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title_short | Pulsed Near-IR Photoresponse in a Bi-metal Contacted Graphene Photodetector |
title_sort | pulsed near-ir photoresponse in a bi-metal contacted graphene photodetector |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4594039/ https://www.ncbi.nlm.nih.gov/pubmed/26441034 http://dx.doi.org/10.1038/srep14803 |
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