Hot Carrier Transport and Photocurrent Response in Graphene
Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of h...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Chemical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/73958 https://orcid.org/0000-0002-4268-731X |
| _version_ | 1826198253995032576 |
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| author | Song, Justin Chien Wen Rudner, Mark S. Marcus, Charles M. Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Song, Justin Chien Wen Rudner, Mark S. Marcus, Charles M. Levitov, Leonid |
| author_sort | Song, Justin Chien Wen |
| collection | MIT |
| description | Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers. The hot-carrier-mediated energy transport dominates the photoresponse and manifests itself in quantum efficiencies that can exceed unity, as well as in a characteristic dependence of the photocurrent on gate voltages. The pattern of multiple photocurrent sign changes as a function of gate voltage provides a fingerprint of hot-carrier-dominated transport and carrier multiplication. |
| first_indexed | 2024-09-23T11:01:49Z |
| format | Article |
| id | mit-1721.1/73958 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:01:49Z |
| publishDate | 2012 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | mit-1721.1/739582022-10-01T00:39:05Z Hot Carrier Transport and Photocurrent Response in Graphene Song, Justin Chien Wen Rudner, Mark S. Marcus, Charles M. Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Levitov, Leonid Levitov, Leonid Song, Justin Chien Wen Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers. The hot-carrier-mediated energy transport dominates the photoresponse and manifests itself in quantum efficiencies that can exceed unity, as well as in a characteristic dependence of the photocurrent on gate voltages. The pattern of multiple photocurrent sign changes as a function of gate voltage provides a fingerprint of hot-carrier-dominated transport and carrier multiplication. United States. Office of Naval Research (Naval Research Grant N00014-09-1-0724) Nature Society (Singapore) 2012-10-15T14:43:44Z 2012-10-15T14:43:44Z 2011-09 2011-09 Article http://purl.org/eprint/type/JournalArticle 1530-6984 1530-6992 http://hdl.handle.net/1721.1/73958 Song, Justin C. W. et al. “Hot Carrier Transport and Photocurrent Response in Graphene.” Nano Letters 11.11 (2011): 4688–4692. Web. https://orcid.org/0000-0002-4268-731X en_US http://dx.doi.org/10.1021/nl202318u Nano Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Chemical Society Prof Levitov via Mat Willmott |
| spellingShingle | Song, Justin Chien Wen Rudner, Mark S. Marcus, Charles M. Levitov, Leonid Hot Carrier Transport and Photocurrent Response in Graphene |
| title | Hot Carrier Transport and Photocurrent Response in Graphene |
| title_full | Hot Carrier Transport and Photocurrent Response in Graphene |
| title_fullStr | Hot Carrier Transport and Photocurrent Response in Graphene |
| title_full_unstemmed | Hot Carrier Transport and Photocurrent Response in Graphene |
| title_short | Hot Carrier Transport and Photocurrent Response in Graphene |
| title_sort | hot carrier transport and photocurrent response in graphene |
| url | http://hdl.handle.net/1721.1/73958 https://orcid.org/0000-0002-4268-731X |
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