Photo-excitation Cascade and Multiple Carrier Generation in Graphene
The conversion of light into free electron–hole pairs constitutes the key process in the fields of photodetection and photovoltaics. The efficiency of this process depends on the competition of different relaxation pathways and can be greatly enhanced when photoexcited carriers do not lose energy as...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Nature Publishing Group
2014
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| Online Access: | http://hdl.handle.net/1721.1/88511 https://orcid.org/0000-0002-4268-731X |
| _version_ | 1811097437761175552 |
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| author | Tielrooij, K. J. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Koppens, Frank Henricus Louis Song, Justin Chien Wen Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Tielrooij, K. J. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Koppens, Frank Henricus Louis Song, Justin Chien Wen Levitov, Leonid |
| author_sort | Tielrooij, K. J. |
| collection | MIT |
| description | The conversion of light into free electron–hole pairs constitutes the key process in the fields of photodetection and photovoltaics. The efficiency of this process depends on the competition of different relaxation pathways and can be greatly enhanced when photoexcited carriers do not lose energy as heat, but instead transfer their excess energy into the production of additional electron–hole pairs through carrier–carrier scattering processes. Here we use optical pump–terahertz probe measurements to probe different pathways contributing to the ultrafast energy relaxation of photoexcited carriers. Our results indicate that carrier–carrier scattering is highly efficient, prevailing over optical-phonon emission in a wide range of photon wavelengths and leading to the production of secondary hot electrons originating from the conduction band. As hot electrons in graphene can drive currents, multiple hot-carrier generation makes graphene a promising material for highly efficient broadband extraction of light energy into electronic degrees of freedom, enabling high-efficiency optoelectronic applications. |
| first_indexed | 2024-09-23T16:59:32Z |
| format | Article |
| id | mit-1721.1/88511 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:59:32Z |
| publishDate | 2014 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/885112022-10-03T09:37:23Z Photo-excitation Cascade and Multiple Carrier Generation in Graphene Photoexcitation cascade and multiple hot-carrier generation in graphene Tielrooij, K. J. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Koppens, Frank Henricus Louis Song, Justin Chien Wen Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Song, Justin Chien Wen Levitov, Leonid The conversion of light into free electron–hole pairs constitutes the key process in the fields of photodetection and photovoltaics. The efficiency of this process depends on the competition of different relaxation pathways and can be greatly enhanced when photoexcited carriers do not lose energy as heat, but instead transfer their excess energy into the production of additional electron–hole pairs through carrier–carrier scattering processes. Here we use optical pump–terahertz probe measurements to probe different pathways contributing to the ultrafast energy relaxation of photoexcited carriers. Our results indicate that carrier–carrier scattering is highly efficient, prevailing over optical-phonon emission in a wide range of photon wavelengths and leading to the production of secondary hot electrons originating from the conduction band. As hot electrons in graphene can drive currents, multiple hot-carrier generation makes graphene a promising material for highly efficient broadband extraction of light energy into electronic degrees of freedom, enabling high-efficiency optoelectronic applications. United States. Office of Naval Research (Grant N00014-09-1-0724) 2014-07-28T20:17:38Z 2014-07-28T20:17:38Z 2013-02 2012-10 Article http://purl.org/eprint/type/JournalArticle 1745-2473 1745-2481 http://hdl.handle.net/1721.1/88511 Tielrooij, K. J., J. C. W. Song, S. A. Jensen, A. Centeno, A. Pesquera, A. Zurutuza Elorza, M. Bonn, L. S. Levitov, and F. H. L. Koppens. “Photoexcitation Cascade and Multiple Hot-Carrier Generation in Graphene.” Nat Phys 9, no. 4 (February 24, 2013): 248–252. https://orcid.org/0000-0002-4268-731X en_US http://dx.doi.org/10.1038/nphys2564 Nature Physics 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 Nature Publishing Group arXiv |
| spellingShingle | Tielrooij, K. J. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Koppens, Frank Henricus Louis Song, Justin Chien Wen Levitov, Leonid Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title | Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title_full | Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title_fullStr | Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title_full_unstemmed | Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title_short | Photo-excitation Cascade and Multiple Carrier Generation in Graphene |
| title_sort | photo excitation cascade and multiple carrier generation in graphene |
| url | http://hdl.handle.net/1721.1/88511 https://orcid.org/0000-0002-4268-731X |
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