Photoexcitation cascade and multiple hot-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 |
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Springer Nature
2019
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| Online Access: | https://hdl.handle.net/1721.1/121258 |
| _version_ | 1810987613524328448 |
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| author | Tielrooij, K. J. Song, J. C. W. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Levitov, Leonid Koppens, F. H. L. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Tielrooij, K. J. Song, J. C. W. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Levitov, Leonid Koppens, F. H. L. |
| 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 | 2024-09-23T11:52:54Z |
| format | Article |
| id | mit-1721.1/121258 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:52:54Z |
| publishDate | 2019 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | mit-1721.1/1212582022-09-27T22:34:56Z Photoexcitation cascade and multiple hot-carrier generation in graphene Tielrooij, K. J. Song, J. C. W. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Levitov, Leonid Koppens, F. H. L. Massachusetts Institute of Technology. Department of Physics 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) 2019-06-12T17:54:32Z 2019-06-12T17:54:32Z 2013-02 2012-10 2019-03-29T15:05:16Z Article http://purl.org/eprint/type/JournalArticle 1745-2473 1745-2481 https://hdl.handle.net/1721.1/121258 Tielrooij, K. J. et al. “Photoexcitation Cascade and Multiple Hot-Carrier Generation in Graphene.” Nature Physics 9, n4 (February 2013): 248–252 © 2013 Macmillan Publishers Limited http://dx.doi.org/10.1038/NPHYS2564 Nature Physics http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Springer Nature arXiv |
| spellingShingle | Tielrooij, K. J. Song, J. C. W. Jensen, S. A. Centeno, A. Pesquera, A. Zurutuza Elorza, A. Bonn, M. Levitov, Leonid Koppens, F. H. L. Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title | Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title_full | Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title_fullStr | Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title_full_unstemmed | Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title_short | Photoexcitation cascade and multiple hot-carrier generation in graphene |
| title_sort | photoexcitation cascade and multiple hot carrier generation in graphene |
| url | https://hdl.handle.net/1721.1/121258 |
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