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Description:

Finding new optoelectronic mechanisms that overcome the limitations of conventional semiconductor devices is paramount for detecting and harvesting low-energy photons. A highly promising approach is to drive a current from the thermal energy added to the free-electron bath as a result of light absorption. Successful implementation of this strategy requires a broadband absorber where carriers interact among themselves more strongly than with phonons, as well as energy-selective contacts to extract the excess electronic heat. Here we show that graphene-WSe2-graphene heterostructure devices offer this possibility through the photo-thermionic effect: the absorbed photon energy in graphene is efficiently transferred to the electron bath, leading to a thermalized 'hot' carrier distribution.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Optoelectronic mechanisms, graphene, photo-thermionic effect

Date published: 2016-07-14

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 7 12174

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/ncomms12174

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Updated at: 2025-02-27 12:30:35 +0900

Published on MDR: 2025-02-27 12:30:35 +0900