Hot-Carrier Seebeck Effect : Diffusion and Remote Detection of Hot Carriers in Graphene
Sierra, Juan F. (Institut Català de Nanociència i Nanotecnologia)
Neumann, Ingmar (Institut Català de Nanociència i Nanotecnologia)
Costache, Marius Vasile. (Institut Català de Nanociència i Nanotecnologia)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)

Date:	2015
Abstract:	We investigate hot carrier propagation across graphene using an electrical nonlocal injection/detection method. The device consists of a monolayer graphene flake contacted by multiple metal leads. Using two remote leads for electrical heating, we generate a carrier temperature gradient that results in a measurable thermoelectric voltage V across the remaining (detector) leads. Due to the nonlocal character of the measurement, V is exclusively due to the Seebeck effect. Remarkably, a departure from the ordinary relationship between Joule power P and V, V ∼ P, becomes readily apparent at low temperatures, representing a fingerprint of hot-carrier dominated thermoelectricity. By studying V as a function of bias, we directly determine the carrier temperature and the characteristic cooling length for hot-carrier propagation, which are key parameters for a variety of new applications that rely on hot-carrier transport.
Grants:	European Commission 308023 Ministerio de Economía y Competitividad MAT2013-46785-P Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad JCI-2012-12661 Ministerio de Economía y Competitividad RYC-2011-08319
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Graphene ; Seebeck effect ; Hot carriers ; Electron-phonon interaction ; Supercollisions
Published in:	Nano letters, Vol. 15, Issue 6 (June 2015) , p. 4000-4005, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.5b00922

Postprint 23 p, 2.0 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
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