Hot-Carrier Seebeck Effect : Diffusion and Remote Detection of Hot Carriers in Graphene

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(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)

Data:	2015
Resum:	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.
Ajuts:	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
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Graphene ; Seebeck effect ; Hot carriers ; Electron-phonon interaction ; Supercollisions
Publicat a:	Nano letters, Vol. 15, Issue 6 (June 2015) , p. 4000-4005, ISSN 1530-6992

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Registre creat el 2019-09-23, darrera modificació el 2022-09-10