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dc.contributor.authorTielrooij, K. J.
dc.contributor.authorPiatkowski, L.
dc.contributor.authorMassicotte, M.
dc.contributor.authorWoessner, Achim
dc.contributor.authorMa, Q.
dc.contributor.authorLee, Y.
dc.contributor.authorMyhro, K. S.
dc.contributor.authorLau, C. N.
dc.contributor.authorJarillo-Herrero, P.
dc.contributor.authorHulst, N. F. van
dc.contributor.authorKoppens, Frank H. L.
dc.contributor.otherUniversitat Politècnica de Catalunya. Institut de Ciències Fotòniques
dc.date.accessioned2015-08-04T09:18:04Z
dc.date.available2015-10-13T00:30:48Z
dc.date.issued2015-04-13
dc.identifier.issn1748-3387
dc.identifier.urihttp://hdl.handle.net/2117/76494
dc.description.abstractGraphene is a promising material for ultrafast and broadband photodetection. Earlier studies have addressed the general operation of graphene-based photothermoelectric devices and the switching speed, which is limited by the charge carrier cooling time, on the order of picoseconds. However, the generation of the photovoltage could occur at a much faster timescale, as it is associated with the carrier heating time. Here, we measure the photovoltage generation time and find it to be faster than 50 fs. As a proof-of-principle application of this ultrafast photodetector, we use graphene to directly measure, electrically, the pulse duration of a sub-50 fs laser pulse. The observation that carrier heating is ultrafast suggests that energy from absorbed photons can be efficiently transferred to carrier heat. To study this, we examine the spectral response and find a constant spectral responsivity of between 500 and 1,500 nm. This is consistent with efficient electron heating. These results are promising for ultrafast femtosecond and broadband photodetector applications.
dc.format.extent7 p.
dc.language.isoeng
dc.publisherNature
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.lcshgraphene
dc.subject.othergraphene
dc.titleGeneration of photovoltage in graphene on a femtosecond timescale through efficient carrier heating
dc.typeArticle
dc.subject.lemacGrafè
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.nature.com/nnano/journal/v10/n5/full/nnano.2015.54.html
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/294056/EU/Graphene Nano-Photonics/GRANOP
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/604391/EU/Graphene-Based Revolutions in ICT And Beyond/GRAPHENE
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/307806/EU/Tunable light tightly bound to a single sheet of carbon atoms: graphene as a novel platform for nano-optoelectronics/CARBONLIGHT
local.citation.publicationNameNature Nanotechnology
local.citation.volume10
local.citation.startingPage437
local.citation.endingPage443
local.personalitzacitaciotrue


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