Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors

Sanctis, Adolfo De; Jones, Gareth F.; Wehenkel, Dominique J.; Bezares, Francisco; Koppens, Frank H. L.; Craciun, Monica F.; Russo, Saverio

dc.contributor.author	Sanctis, Adolfo De
dc.contributor.author	Jones, Gareth F.
dc.contributor.author	Wehenkel, Dominique J.
dc.contributor.author	Bezares, Francisco
dc.contributor.author	Koppens, Frank H. L.
dc.contributor.author	Craciun, Monica F.
dc.contributor.author	Russo, Saverio
dc.contributor.other	Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques
dc.date.accessioned	2017-06-07T14:54:07Z
dc.date.available	2017-06-07T14:54:07Z
dc.date.issued	2017-05-26
dc.identifier.citation	Sanctis, A. D. [et al.]. Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors. "Scientific Advances", 26 Maig 2017, vol. 3, núm. 5.
dc.identifier.issn	2375-2548
dc.identifier.uri	http://hdl.handle.net/2117/105212
dc.description.abstract	Graphene-based photodetectors have demonstrated mechanical flexibility, large operating bandwidth, and broadband spectral response. However, their linear dynamic range (LDR) is limited by graphene’s intrinsic hot-carrier dynamics, which causes deviation from a linear photoresponse at low incident powers. At the same time, multiplication of hot carriers causes the photoactive region to be smeared over distances of a few micrometers, limiting the use of graphene in high-resolution applications. We present a novel method for engineering photoactive junctions in FeCl3-intercalated graphene using laser irradiation. Photocurrent measured at these planar junctions shows an extraordinary linear response with an LDR value at least 4500 times larger than that of other graphene devices (44 dB) while maintaining high stability against environmental contamination without the need for encapsulation. The observed photoresponse is purely photovoltaic, demonstrating complete quenching of hot-carrier effects. These results pave the way toward the design of ultrathin photodetectors with unprecedented LDR for high-definition imaging and sensing.
dc.language.iso	eng
dc.publisher	Science
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Física
dc.subject.lcsh	Graphene
dc.subject.other	grafè
dc.title	Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors
dc.type	Article
dc.subject.lemac	Grafè
dc.description.peerreviewed	Peer Reviewed
dc.relation.publisherversion	http://advances.sciencemag.org/content/3/5/e1602617/tab-pdf
dc.rights.access	Open Access
dc.description.version	Postprint (published version)
dc.relation.projectid	info:eu-repo/grantAgreement/EC/FP7/613024/EU/GRAPHENE-BASED SINGLE-PHOTON NONLINEAR OPTICAL DEVICES/GRASP
upcommons.citation.published	true
upcommons.citation.publicationName	Scientific Advances
upcommons.citation.volume	3
upcommons.citation.number	5
upcommons.citation.startingPage	e1602617
dc.identifier.pmid	28560334