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dc.contributor.authorMehew, JD
dc.contributor.authorUnal, S
dc.contributor.authorTorres Alonso, E
dc.contributor.authorJones, GF
dc.contributor.authorFadhil Ramadhan, S
dc.contributor.authorCraciun, MF
dc.contributor.authorRusso, S
dc.date.accessioned2017-07-11T08:20:44Z
dc.date.issued2017-04-18
dc.description.abstractThe combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer-scale electronic devices. Presently, long-lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use of large gate-voltage pulses, have been employed to achieve bandwidths suitable for applications such as video-frame-rate imaging. Here, atomically thin graphene-WS2 heterostructure photodetectors encapsulated in an ionic polymer are reported, which are uniquely able to operate at bandwidths up to 1.5 kHz whilst maintaining internal gain as large as 10(6) . Highly mobile ions and the nanometer-scale Debye length of the ionic polymer are used to screen charge traps and tune the Fermi level of the graphene over an unprecedented range at the interface with WS2 . Responsivity R = 10(6) A W(-1) and detectivity D* = 3.8 × 10(11) Jones are observed, approaching that of single-photon counters. The combination of both high responsivity and fast response times makes these photodetectors suitable for video-frame-rate imaging applications.en_GB
dc.description.sponsorshipJ.D.M. acknowledges financial support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Metamaterials (Grant No. EP/L015331/1 ). S.F.R acknowledges financial support from the Higher Committee for Education Development in Iraq (HCED). S.R. and M.F.C. acknowledge financial support from EPSRC (Grant No. EP/J000396/1, EP/K017160/1, EP/K010050/1, EP/G036101/1, EP/M001024/1, and EP/M002438/1) and from Royal Society International Exchanges Scheme 2016/R1.en_GB
dc.identifier.citationVol. 29 (23), article 1700222en_GB
dc.identifier.doi10.1002/adma.201700222
dc.identifier.urihttp://hdl.handle.net/10871/28394
dc.language.isoenen_GB
dc.publisherWileyen_GB
dc.relation.urlhttps://www.ncbi.nlm.nih.gov/pubmed/28418620en_GB
dc.rights© 2017 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en_GB
dc.subjectWS2en_GB
dc.subjectgrapheneen_GB
dc.subjectionic-polymer gatingen_GB
dc.subjectphotodetectorsen_GB
dc.subjectvan der Waals heterostructuresen_GB
dc.titleFast and Highly Sensitive Ionic-Polymer-Gated WS2 -Graphene Photodetectorsen_GB
dc.typeArticleen_GB
dc.date.available2017-07-11T08:20:44Z
exeter.place-of-publicationGermanyen_GB
dc.descriptionThis is the final version of the article. Available from Wiley via the DOI in this record.en_GB
dc.identifier.journalAdvanced Materialsen_GB


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