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Observation of ultrafast free carrier dynamics in single layer MoS2

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King_2015_NL_Observation_AM.pdf (713.0Kb)
Date
09/09/2015
Author
Cabo, Antonija
Miwa, Jill
Grønborg, Signe
Riley, Jonathon Mark
Johannsen, Jens
Cacho, Cephise
Alexander, Oliver
Chapman, Richard
Springate, Emma
Grioni, Marco
Lauritsen, Jeppe
King, Phil
Hofmann, Philip
Ulstrup, Søren
Keywords
Transition metal dichalcogenides
MoS2
Free carriers
Exitons
Time- and angle-resolved photoemission spectroscopy
QC Physics
DAS
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Abstract
The dynamics of excited electrons and holes in single layer (SL) MoS2 have so far been difficult to disentangle from the excitons that dominate the optical response of this material. Here, we use time- and angle-resolved photoemission spectroscopy for an SL of MoS2 on a metallic substrate to directly measure the excited free carriers. This allows us to ascertain a direct quasiparticle band gap of 1.95 eV and determine an ultrafast (50 fs) extraction of excited free carriers via the metal in contact with the SL MoS2. This process is of key importance for optoelectronic applications that rely on separated free carriers rather than excitons.
Citation
Cabo , A , Miwa , J , Grønborg , S , Riley , J M , Johannsen , J , Cacho , C , Alexander , O , Chapman , R , Springate , E , Grioni , M , Lauritsen , J , King , P , Hofmann , P & Ulstrup , S 2015 , ' Observation of ultrafast free carrier dynamics in single layer MoS 2 ' , Nano Letters , vol. 15 , no. 9 , pp. 5883–5887 . https://doi.org/10.1021/acs.nanolett.5b01967
Publication
Nano Letters
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.nanolett.5b01967
ISSN
1530-6984
Type
Journal item
Rights
Copyright © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see https://dx.doi.org/10.1021/acs.nanolett.5b01967
Description
The authors gratefully acknowledge funding from the VILLUM foundation, the Lundbeck foundation, Haldor Topsøe A/S, the Danish Strategic Research Council (CAT-C), EPSRC (Grant Nos. EP/I031014/1 and EP/L505079/1), The Royal Society, and the Swiss National Science Foundation (NSF). Ph.H. and S.U. acknowledge financial support from the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant Nos. DFF-4002-00029 and DFF-4090-00125). Date of Accepted 19/08/2015
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/9344

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