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Slow cooling and efficient extraction of C-exciton hot carriers in MoS2 monolayer

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Title: Slow cooling and efficient extraction of C-exciton hot carriers in MoS2 monolayer
Authors: Wang, L
Wang, Z
Wang, HY
Grinblat, G
Huang, YL
Wang, D
Ye, XH
Li, XB
Bao, Q
Wee, AS
Maier, SA
Chen, QD
Zhong, ML
Qiu, CW
Sun, HB
Item Type: Journal Article
Abstract: In emerging optoelectronic applications, such as water photolysis, exciton fission and novel photovoltaics involving low-dimensional nanomaterials, hot-carrier relaxation and extraction mechanisms play an indispensable and intriguing role in their photo-electron conversion processes. Two-dimensional transition metal dichalcogenides have attracted much attention in above fields recently; however, insight into the relaxation mechanism of hot electron-hole pairs in the band nesting region denoted as C-excitons, remains elusive. Using MoS2 monolayers as a model two-dimensional transition metal dichalcogenide system, here we report a slower hot-carrier cooling for C-excitons, in comparison with band-edge excitons. We deduce that this effect arises from the favourable band alignment and transient excited-state Coulomb environment, rather than solely on quantum confinement in two-dimension systems. We identify the screening-sensitive bandgap renormalization for MoS2 monolayer/graphene heterostructures, and confirm the initial hot-carrier extraction for the C-exciton state with an unprecedented efficiency of 80%, accompanied by a twofold reduction in the exciton binding energy.
Issue Date: 5-Jan-2017
Date of Acceptance: 9-Nov-2016
URI: http://hdl.handle.net/10044/1/43941
DOI: http://dx.doi.org/10.1038/ncomms13906
ISSN: 2041-1723
Publisher: Nature Publishing Group
Journal / Book Title: Nature Communications
Volume: 8
Copyright Statement: © 2017 The Authors.This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: The Leverhulme Trust
The Royal Society
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: F/07 058/BK
Keywords: MD Multidisciplinary
Publication Status: Published
Conference Place: England
Article Number: 13906
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences