Imperial College London
Alternate

ProfessorStefanMaier

Faculty of Natural Sciences, Department of Physics

Lee-Lucas Chair in Experimental Physics
 
 
 
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Contact

 

+44 (0)20 7594 6063s.maier Website CV

 
 
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Location

 

Huxley 903Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2017:10.1038/ncomms13906,
author = {Wang, L and Wang, Z and Wang, HY and Grinblat, G and Huang, YL and Wang, D and Ye, XH and Li, XB and Bao, Q and Wee, AS and Maier, SA and Chen, QD and Zhong, ML and Qiu, CW and Sun, HB},
doi = {10.1038/ncomms13906},
journal = {Nature Communications},
title = {Slow cooling and efficient extraction of C-exciton hot carriers in MoS2 monolayer},
url = {http://dx.doi.org/10.1038/ncomms13906},
volume = {8},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Wang,L
AU  - Wang,Z
AU  - Wang,HY
AU  - Grinblat,G
AU  - Huang,YL
AU  - Wang,D
AU  - Ye,XH
AU  - Li,XB
AU  - Bao,Q
AU  - Wee,AS
AU  - Maier,SA
AU  - Chen,QD
AU  - Zhong,ML
AU  - Qiu,CW
AU  - Sun,HB
DO  - 10.1038/ncomms13906
PY  - 2017///
SN  - 2041-1723
TI  - Slow cooling and efficient extraction of C-exciton hot carriers in MoS2 monolayer
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/ncomms13906
UR  - http://www.ncbi.nlm.nih.gov/pubmed/28054546
UR  - http://hdl.handle.net/10044/1/43941
VL  - 8
ER  -
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