Saigal, Nihit, Wielert, Isabelle, Capeta, Davor, Vujicic, Natasa, Senkovskiy, Boris V., Hell, Martin, Kralj, Marko and Gruneis, Alexander (2018). Effect of lithium doping on the optical properties of monolayer MoS2. Applied Physics Letters, 112 (12). p. 121902. AIP Publishing. ISSN 0003-6951

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Abstract

The effect of lithium atoms' evaporation on the surface of monolayer MoS2 grown on SiO2/Si substrate is studied using ultrahigh vacuum (∼10−11 mbar) Raman and circularly polarized photoluminescence spectroscopies, at low lithium coverage (up to ∼0.17 monolayer). With increasing Li doping, the dominant E12g and A1g Raman modes of MoS2 shift in energy and broaden. Additionally, non zone-center phonon modes become Raman active. This regards, in particular, to double resonance Raman scattering processes, involving longitudinal acoustic phonon modes at the M and K points of the Brillouin zone of MoS2 and defects. It is also accompanied by a significant decrease in the overall intensity and the degree of circular polarization of the photoluminescence spectrum. The observed changes in the optical spectra are understood as a result of electron doping by lithium atoms and disorder-activated intervalley scattering of electrons and holes in the electronic band structure of monolayer MoS2.

Item Type: Journal Article
Creators:
CreatorsEmailORCID
Saigal, NihitUNSPECIFIEDUNSPECIFIED
Wielert, IsabelleUNSPECIFIEDUNSPECIFIED
Capeta, DavorUNSPECIFIEDUNSPECIFIED
Vujicic, NatasaUNSPECIFIEDUNSPECIFIED
Senkovskiy, Boris V.UNSPECIFIEDUNSPECIFIED
Hell, MartinUNSPECIFIEDUNSPECIFIED
Kralj, MarkoUNSPECIFIEDUNSPECIFIED
Gruneis, AlexanderUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-81603
DOI: 10.1063/1.5021629
Journal or Publication Title: Applied Physics Letters
Publisher: AIP Publishing
ISSN: 0003-6951
Volume: 112
Number: 12
Subjects: Natural sciences and mathematics
Physics
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Institute of Physics II
Language: English
Date: March 2018
Funders: ERC Grant No. 648589 “SUPER-2D,”, DFG Project CRC 1238, DFG Project GR 3708/2-1, Croatian Science Foundation (Grant No. IP-2016-06-3211)
Refereed: Yes
Page Range: p. 121902
URI: http://kups.ub.uni-koeln.de/id/eprint/8160

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