Universität zu Köln

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:	Article
Creators:	Creators Email ORCID ORCID Put Code Saigal, Nihit UNSPECIFIED UNSPECIFIED UNSPECIFIED Wielert, Isabelle UNSPECIFIED UNSPECIFIED UNSPECIFIED Capeta, Davor UNSPECIFIED UNSPECIFIED UNSPECIFIED Vujicic, Natasa UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, Boris V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hell, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Kralj, Marko UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-81603
Identification Number:	10.1063/1.5021629
Journal or Publication Title:	Applied Physics Letters
Volume:	112
Number:	12
Page Range:	p. 121902
Date:	March 2018
Publisher:	AIP Publishing
ISSN:	0003-6951
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	Natural sciences and mathematics Physics
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
URI:	http://kups.ub.uni-koeln.de/id/eprint/8160