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 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.
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Effect of lithium doping on the optical properties of monolayer MoS2
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19 March 2018
Research Article|
March 20 2018
Effect of lithium doping on the optical properties of monolayer MoS2
Nihit Saigal
;
Nihit Saigal
a)
1
II. Physikalisches Institut, Universität zu Köln
, Zülpicher Strasse 77, 50937 Köln, Germany
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Isabelle Wielert;
Isabelle Wielert
1
II. Physikalisches Institut, Universität zu Köln
, Zülpicher Strasse 77, 50937 Köln, Germany
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Davor Čapeta;
Davor Čapeta
2
Center for Excellence for Advanced Materials and Sensing Devices, Institute of Physics
, Bijenička 46, 10000 Zagreb, Croatia
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Nataša Vujičić;
Nataša Vujičić
2
Center for Excellence for Advanced Materials and Sensing Devices, Institute of Physics
, Bijenička 46, 10000 Zagreb, Croatia
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Boris V. Senkovskiy
;
Boris V. Senkovskiy
1
II. Physikalisches Institut, Universität zu Köln
, Zülpicher Strasse 77, 50937 Köln, Germany
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Martin Hell;
Martin Hell
1
II. Physikalisches Institut, Universität zu Köln
, Zülpicher Strasse 77, 50937 Köln, Germany
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Marko Kralj
;
Marko Kralj
2
Center for Excellence for Advanced Materials and Sensing Devices, Institute of Physics
, Bijenička 46, 10000 Zagreb, Croatia
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Alexander Grüneis
Alexander Grüneis
1
II. Physikalisches Institut, Universität zu Köln
, Zülpicher Strasse 77, 50937 Köln, Germany
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a)
Electronic mail: [email protected]
Appl. Phys. Lett. 112, 121902 (2018)
Article history
Received:
January 06 2018
Accepted:
March 06 2018
Citation
Nihit Saigal, Isabelle Wielert, Davor Čapeta, Nataša Vujičić, Boris V. Senkovskiy, Martin Hell, Marko Kralj, Alexander Grüneis; Effect of lithium doping on the optical properties of monolayer MoS2. Appl. Phys. Lett. 19 March 2018; 112 (12): 121902. https://doi.org/10.1063/1.5021629
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