Effect of lithium doping on the optical properties of monolayer MoS2

被引：25

作者：

Saigal, Nihit ^{[1
]}

Wielert, Isabelle ^{[1
]}

Capeta, Davor ^{[2
]}

Vujicic, Natasa ^{[2
]}

Senkovskiy, Boris V. ^{[1
]}

Hell, Martin ^{[1
]}

Kralj, Marko ^{[2
]}

Grueneis, Alexander ^{[1
]}

机构：

[1] Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany

[2] Ctr Excellence Adv Mat & Sensing Devices, Inst Phys, Bijenicka 46, Zagreb 10000, Croatia

来源：

APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 12期

关键词：

TRANSITION-METAL DICHALCOGENIDES; PHASE-TRANSITION; INTERVALLEY SCATTERING; PHOTOLUMINESCENCE; INTERCALATION; POLARIZATION;

D O I：

10.1063/1.5021629

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of lithium atoms' evaporation on the surface of monolayer MoS2 grown on SiO2/Si substrate is studied using ultrahigh vacuum (similar to 10(-11) mbar) Raman and circularly polarized photoluminescence spectroscopies, at low lithium coverage (up to similar to 0.17 monolayer). With increasing Li doping, the dominant E-2g(1) and A(1g) 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. Published by AIP Publishing.

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页数：5

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