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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport

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Effects of contact material on complex excitonic behaviour of monolayer MoS2

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Title
Effects of contact material on complex excitonic behaviour of monolayer MoS2
Author
Park, YoungsinChoi, Soo HoLee, GeunsikYang, WoochulIm, Hyunsik
Issue Date
2018-10
Publisher
ELSEVIER SCIENCE BV
Citation
OPTICAL MATERIALS, v.84, pp.870 - 873
Abstract
We investigated the optical behaviour of excitons in monolayer MoS2 prepared on a 60 nm-thick metal (Au) ring structure patterned on SiO2. CVD-grown monolayer MoS2 was transferred to the metal structure and placed in contact with three different environments simultaneously: SiO2, Au metal and air. The optical properties of the transferred MoS2 on the substrates were characterized through micro-photoluminescence (μ-PL) measurements. PL peaks were observed near ∼1.82 eV for defect-related emission, ∼1.92 eV for an A exciton, which includes a neutral exciton and a trion, and ∼2.1 eV for a B exciton. The optical band gap and exciton-phonon interaction of the samples on the three substrates were investigated by measuring the temperature-dependent photoluminescence.
URI
https://scholarworks.unist.ac.kr/handle/201301/24559
URL
https://www.sciencedirect.com/science/article/pii/S0925346718305573
DOI
10.1016/j.optmat.2018.08.019
ISSN
0925-3467
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