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Temperature dependence of optical properties of monolayer WS2 by spectroscopic ellipsometry

Cited 20 time in Web of Science Cited 21 time in Scopus
Authors

Hoang Tung Nguyen; Kim, Tae Jung; Park, Han Gyeol; Van Long Le; Nguyen, Xuan Au; Koo, Dohyoung; Lee, Chul-Ho; Cuong, Do Duc; Hong, Soon Cheol; Kim, Young Dong

Issue Date
2020-05
Publisher
Elsevier BV
Citation
Applied Surface Science, Vol.511, p. 145503
Abstract
The complex dielectric function epsilon = epsilon(1) + i epsilon(2) of monolayer tungsten disulfide (WS2) is investigated for the energy range from 1.5 to 6.0 eV and temperatures from 41 to 300 K. Measurements were performed under ultra-high vacuum conditions to avoid degradation and overlayer contamination. Fourteen critical-point (CP) energies were observed and their origins in Brillouin-zone were identified by band structure calculations. At low temperature the A and B excitonic peaks split into four CPs, which is understood as the neutral and charged exciton states of monolayer WS2. At low temperatures the CP energies show blue shifts with enhanced structure due to the reduction of electron-phonon interaction. The temperature dependence of these data was obtained by a phenomenological expression with Bose-Einstein statistical factor.
ISSN
0169-4332
URI
https://hdl.handle.net/10371/202252
DOI
https://doi.org/10.1016/j.apsusc.2020.145503
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area 2차원 반도체 소자 및 재료, High-Performance 2D Electronics, Low-Power 2D Electronics, 뉴로모픽 소자 및 응용기술, 저전력 소자 및 소자물리

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