Correlation of Defect-Induced Photoluminescence and Raman Scattering in Monolayer WS2

Correlation of Defect-Induced Photoluminescence and Raman Scattering in Monolayer WS2

Defect investigation in two-dimensional transition-metal dichalcogenides (TMDs) is required because structural defects significantly affect the optical and electrical properties of TMD. Raman scattering can be an essential tool to study the defects in TMD, but defect-related Raman modes have been ra...

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Veröffentlicht in:Journal of physical chemistry. C 2022-04, Vol.126 (16), p.7177-7183
Hauptverfasser: Jeong, Byeong Geun, Lee, Chanwoo, Kim, Sung Hyuk, Yun, Seok Joon, Kim, Dong Hyeon, Lee, Juchan, Lee, Dongki, Kim, Ki Kang, Lim, Seong Chu, Jeong, Mun Seok
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C: Spectroscopy and Dynamics of Nano, Hybrid, and Low-Dimensional Materials
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container_end_page 7183
container_issue 16
container_start_page 7177
container_title Journal of physical chemistry. C
container_volume 126
creator Jeong, Byeong Geun
Lee, Chanwoo
Kim, Sung Hyuk
Yun, Seok Joon
Kim, Dong Hyeon
Lee, Juchan
Lee, Dongki
Kim, Ki Kang
Lim, Seong Chu
Jeong, Mun Seok
description Defect investigation in two-dimensional transition-metal dichalcogenides (TMDs) is required because structural defects significantly affect the optical and electrical properties of TMD. Raman scattering can be an essential tool to study the defects in TMD, but defect-related Raman modes have been rarely studied. Here, we investigated the influence of sulfur vacancies and oxygen substitution on the optical properties of WS2 using the laser irradiation technique. The defect-induced photoluminescence (PL) exhibits distinct features depending on the type of defects, which shows different changes in the intensities and peak positions of the excitons, biexcitons, and defect-bound excitons. Defect-activated Raman modes revealed information about the defects and demonstrated the origin of the alteration in PL. The defect analysis of TMDs based on the correlation between PL and Raman scattering provides a clear understanding of the variations in their optical properties.
doi_str_mv 10.1021/acs.jpcc.2c01264
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title Correlation of Defect-Induced Photoluminescence and Raman Scattering in Monolayer WS2
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