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나노 구조 물리 연구단
나노구조물리 연구단
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Photoluminescence wavelength variation of monolayer MoS2 by oxygen plasma treatment

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Title
Photoluminescence wavelength variation of monolayer MoS2 by oxygen plasma treatment
Author(s)
Min Su Kim; Giwoong Nam; Seki Park; Hyun Kim; Gang Hee Han; Jubok Lee; Krishna P. Dhakal; Jae-Young Leem; Young Hee Lee; Jeongyong Kim
Publication Date
2015-09
Journal
THIN SOLID FILMS, v.590, no., pp.318 - 323
Publisher
ELSEVIER SCIENCE SA
Abstract
We performed nanoscale confocal photoluminescence (PL), Raman, and absorption spectral imaging measurements to investigate the optical and structural properties of molybdenum disulfide (MoS2) monolayers synthesized by chemical vapor deposition method and subjected to oxygen plasma treatment for 10 to 120 s under high vacuum(1.3 × 10−3 Pa). Oxygen plasma treatment induced red shifts of ~20 nmin the PL emission peaks corresponding to A and B excitons. Similarly, the peak positions corresponding to A and B excitons of the absorption spectra were red-shifted following oxygen plasma treatment. Based on the confocal PL, absorption, and Raman microscopy results, we suggest that the red-shifting of the A and B exciton peaks originated from shallow defect states generated by oxygen plasma treatment.
URI
https://pr.ibs.re.kr/handle/8788114/1889
ISSN
0040-6090
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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