Photoluminescence wavelength variation of monolayer MoS2 by oxygen plasma treatment

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

doi:10.1016/j.tsf.2015.06.024

Photoluminescence wavelength variation of monolayer MoS₂ by oxygen plasma treatment

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

Sungkyunkwan University
Inje University

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

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 nm in 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.

Original language	English
Pages (from-to)	318-323
Number of pages	6
Journal	Thin Solid Films
Volume	590
DOIs	https://doi.org/10.1016/j.tsf.2015.06.024
State	Published - 1 Sep 2015

Keywords

Confocal absorption microscopy
Confocal photoluminescence microscopy
Molybdenum disulfide
Oxygen plasma
Wavelength tuning

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10.1016/j.tsf.2015.06.024

Cite this

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title = "Photoluminescence wavelength variation of monolayer MoS2 by oxygen plasma treatment",

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 \textasciitilde{} 20 nm in 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.",

keywords = "Confocal absorption microscopy, Confocal photoluminescence microscopy, Molybdenum disulfide, Oxygen plasma, Wavelength tuning",

author = "Kim, \{Min Su\} and Giwoong Nam and Seki Park and Hyun Kim and Han, \{Gang Hee\} and Jubok Lee and Dhakal, \{Krishna P.\} and Leem, \{Jae Young\} and Lee, \{Young Hee\} and Jeongyong Kim",

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year = "2015",

month = sep,

day = "1",

doi = "10.1016/j.tsf.2015.06.024",

language = "English",

volume = "590",

pages = "318--323",

journal = "Thin Solid Films",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Photoluminescence wavelength variation of monolayer MoS2 by oxygen plasma treatment

AU - Kim, Min Su

AU - Nam, Giwoong

AU - Park, Seki

AU - Kim, Hyun

AU - Han, Gang Hee

AU - Lee, Jubok

AU - Dhakal, Krishna P.

AU - Leem, Jae Young

AU - Lee, Young Hee

AU - Kim, Jeongyong

PY - 2015/9/1

Y1 - 2015/9/1

N2 - 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 nm in 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.

AB - 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 nm in 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.

KW - Confocal absorption microscopy

KW - Confocal photoluminescence microscopy

KW - Molybdenum disulfide

KW - Oxygen plasma

KW - Wavelength tuning

UR - https://www.scopus.com/pages/publications/84941420430

U2 - 10.1016/j.tsf.2015.06.024

DO - 10.1016/j.tsf.2015.06.024

M3 - Article

AN - SCOPUS:84941420430

SN - 0040-6090

VL - 590

SP - 318

EP - 323

JO - Thin Solid Films

JF - Thin Solid Films

ER -

Photoluminescence wavelength variation of monolayer MoS₂ by oxygen plasma treatment

Abstract

Keywords

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