Formation of Brightly Luminescent MoS 2 Nanoislands from Multilayer Flakes via Plasma Treatment and Laser Exposure

A robust and reliable method for enhancing the photoluminescence (PL) of multilayer MoS2 is demonstrated using an oxygen plasma treatment process followed by laser exposure. Here, the plasma and laser treatments result in an indirect-to-direct band gap transition. The oxygen plasma creates a slight...

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Published in:	ACS omega Vol. 5; no. 32; pp. 20543 - 20547
Main Authors:	Wang, Bo, Yang, Sisi, Wang, Yu, Kim, Younghee, Htoon, Han, Doorn, Stephen K., Foran, Brendan J., Bushmaker, Adam W., Baker, David R., Forcherio, Gregory T., Cronin, Stephen B.
Format:	Journal Article
Language:	English
Published:	United States American Chemical Society (ACS) 18-08-2020
Subjects:	70 PLASMA PHYSICS AND FUSION TECHNOLOGY Lasers Material Science Monolayers Oxygen Plasma Transmission electron microscopy
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Abstract	A robust and reliable method for enhancing the photoluminescence (PL) of multilayer MoS2 is demonstrated using an oxygen plasma treatment process followed by laser exposure. Here, the plasma and laser treatments result in an indirect-to-direct band gap transition. The oxygen plasma creates a slight decoupling of the layers and converts some of the MoS2 to MoO3. Subsequent laser irradiation further oxidizes the MoS2 to MoO3, as confirmed via X-ray photoelectron spectroscopy, and results in localized regions of brightly luminescent MoS2 monolayer triangular islands as seen in high-resolution transmission electron microscopy images. The PL lifetimes are found to decrease from 494 to 190 ps after plasma and laser treatment, reflecting the smaller size of the MoS2 grains/regions. Atomic force microscopic imaging shows a 2 nm increase in thickness of the laser-irradiated regions, which provides further evidence of the MoS2 being converted to MoO3.
AbstractList	A robust and reliable method for enhancing the photoluminescence (PL) of multilayer MoS2 is demonstrated using an oxygen plasma treatment process followed by laser exposure. Here, the plasma and laser treatments result in an indirect-to-direct band gap transition. The oxygen plasma creates a slight decoupling of the layers and converts some of the MoS2 to MoO3. Subsequent laser irradiation further oxidizes the MoS2 to MoO3, as confirmed via X-ray photoelectron spectroscopy, and results in localized regions of brightly luminescent MoS2 monolayer triangular islands as seen in high-resolution transmission electron microscopy images. The PL lifetimes are found to decrease from 494 to 190 ps after plasma and laser treatment, reflecting the smaller size of the MoS2 grains/regions. Atomic force microscopic imaging shows a 2 nm increase in thickness of the laser-irradiated regions, which provides further evidence of the MoS2 being converted to MoO3.
Author	Foran, Brendan J. Baker, David R. Wang, Bo Wang, Yu Cronin, Stephen B. Yang, Sisi Kim, Younghee Forcherio, Gregory T. Htoon, Han Doorn, Stephen K. Bushmaker, Adam W.
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SubjectTerms	70 PLASMA PHYSICS AND FUSION TECHNOLOGY Lasers Material Science Monolayers Oxygen Plasma Transmission electron microscopy
Title	Formation of Brightly Luminescent MoS 2 Nanoislands from Multilayer Flakes via Plasma Treatment and Laser Exposure
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