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나노 구조 물리 연구단
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Composition-Tunable Synthesis of Large-Scale Mo1-xWxS2 Alloys with Enhanced Photoluminescence

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Title
Composition-Tunable Synthesis of Large-Scale Mo1-xWxS2 Alloys with Enhanced Photoluminescence
Author(s)
Juhong Park; Min Su Kim; Bumsu Park; Sang Ho Oh; Shrawan Roy; Jeongyong Kim; Wonbong Choi
Publication Date
2018-06
Journal
ACS NANO, v.12, no.6, pp.6301 - 6309
Publisher
AMER CHEMICAL SOC
Abstract
Alloying two-dimensional transition metal dichalcogenides (2D TMDs) is a promising avenue for band gap engineering. In addition, developing a scalable synthesis process is essential for the practical application of these alloys with tunable band gaps in optoelectronic devices. Here, we report the synthesis of optically uniform and scalable single-layer Mo1-xWxS2, alloys by a two-step chemical vapor deposition (CVD) method followed by a laser thinning process. The amount of W content (x) in the Mo1-xWxS2 alloy is systemically controlled by the co-sputtering technique. The post-laser process allows layer-by-layer thinning of the Mo1-xWxS2 alloys down to a single-layer; such a layer exhibits tunable properties with the optical band gap ranging from 1.871 to 1.971 eV with variation in the W content, x = 0 to 1. Moreover, the predominant exciton complexes, trions, are transitioned to neutral excitons with increasing W concentration; this is attributed to the decrease in excessive charge carriers with an increase in the W content of the alloy. Photoluminescence (PL) and Raman mapping analyses suggest that the laser-thinning of the Mo1-xWxS2 alloys is a self-limiting process caused by heat dissipation to the substrate, resulting in spatially uniform single-layer Mo1-xWxS2 alloy films. Our findings present a promising path for the fabrication of large-scale single-layer 2D TMD alloys and the design of versatile optoelectronic devices © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5561
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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