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Query: UMLS:C0851184 (
thinning
)
11,252
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
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 Mo
1- x
W
x
S
2
alloys by a two-step chemical vapor deposition (CVD) method followed by a laser
thinning
process. The amount of W content ( x) in the Mo
1- x
W
x
S
2
alloy is systemically controlled by the co-sputtering technique. The post-laser process allows layer-by-layer
thinning
of the Mo
1- x
W
x
S
2
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 Mo
1- x
W
x
S
2
alloys is a self-limiting process caused by heat dissipation to the substrate, resulting in spatially uniform single-layer Mo
1- x
W
x
S
2
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.
...
PMID:Composition-Tunable Synthesis of Large-Scale Mo
1- x
W
x
S
2
Alloys with Enhanced Photoluminescence. 2979 25
