Na2SO4‑Regulated High-Quality
Growth of Transition Metal Dichalcogenides by Controlling Diffusion
Posted on 2020-06-16 - 19:10
The
high diffusion rate of sulfur with respect to metal oxide creates
precursors that deviate from the stoichiometric ratio, leading to
poor growth controllability and defects in the as-grown transition
metal dichalcogenides (TMDCs). The introduction of a sulfur precursor
with a high melting point is a hopeful strategy to solve these problems.
Here, we first introduce sodium sulfate (Na2SO4) as a sulfur precursor, which plays roles in tuning diffusion of
source precursors and balancing their mass flux based on the temperature-confined
decomposition of Na2SO4. We deduced the specific
growth process by characterizing the composition of intermediates;
the results show that emissions of sulfur and metal sources were synchronously
released and spanning the entire growth stage. This temperature-controlled
source-feeding system reduced the diffusion gap between sulfur and
metal, which promoted a faster kinetics for reactions. Moreover, this
method has the wide applicability for producing other TMDCs.
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Jin, Yuanyuan; Cheng, Miao; Liu, Hang; Ouzounian, Miray; Hu, Travis Shihao; You, Bingying; et al. (2020). Na2SO4‑Regulated High-Quality
Growth of Transition Metal Dichalcogenides by Controlling Diffusion. ACS Publications. Collection. https://doi.org/10.1021/acs.chemmater.0c01089
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AUTHORS (13)
YJ
Yuanyuan Jin
MC
Miao Cheng
HL
Hang Liu
MO
Miray Ouzounian
TH
Travis Shihao Hu
BY
Bingying You
GS
Gonglei Shao
XL
Xiao Liu
YL
Yeru Liu
HL
Huimin Li
SL
Shisheng Li
JG
Jie Guan
SL
Song Liu