Tailoring
Domain Morphology in Monolayer NbSe2 and WxNb1–xSe2 Heterostructure
Posted on 2020-06-19 - 12:34
Domain morphology plays a pivotal
role not only for the synthesis of high-quality 2D transition metal
dichalcogenides (TMDs) but also for the further unveiling of related
physical and chemical properties, yet little has been divulged to
date, especially for metallic TMDs. In addition, solid precursor as
a transition metal source has been conventionally introduced for the
synthesis of TMDs, which leads to an inhomogeneous distribution of
local domains with the substrate position, making it difficult to
obtain a reliable film. Here, we tailor the domain morphologies of
metallic NbSe2 and NbSe2/WSe2 heterostructures
using liquid-precursor chemical vapor deposition (CVD). We find that
triangular, hexagonal, tripod-like, and herringbone-like NbSe2 flakes are constructed through control of growth temperature
and promoter and precursor concentration. Liquid-precursor CVD ensures
domain morphologies that are highly reproducible over repeated growth
and uniform along the gas-flow direction. A domain coverage of ∼80%
is achieved at a high precursor concentration, starting with tripod-like
NbSe2 domain and evolving to the herringbone fractal. Furthermore,
mixing liquid W and Nb precursors results in sea-urchin-like heterostructure
domains with long-branch-shaped NbSe2 at low temperature,
whereas protruded hexagonal heterostructure domains grow at high temperature.
Our liquid precursor approach provides a shortcut for tailoring the
domain morphologies of metallic TMDs as well as metal/semiconductor
heterostructures.
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Park, Sehwan; Yun, Seok Joon; Kim, Yong In; Kim, Jung Ho; Kim, Young-Min; Kim, Ki Kang; et al. (2020). Tailoring
Domain Morphology in Monolayer NbSe2 and WxNb1–xSe2 Heterostructure. ACS Publications. Collection. https://doi.org/10.1021/acsnano.0c03382
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AUTHORS (7)
SP
Sehwan Park
SY
Seok Joon Yun
YK
Yong In Kim
JK
Jung Ho Kim
YK
Young-Min Kim
KK
Ki Kang Kim
YL
Young Hee Lee
KEYWORDS
Tailoring Domain Morphologytransition metal sourcelong-branch-shaped NbSe 2Monolayer NbSe 22 D transition metal dichalcogenidesTMDtripod-like NbSe 2 domainNb precursors resultssea-urchin-like heterostructure domainsdomain morphologiesliquid-precursor chemical vapor depositionCVDherringbone-like NbSe 2 flakesprecursor concentration