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Adv Mater. 2019 May 16:e1901351. doi: 10.1002/adma.201901351. [Epub ahead of print]

Rational Kinetics Control toward Universal Growth of 2D Vertically Stacked Heterostructures.

Author information

1
Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, School of Physics and Electronic Science, Hunan University, Changsha, Hunan, 410082, China.
2
College of Materials Science and Engineering, Hunan University, Changsha, Hunan, 410082, China.
3
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA.

Abstract

The rational control of the nucleation and growth kinetics to enable the growth of 2D vertical heterostructure remains a great challenge. Here, an in-depth study is provided toward understanding the growth mechanism of transition metal dichalcogenides (TMDCs) vertical heterostructures in terms of the nucleation and kinetics, where active clusters with a high diffusion barrier will induce the nucleation on top of the TMDC templates to realize vertical heterostructures. Based on this mechanism, in the experiment, through rational control of the metal/chalcogenide ratio in the vapor precursors, effective manipulation of the diffusion barrier of the active clusters and precise control of the heteroepitaxy direction are realized. In this way, a family of vertical TMDCs heterostructures is successfully designed. Optical studies and scanning transmission electron microscopy investigations exhibit that the resulting heterostructures possess atomic sharp interfaces without apparent alloying and defects. This study provides a deep understanding regarding the growth mechanism in terms of the nucleation and kinetics and the robust growth of 2D vertical heterostructures, defining a versatile material platform for fundamental studies and potential device applications.

KEYWORDS:

active clusters; heterostructures; kinetics; metal/chalcogenide ratio; nucleation

PMID:
31095803
DOI:
10.1002/adma.201901351

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