Journal
ADVANCED MATERIALS
Volume 31, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901351
Keywords
active clusters; heterostructures; kinetics; metal; chalcogenide ratio; nucleation
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Funding
- National Natural Science Foundation of China [51525202, 61574054, 51772084, 61505051]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Joint Research Fund for Overseas Chinese, Hong Kong and Macau Scholars of the National Natural Science Foundation of China [61528403]
- Hunan Provincial (China) Natural Science Foundation for Excellent Young Scholars [2019JJ30004]
- Foundation for Innovative Research Groups of NSFC [21521063]
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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.
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