Publication Date:
2017-08-25
Description:
We report a general synthetic strategy for highly robust growth of diverse lateral heterostructures, multiheterostructures, and superlattices from two-dimensional (2D) atomic crystals. A reverse flow during the temperature-swing stage in the sequential vapor deposition growth process allowed us to cool the existing 2D crystals to prevent undesired thermal degradation and uncontrolled homogeneous nucleation, thus enabling highly robust block-by-block epitaxial growth. Raman and photoluminescence mapping studies showed that a wide range of 2D heterostructures (such as WS 2 -WSe 2 and WS 2 -MoSe 2 ), multiheterostructures (such as WS 2 -WSe 2 -MoS 2 and WS 2 -MoSe 2 -WSe 2 ), and superlattices (such as WS 2 -WSe 2 -WS 2 -WSe 2 -WS 2 ) were readily prepared with precisely controlled spatial modulation. Transmission electron microscope studies showed clear chemical modulation with atomically sharp interfaces. Electrical transport studies of WSe 2 -WS 2 lateral junctions showed well-defined diode characteristics with a rectification ratio up to 10 5 .
Keywords:
Physics, Applied, Materials Science
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
,
Geosciences
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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