Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 11, Pages 7396-7402Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00961
Keywords
two-dimensional; molybdenum ditelluride; molybdenum diselenide; molecular beam epitaxy; transmission electron microscopy; variable-range hopping
Funding
- NRI SWAN
- NSF NNCI
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We demonstrate the growth of thin films of molybdenum ditelluride and molybdenum diselenide on sapphire substrates by molecular beam epitaxy. In situ structural and chemical analyses reveal stoichiometric layered film growth with atomically smooth surface morphologies. Film growth along the (001) direction is confirmed by X-ray diffraction, and the crystalline nature of growth in the 2H phase is evident from Raman spectroscopy. Transmission electron microscopy is used to confirm the layered film structure and hexagonal arrangement of surface atoms. Temperature-dependent electrical measurements show an insulating behavior that agrees well with a two-dimensional variable-range hopping model, suggesting that transport in these films is dominated by localized charge-carrier states.
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