Continuous Template Growth of Large-Scale Tellurene Films on 1T'-MoTe₂

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Template-assisted synthesis enables controlled growth of 2D materials.
• Transition metal dichalcogenides (TMDs) like WTe2 serve as effective templates for oriented 2D material growth.
• Achieving large-area, well-oriented tellurene films remains a challenge.

Purpose of the Study:

• To report the continuous synthesis of large-area, well-oriented tellurene films.
• To investigate the growth mechanism of tellurene on a 1T andomIndex'-MoTe2 template.
• To characterize the electronic properties of the synthesized tellurene films.

Main Methods:

• Continuous synthesis of 1T andomIndex'-MoTe2 template via chemical vapor deposition (CVD).
• Tellurene synthesis via vapor transport on the MoTe2 template.
• Characterization using scanning electron microscopy (SEM), atomic force microscopy (AFM), cross-sectional transmission electron microscopy (TEM), and terahertz (THz) spectroscopy.

Main Results:

• Enhanced lateral growth of tellurene ribbons (approx. 6x faster than vertical growth) facilitated by interaction with the 1T andomIndex'-MoTe2 template.
• Observation of a consistent 60-degree incline at the edges of tellurene ribbons, indicating a specific growth mechanism.
• Achieved hole mobility of ~400 cm2/V s and a current on/off ratio of ~10^3 after template removal.

Conclusions:

• The 1T andomIndex'-MoTe2 template effectively promotes continuous, large-area synthesis of oriented tellurene films.
• The unique growth mechanism involving ribbon collapse and edge-templated stacking is elucidated.
• The synthesized tellurene films exhibit promising electronic properties for device applications.