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Twist angle-dependent conductivities across MoS2/graphene heterojunctions.
Mengzhou Liao1,2, Ze-Wen Wu3, Luojun Du1,2
1CAS Key Laboratory of Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Nature Communications
|October 6, 2018
Summary
Twist angle in molybdenum disulfide/graphene heterostructures significantly tunes conductivity. Researchers found conductivity varies by 5x, with optimal performance at 0° twist, offering insights for electronic device design.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Van der Waals heterostructures, formed by stacking 2D materials, are crucial for fundamental physics and advanced device applications.
- The relative twist angle between layers critically influences heterostructure properties.
Purpose of the Study:
- To experimentally investigate the impact of twist angle on conductivity in MoS2/graphene van der Waals heterojunctions.
- To understand the underlying mechanisms governing twist angle-dependent conductivity.
Main Methods:
- Experimental measurement of vertical conductivity in MoS2/graphene heterojunctions across various twist angles.
- Density Functional Theory (DFT) simulations to analyze transmission coefficients.
Main Results:
- Vertical conductivity was tuned by approximately 5 times with varying twist angles.
- Highest conductivity was observed at a 0° twist angle, and lowest at 30°.
- DFT simulations indicated that transmission coefficient differences are responsible for conductivity variations.
Conclusions:
- The twist angle in MoS2/graphene heterojunctions offers a method to control conductivity.
- Findings provide guidance for optimizing MoS2/graphene heterojunctions in electronics, particularly for reducing contact resistance in MoS2 and other TMDCs devices.
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