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Charge transport through single-molecule bilayer-graphene junctions with atomic thickness
Shiqiang Zhao1, Ze-Ying Deng1, Shadiah Albalawi2
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University Xiamen 361005 China whong@xmu.edu.cn yuanzhi_tan@xmu.edu.cn.
Chemical Science
|June 10, 2022
Summary
Van der Waals interactions enable atomic-thickness heterojunctions. Molecular graphene junctions show charge transport depends on graphene size and layer number, tunable via molecular group angles.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Van der Waals (vdW) interactions are crucial for fabricating atomically thin heterojunctions.
- Understanding charge transport in such nanoscale junctions is key for future electronic devices.
Purpose of the Study:
- To fabricate and characterize single-molecule bilayer-graphene junctions using vdW interactions.
- To investigate the influence of molecular graphene size and orientation on cross-plane charge transport.
Main Methods:
- Fabrication of single-molecule bilayer-graphene junctions via vdW assembly.
- Electrical transport measurements using the cross-plane break junction (XPBJ) technique.
- Density Functional Theory (DFT) calculations to analyze charge transport mechanisms.
Main Results:
- Cross-plane charge transport is sensitive to the size and layer number of molecular graphene.
- Molecular orientation, specifically angles between graphene and mesityl groups, significantly impacts conductance.
- DFT confirms that rotating peripheral groups can tune electrical conductance.
Conclusions:
- vdW heterojunctions offer a platform for studying charge transport at the molecular scale.
- Molecular graphene properties and structural configurations dictate charge transport behavior.
- Through-space interactions and molecular design are critical for controlling electronic properties in vdW heterojunctions.
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