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Dirac-cone induced gating enhancement in single-molecule field-effect transistors
Hantao Sun1, Xunshan Liu2, Yanjie Su1
1Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China. smhou@pku.edu.cn jianhui.liao@pku.edu.cn and Centre for Nanoscale Science and Technology, Peking University, Beijing 100871, China.
Nanoscale
|July 4, 2019
Summary
Graphene electrodes enhance single-molecule field-effect transistors (FETs) by leveraging Dirac-cone effects for improved electrostatic gating. This leads to significant conductance modulation, advancing molecular electronics for circuitry applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene electrodes offer potential for stable room-temperature single-molecule field-effect transistors (FETs).
- The influence of graphene's unique band structure on charge transport in single-molecule devices remains unclear.
Purpose of the Study:
- To investigate Dirac-cone induced electrostatic gating effects in single-molecule FETs utilizing graphene electrodes.
- To understand the interplay between molecular orbitals and graphene electronic states under gating.
Main Methods:
- Fabrication of single-molecule FETs with graphene electrodes and a solid-state local bottom gate.
- Utilized a modified single-level model incorporating graphene's linear dispersion near the Dirac point.
Main Results:
- Observed reinforcement between gating of the highest occupied molecular orbital (HOMO) and graphene's density of states at negative gate polarity, enhancing conductance modulation.
- Demonstrated opposing gating effects on HOMO and graphene states at positive gate polarity, leading to varied conductance changes.
- Achieved high performance with current modulation over one order of magnitude.
Conclusions:
- Graphene's Dirac-cone effect significantly enhances electrostatic gating in single-molecule FETs.
- Graphene is a promising electrode material for molecular devices, enabling advanced circuitry applications.
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