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First-principles study of rectification in bis-2-(5-ethynylthienyl)ethyne molecular junctions
Shundong Yuan1, Shiyan Wang, Qunbo Mei
1Jiangsu Key Laboratory of Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, People's Republic of China.
Investigating molecular junctions with bis-2-(5-ethynylthienyl)ethyne (BETE), this study found that asymmetric electrode-molecule contacts are crucial for electron transport rectification. Donor-acceptor groups did not significantly enhance this rectifying effect in BETE-based junctions.
Area of Science:
- Molecular electronics
- Quantum transport phenomena
Background:
- Molecular junctions are key components in molecular electronics.
- Understanding electron transport and rectification is crucial for device development.
Purpose of the Study:
- Investigate electron transport and rectification in bis-2-(5-ethynylthienyl)ethyne (BETE) molecular junctions.
- Examine the impact of asymmetric electrode-molecule contacts and donor-acceptor groups on rectification.
Main Methods:
- Density Functional Theory (DFT) combined with Non-Equilibrium Green's Function (NEGF) formalism.
- Computational modeling of BETE-based molecular junctions with varying contact geometries and substituents.
Main Results:
- Asymmetric current-voltage characteristics were observed in junctions with asymmetric contacts and donor-acceptor groups.
- The mode of electrode-molecule contacts significantly influences rectification efficiency.
- Donor-acceptor groups showed limited enhancement of rectification in asymmetric contact junctions.
Conclusions:
- Asymmetric electrode-molecule contacts are the primary factor driving rectification in BETE molecular junctions.
- Further functionalization with donor-acceptor groups offers marginal benefits for rectification when contacts are already asymmetric.
- Transmission spectra and molecular projected self-consistent Hamiltonian (MPSH) states explain observed rectifying behaviors.
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