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Carbon nanotube Schottky diode: an atomic perspective
1Nanoelectronics Research Group, Institute of High Performance Computing, 117528, Singapore.
Nanotechnology
|July 7, 2011
Summary
This study explores semiconducting carbon nanotube (SCNT) Schottky diodes, finding that contact geometry and SCNT diameter significantly influence electron transport and rectification. The metal-SCNT interface shows surprisingly high conductivity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Schottky diodes are crucial electronic components.
- Semiconducting carbon nanotubes (SCNTs) offer unique electronic properties for diode applications.
- Understanding electron transport in SCNT Schottky diodes is key for device optimization.
Purpose of the Study:
- To investigate the electron transport properties of SCNT Schottky diodes using atomic modeling.
- To elucidate the factors governing rectification behavior and threshold voltage.
- To explore methods for improving diode performance through structural modifications.
Main Methods:
- Utilizing density functional theory (DFT) for atomic-scale modeling.
- Employing the non-equilibrium Green's function (NEGF) method for electron transport calculations.
- Simulating SCNT Schottky diodes with SCNT embedded in metal electrodes.
Main Results:
- Rectification behavior is primarily attributed to asymmetric electron transmission in conduction and valence bands.
- Changing metal-SCNT contact geometries enhances diode rectification.
- Threshold voltage is tunable via the Schottky barrier height, influenced by SCNT diameter.
- The metal-SCNT contact region demonstrates higher conductivity than anticipated.
Conclusions:
- SCNT Schottky diode performance is highly sensitive to metal-SCNT contact geometry and SCNT diameter.
- Atomic modeling provides crucial insights into electron transport mechanisms in SCNT diodes.
- The findings suggest pathways for designing improved SCNT-based electronic devices.
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