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Performance analysis of a Ge/Si core/shell nanowire field-effect transistor
Gengchiau Liang1, Jie Xiang, Neerav Kharche
1School of Electrical and Computer Engineering and Network for Computational Nanotechnology, Purdue University, West Lafayette, Indiana 47907, USA. elelg@nus.edu.sg
Nano Letters
|March 1, 2007
Summary
This study analyzes germanium/silicon core/shell nanowire transistor performance using advanced modeling. The experimental device operates near the ballistic limit, highlighting potential for future nanoscale electronics.
Area of Science:
- Nanotechnology
- Solid-state physics
- Materials science
Background:
- Germanium/silicon (Ge/Si) core/shell nanowires are promising for next-generation transistors.
- Understanding their transport properties is crucial for device optimization.
Purpose of the Study:
- To analyze the performance of a Ge/Si core/shell nanowire transistor.
- To compare experimental results with theoretical ballistic transport models.
Main Methods:
- Utilized a semiclassical, ballistic transport model.
- Employed an sp3d5s* tight-binding treatment for electronic structure calculations.
- Accounted for series resistance in performance comparisons.
Main Results:
- The experimental device operates at 60-85% of the ballistic limit.
- 14-18 modes are occupied at room temperature for a 15 nm diameter Ge nanowire.
- True 1D transport requires nanowire diameters below approximately 5 nm.
Conclusions:
- The developed methodology enables effective analysis and comparison of various nanowire transistors.
- Ge/Si nanowire transistors show near-ballistic performance, indicating high potential.
- Further miniaturization is needed to achieve true one-dimensional transport.
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