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Updated: Jun 10, 2026
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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
Published on: April 21, 2016
Gate-controlled donor activation in silicon nanowires.
Binghai Yan1, Thomas Frauenheim, Adám Gali
1Bremen Center for Computational Materials Science, Universität Bremen, Am Fallturm 1, 28359 Bremen, Germany. bhyan@bccms.uni-bremen.de
Nano Letters
|August 20, 2010
Summary
Semiconductor nanowires can achieve higher free carrier density by reducing impurity ionization energy. Engineering nanowire cross-sections and doping effectively tunes this energy, boosting device performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Semiconductor nanowires exhibit higher impurity ionization energy than bulk materials due to their surrounding low dielectric constant medium.
- This elevated ionization energy leads to a reduced free carrier density in nanowires, limiting their electronic applications.
Purpose of the Study:
- To propose and investigate a method for reducing impurity ionization energy in semiconductor nanowires.
- To enhance free carrier density and minimize impurity backscattering in nanowires through structural and electrical engineering.
Main Methods:
- Utilizing ab initio calculations within density functional theory (DFT).
- Simulating phosphorus-doped silicon nanowires with specifically engineered cross-sections.
- Analyzing the effects of doping and applied gate voltage on ionization energy.
Main Results:
- A novel method is proposed to reduce impurity ionization energy in nanowires by engineering their cross-section and optimizing doping.
- Demonstrated effective tuning of ionization energy and reduction of impurity backscattering in phosphorus-doped silicon nanowires.
- Achieved a 40% increase in free carrier density in a 15 nm diameter silicon nanowire with a special cross-section, even without advanced doping engineering.
Conclusions:
- Fabricating semiconductor nanowires with special cross-sections offers a viable strategy to lower impurity ionization energy.
- This approach significantly enhances free carrier density, paving the way for high-performance nanowire devices.
- The findings have critical implications for the development of advanced nanowire-based electronic components.
