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Boosting Hole Mobility in Coherently Strained [110]-Oriented Ge-Si Core-Shell Nanowires
S Conesa-Boj1,2, A Li1,2, S Koelling2
1Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Germanium-Silicon core-shell nanowires show enhanced hole mobility due to controlled strain. This breakthrough advances potential applications in next-generation electronic and quantum transport devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Core-shell nanowires offer solutions to limitations in traditional heterostructures.
- Understanding strain relaxation is crucial for defect reduction and improved electronic properties.
Purpose of the Study:
- To investigate the mechanism of strain relaxation in [110]-oriented Germanium-Silicon (Ge-Si) core-shell nanowires.
- To enhance hole mobility by optimizing band offset and coherent strain.
Main Methods:
- Fabrication and characterization of individual Ge-Si core-shell nanowires.
- Electrical transport measurements to determine carrier mobility.
- Analysis of the correlation between mobility, crystal orientation, diameter, and strain.
Main Results:
- Achieved significantly enhanced hole mobility in [110]-oriented Ge-Si core-shell nanowires.
- Mobility values reached 4200 cm²/Vs at 4 K and 1600 cm²/Vs at room temperature.
- Demonstrated a direct correlation between mobility and factors like crystal direction, diameter, and coherent strain.
Conclusions:
- [110]-oriented Ge-Si core-shell nanowires exhibit substantial hole mobility enhancement.
- These nanowires are promising for advanced electronic and quantum transport devices.
- Controlling strain and band offset is key to unlocking their potential.
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