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Anisotropic-Strain-Induced Band Gap Engineering in Nanowire-Based Quantum Dots
Luca Francaviglia1, Andrea Giunto1, Wonjong Kim1
1Laboratoire des Matériaux Semiconducteurs, Institut des Matériaux , Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne , Switzerland.
Nano Letters
|March 27, 2018
Summary
Applying strain via an oxide envelope tunes light emission in gallium arsenide (GaAs) nanowires and quantum dots. This method offers precise control over semiconductor properties for advanced applications.
Area of Science:
- Semiconductor physics
- Materials science
- Nanotechnology
Background:
- Strain engineering is a key method for tuning semiconductor properties.
- Gallium arsenide (GaAs) nanowires (NWs) and quantum dots are crucial for optoelectronic devices.
Purpose of the Study:
- To demonstrate strain-induced tuning of light emission in GaAs NWs and quantum dots.
- To investigate the anisotropic nature of strain and its dependence on oxide properties.
Main Methods:
- Applying strain using a precisely controlled oxide envelope around GaAs NWs.
- Characterizing strain distribution and its effect on light emission using ensemble and single-NW measurements.
- Comparing experimental results with uniaxial stress equations.
Main Results:
- Achieved tuning of light emission up to 115 meV.
- Demonstrated highly anisotropic strain with a significant longitudinal component.
- Established a strong correlation between strain, oxide thickness, intrinsic strain, and microstructure.
Conclusions:
- Strain engineering via oxide envelopes effectively tunes GaAs optoelectronic properties.
- Findings are consistent across single-NW and ensemble measurements, highlighting general applicability.
- This work provides a foundation for strain-induced band gap engineering in semiconductors.
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