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Self-Catalyzed InSb/InAs Quantum Dot Nanowires.
Omer Arif1, Valentina Zannier1, Francesca Rossi2
1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy.
Nanomaterials (Basel, Switzerland)
|January 16, 2021
Summary
Researchers developed self-catalyzed InAs/InSb/InAs nanowires with InSb quantum dots on silicon. Growth temperature and arsenic pressure control nanowire morphology, crucial for quantum structure development.
Area of Science:
- Materials Science
- Nanotechnology
- Semiconductor Physics
Background:
- Nanowire platforms enhance semiconductor quantum wells and dots.
- Self-catalyzed growth is key for complex heterostructures.
Purpose of the Study:
- To present the self-catalyzed growth of InAs/InSb/InAs heterostructured nanowires with a single InSb quantum dot on Si substrates.
- To investigate the influence of growth parameters on nanowire morphology and understand growth mechanisms.
Main Methods:
- Chemical beam epitaxy (CBE) for self-catalyzed growth.
- Systematic variation of growth parameters (temperature, As pressure) for the InAs top segment.
- Analysis of nanowire morphology and diameter evolution.
Main Results:
- Growth temperature significantly affects axial and radial growth rates, allowing control over InAs shell thickness.
- As line pressure enhances growth rates while preserving the In droplet.
- Two In diffusion paths contribute to radial InAs growth, influencing final nanowire shape.
Conclusions:
- The study provides insights into the growth mechanisms of self-catalyzed InSb/InAs quantum dot nanowires.
- Results offer guidelines for fabricating quantum structures with controlled morphology and properties.
- Findings are applicable to other self-catalyzed heterostructured nanowires.
