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Updated: Apr 6, 2026

Fabricating Nanogaps by Nanoskiving

Fabricating Nanogaps by Nanoskiving

Published on: May 13, 2013

Abrupt GaP/GaAs Interfaces in Self-Catalyzed Nanowires.

Giacomo Priante¹, Gilles Patriarche¹, Fabrice Oehler¹

¹CNRS-Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.

|July 29, 2015

Summary

Researchers developed a new method for growing high-quality gallium phosphide (GaP) and gallium arsenide (GaAs) nanowire heterostructures. This technique improves interface abruptness for advanced electronic and photonic applications.

Keywords:

III−V semiconductors Nanowires heterostructure interfaces molecular beam epitaxy self-catalyzed

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Area of Science:

Materials Science
Nanotechnology
Semiconductor Physics

Background:

Gallium phosphide (GaP) and gallium arsenide (GaAs) are crucial III-V semiconductor materials.
Fabricating axial heterostructures of GaP/GaAs with sharp interfaces is challenging.
Self-catalyzed nanowire growth offers a pathway for complex material structures.

Purpose of the Study:

To develop a self-catalyzed growth method for pure GaP and GaAs1-xPx/GaAs1-yPy nanowire heterostructures.
To optimize flux switching procedures for abrupt interfaces.
To demonstrate facile synthesis of GaP/GaAs heterostructures on silicon.

Main Methods:

Solid-source molecular beam epitaxy (MBE) was employed for nanowire growth.
Group V flux switching was used to create consecutive GaAs and GaP segments.
High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) was used for atomic-resolution compositional analysis.
Various flux switching procedures were tested to determine optimal interface abruptness.

Main Results:

Pure GaP nanowires and GaAs1-xPx/GaAs1-yPy nanowire heterostructures were successfully grown.
Switching off all molecular beam fluxes during group V commutation drastically improved interface abruptness.
The morphology of the growth front (flat or truncated) was controllable by adjusting growth conditions.
High-quality GaP/GaAs axial heterostructures were synthesized directly on Si (111) wafers.

Conclusions:

A facile and effective method for self-catalyzed growth of GaP/GaAs axial heterostructures was established.
The optimized MBE process yields abrupt interfaces crucial for device performance.
This technique enables the direct integration of high-quality III-V nanowire heterostructures onto silicon substrates.