Fabrication, optical characterization and modeling of strained core-shell nanowires

TL;DR

This study investigates strained InAs/InP core-shell nanowires grown by Chemical Beam Epitaxy, analyzing their optical properties and modeling emission energies to enable tunable infrared emission based on structural parameters.

Contribution

It provides a detailed experimental and theoretical analysis of how shell thickness and core diameter influence emission energy in strained nanowires, demonstrating tunability.

Findings

Emission energy can be tuned to 0.8 eV by adjusting shell thickness and core diameter.

Measured energies align with calculations assuming hexagonal crystal structure.

Optical properties depend on strain and structural parameters.

Abstract

Strained nanowires with varying InAs/InP core-shell thicknesses were grown using Chemical Beam Epitaxy. Microphotoluminescence spectroscopy, performed at low temperature, was then used to study the optical properties of single wires. Emission from the InAs core was observed and its dependence on the shell thickness/core diameter ratio was investigated. We found that it is possible to tune the emission energy towards 0.8 eV by controlling this ratio. We have compared the measured energies with calculated energies. Our findings are consistent with the wires having a hexagonal crystal structure.