Advances in the theory of III-V Nanowire Growth Dynamics

TL;DR

This paper introduces a comprehensive continuum formalism for modeling the growth dynamics of III-V nanowires, integrating thermodynamic and kinetic factors to better understand and predict their complex vapor-liquid-solid growth processes.

Contribution

It presents a novel theoretical framework for nanowire growth kinetics based on thermodynamics and transition state theory, applicable to various experimental conditions.

Findings

Unified model for NW growth dynamics

Application to GaAs NWs on Si substrates

Insights into temperature and flux control parameters

Abstract

Nanowire (NW) crystal growth via the vapour_liquid_solid mechanism is a complex dynamic process involving interactions between many atoms of various thermodynamic states. With increasing speed over the last few decades many works have reported on various aspects of the growth mechanisms, both experimentally and theoretically. We will here propose a general continuum formalism for growth kinetics based on thermodynamic parameters and transition state kinetics. We use the formalism together with key elements of recent research to present a more overall treatment of III_V NW growth, which can serve as a basis to model and understand the dynamical mechanisms in terms of the basic control parameters, temperature and pressures/beam fluxes. Self-catalysed GaAs NW growth on Si substrates by molecular beam epitaxy is used as a model system.