Identification of main contributions to conductivity of epitaxial InN

TL;DR

This study investigates the various contributions affecting the electrical conductivity of epitaxial InN films, identifying the dominant roles of nanoparticles, near-interface, and bulk layers through high-field transport measurements.

Contribution

It provides a detailed analysis of the main factors influencing InN conductivity, highlighting the dominant contributions of nanoparticles, near-interface, and bulk layers, with surface effects being significant only in specific conditions.

Findings

In nanoparticles, near-interface, and bulk layers dominate conductivity

Surface layer influence is significant only in low-mobility Mg-doped InN

Transport parameters were determined using high-field Shubnikov-de Haas oscillations

Abstract

Complex effect of different contributions (spontaneously formed In nanoparticles, near-interface, surface and bulk layers) on electrophysical properties of InN epitaxial films is studied. Transport parameters of the surface layer are determined from the Shubnikov-de Haas oscillations measured in undoped and Mg-doped InN films at magnetic fields up to 63 T. It is shown that the In nanoparticles, near-interface and bulk layers play the dominant role in the electrical conductivity of InN, while influence of the surface layer is pronounced only in the compensated low-mobility InN:Mg films.