Growth model investigation for AlN/Al(Ga)InN interface growth by plasma-assisted molecular beam epitaxy for high electron mobility transistor applications
| Autor: | Ruediger Quay, Birte-Julia Godejohann, Lutz Kirste, Oliver Ambacher, Rolf Aidam, Elke Diwo |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Electron mobility
Materials science business.industry Crystal growth Heterojunction Surfaces and Interfaces High-electron-mobility transistor Condensed Matter Physics Epitaxy Surfaces Coatings and Films Electronic Optical and Magnetic Materials Materials Chemistry Optoelectronics Wafer Field-effect transistor Electrical and Electronic Engineering business Molecular beam epitaxy |
| Zdroj: | physica status solidi (a). 211:2854-2860 |
| ISSN: | 1862-6300 |
| Popis: | Heterostructures with lattice matched Al(Ga)InN barriers have been widely investigated as alternative to standard AlGaN/GaN based high electron mobility transistor structures for high power applications. Mostly these heterostructures comprise a thin AlN based spacer between GaN channel and lattice matched barrier. One key issue for high quality plasma-assisted molecular beam epitaxy (PA-MBE) of these structures is the control of the AlN–Al(Ga)InN interface since optimal growth conditions for high quality AlN differ significantly from those for growth of indium containing material. In this paper, a detailed analysis and a deduced model of the interface growth is presented. The Al/N ratio during AlN spacer growth is likely to influence the subsequent growth of quaternary Al(Ga)InN. Ideal Al/N ratio leads to high performance heterostructures, while slightly Al-rich conditions lead to the formation of Al residues on the substrate surface, which hinder subsequent epitaxial growth. Al/N ratios below unity lead to the deposition of ternary AlGaN instead of binary AlN spacers and to increased alloy scattering. An insertion of a thin GaN layer between spacer and barrier can hinder the formation of Al residues and leads to improved wafer homogeneity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text