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Scattering analysis of two-dimensional electrons in AlGaN/GaN with bulk related parameters extracted by simple parallel conduction extraction method

Lisesivdin, S B and Yildiz, A and Balkan, Naci and Kasap, M and Ozcelik, S and Ozbay, E (2010) 'Scattering analysis of two-dimensional electrons in AlGaN/GaN with bulk related parameters extracted by simple parallel conduction extraction method.' Journal of Applied Physics, 108 (1). 013712. ISSN 0021-8979

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Abstract

We carried out the temperature (22–350 K) and magnetic field (0.05 and 1.4 T) dependent Hall mobility and carrier density measurements on Al0.22Ga0.78N/GaN heterostructures with AlN interlayer grown by metal-organic chemical-vapor deposition. Hall data is analyzed with a simple parallel conduction extraction method and temperature dependent mobility and carrier densities of the bulk and two-dimensional (2D) electrons are extracted successfully. The results for the bulk carriers are discussed using a theoretical model that includes the most important scattering mechanisms that contribute to the mobility. In order to investigate the mobility of two-dimensional electron gas, we used a theoretical model that takes into account the polar optical phonon scattering, acoustic phonon scattering, background impurity scattering, and interface roughness scattering in 2D. In these calculations, the values are used for the deformation potential and ionized impurity density values were obtained from the bulk scattering analysis. Therefore, the number of fitting parameters was reduced from four to two.

Item Type: Article
Uncontrolled Keywords: aluminium compounds; carrier density; gallium compounds; Hall mobility; III-V semiconductors; impurity scattering; interface roughness; MOCVD; two-dimensional electron gas; wide band gap semiconductors
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Jim Jamieson
Date Deposited: 06 Mar 2012 11:34
Last Modified: 06 Mar 2012 11:34
URI: http://repository.essex.ac.uk/id/eprint/2245

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