Electrical and Computer Engineering Publications
Analytical model for the optical functions of indium gallium nitride with application to thin film solar photovoltaic cells
Document Type
Article
Publication Date
2-15-2012
Volume
177
Issue
2
Journal
Materials Science and Engineering B: Solid-State Materials for Advanced Technology
First Page
239
URL with Digital Object Identifier
10.1016/j.mseb.2011.12.008
Last Page
244
Abstract
This paper presents the preliminary results of optical characterization using spectroscopic ellipsometry of wurtzite indium gallium nitride (In xGa 1-xN) thin films with medium indium content (0.38 < x < 0.68) that were deposited on silicon dioxide using plasma-enhanced evaporation. A Kramers-Kronig consistent parametric analytical model using Gaussian oscillators to describe the absorption spectra has been developed to extract the real and imaginary components of the dielectric function (ε 1, ε 2) of In xGa 1-xN films. Scanning electron microscope (SEM) images are presented to examine film microstructure and verify film thicknesses determined from ellipsometry modeling. This fitting procedure, model, and parameters can be employed in the future to extract physical parameters from ellipsometric data from other In xGa 1-xN films. © 2011 Elsevier B.V. All rights reserved.