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Far-infrared transmission in GaN,AlN and AlGaN thin films grown by molecular beam epitaxy
Citation
Ibáñez Insa, Jordi, Domènech Hernández, Sònia, Alarcón-Lladó, Esther, Cuscó Cornet, Ramón, Artús Surroca, Lluis, Novikov, S.V., Foxon, C.T. and Calleja Pardo, Enrique 
ORCID: https://orcid.org/0000-0002-3686-8982
(2008).
Far-infrared transmission in GaN,AlN and AlGaN thin films grown by molecular beam epitaxy.
"Journal of Applied Physics", v. 104
(n. 3);
pp..
ISSN 0021-8979.
https://doi.org/10.1063/1.2968242.
Description
| Title: | Far-infrared transmission in GaN,AlN and AlGaN thin films grown by molecular beam epitaxy |
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| Author/s: |
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| Item Type: | Article |
| Título de Revista/Publicación: | Journal of Applied Physics |
| Date: | August 2008 |
| ISSN: | 0021-8979 |
| Volume: | 104 |
| Subjects: | |
| Freetext Keywords: | GaN; AlN; AlGaN; molecular beam epitaxy |
| Faculty: | E.T.S.I. Telecomunicación (UPM) |
| Department: | Ingeniería Electrónica |
| Creative Commons Licenses: | Recognition - No derivative works - Non commercial |
Abstract
We present a far-infrared transmission study on group-III nitride thin films. Cubic GaN and AlN layers and c-oriented wurtzite GaN, AlN, and AlxGa1−xN (x<0.3) layers were grown by molecular beam epitaxy on GaAs and Si(111) substrates, respectively. The Berreman effect allows us to observe simultaneously the transverse optic and the longitudinal optic phonons of both the cubic and the hexagonal films as transmission minima in the infrared spectra acquired with obliquely incident radiation. We discuss our results in terms of the relevant electromagnetic theory of infrared transmission in cubic and wurtzite thin films. We compare the infrared results with visible Raman-scattering measurements. In the case of films with low scattering volumes and/or low Raman efficiencies and also when the Raman signal of the substrate material obscures the weaker peaks from the nitride films, we find that the Berreman technique is particularly useful to complement Raman spectroscopy
More information
| Item ID: | 2747 |
|---|---|
| DC Identifier: | https://oa.upm.es/2747/ |
| OAI Identifier: | oai:oa.upm.es:2747 |
| DOI: | 10.1063/1.2968242 |
| Official URL: | http://jap.aip.org/japiau/v104/i3 |
| Deposited by: | Memoria Investigacion |
| Deposited on: | 26 Mar 2010 09:22 |
| Last Modified: | 20 Apr 2016 12:25 |
