Influence of steering effects on strain detection in AlGaInN/GaN heterostructures by ion channellin

Redondo-Cubero, Andrés and Lorenz, K. and Franco, N. and Fernández-Garrido, Sergio and Gago, R. and Smulders, P.J.M. and Muñoz Merino, Elias and Calleja Pardo, Enrique and Alves, E. (2010). Influence of steering effects on strain detection in AlGaInN/GaN heterostructures by ion channellin. In: "51st Workshop of the INFN Eloisatron Project", 25/10/2008-01/11/2008, Erice, Italia. ISBN 978-981-4307-00-0.

Description

Title: Influence of steering effects on strain detection in AlGaInN/GaN heterostructures by ion channellin
Author/s:
  • Redondo-Cubero, Andrés
  • Lorenz, K.
  • Franco, N.
  • Fernández-Garrido, Sergio
  • Gago, R.
  • Smulders, P.J.M.
  • Muñoz Merino, Elias
  • Calleja Pardo, Enrique
  • Alves, E.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 51st Workshop of the INFN Eloisatron Project
Event Dates: 25/10/2008-01/11/2008
Event Location: Erice, Italia
Title of Book: Charged and Neutral Particles Channeling Phenomena: Selected Papers from the Proceedings of the 51st Workshop of the INFN Eloisatron Project
Date: March 2010
ISBN: 978-981-4307-00-0
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Ion steering effects in the interface of heterostructures can strongly influence the shape and position of angular channelling scans leading to considerable error in the determination of strain by ion channelling. As an example, this paper presents channelling measurements on a near-lattice-matched AlGaInN/GaN heterostructure which show no shift between the angular scans from the quaternary layer and the underlying GaN substrate although high resolution x-ray diffraction data confirm the presence of strain in the layer. Such ‘anomalous’ behaviour was studied by means of Monte Carlo simulations for nitride ternary and quaternary films in the whole composition range. The simulations show that the thickness, magnitude of the distortion of the strained lattice and energy of the probing beam are critical parameters controlling the impact of steering. Three composition/strain regions were established for a typical beam of 2MeV alpha particles corresponding to different intensities of the steering potential and in which strain measurements by ion channelling are (a) correct, (b) possible but require corrections and (c) not possible due to steering effects.

More information

Item ID: 3911
DC Identifier: http://oa.upm.es/3911/
OAI Identifier: oai:oa.upm.es:3911
Official URL: http://www.worldscibooks.com/physics/7743.html
Deposited by: Memoria Investigacion
Deposited on: 28 Mar 2011 10:53
Last Modified: 20 Apr 2016 13:20
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