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Characterization of selective quantum well intermixing in 1.3um GaInNAs/GaAs structures

Sun, H.D. and Macaluso, R. and Dawson, M.D. and Robert, F. and Bryce, A.C. and Marsh, J.H. and Riechert, H. (2003) Characterization of selective quantum well intermixing in 1.3um GaInNAs/GaAs structures. Journal of Applied Physics, 94 (3). pp. 1550-1556. ISSN 0021-8979

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Abstract

Rapid thermal annealing combined with SiO2 caps deposited on the surface of samples by different techniques is used to selectively disorder 1.3 mum GaInNAs/GaAs multiquantum wells which have been preannealed in situ to the stage of blueshift saturation. After thermal annealing under specific conditions, a shift in band gap of over 170 meV has been obtained in sputtered SiO2-capped samples, while uncapped and plasma enhanced chemical vapor deposited SiO2-capped samples demonstrated a negligible shift. Quantum well intermixing in sputtered SiO2-capped samples originates from enhanced compositional interdiffusion due to the generation of point defects by ion bombardment during the sputtering process. Secondary ion mass spectrometry has confirmed that the enhanced blueshift was caused by the interdiffusion of group III atoms (In and Ga) between the quantum wells and barriers. Detailed photoluminescence and excitation spectroscopy were performed to study the optical properties of both intermixed and nonintermixed samples.

Item type: Article
ID code: 5243
Keywords: gallium compounds, indium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum wells, chemical interdiffusion, rapid thermal annealing, silicon compounds, spectral line shift, energy gap, plasma CVD coatings, point defects, secondary ion mass spectra, photoluminescence, sputtered coatings, Optics. Light, Physics and Astronomy(all)
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Institute of Photonics
Related URLs:
Depositing user: Strathprints Administrator
Date Deposited: 28 Jan 2008
Last modified: 04 Sep 2014 15:43
URI: http://strathprints.strath.ac.uk/id/eprint/5243

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