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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Photoluminescence and phonon satellites of single InGaN/GaN quantum wells with varying GaN cap thickness

Tan, L.T. and Martin, R.W. and O'Donnell, K.P. and Watson, I.M. (2006) Photoluminescence and phonon satellites of single InGaN/GaN quantum wells with varying GaN cap thickness. Applied Physics Letters, 89 (10). ISSN 0003-6951

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Abstract

Variations in thickness of the GaN caps above single InGaN quantum wells have been studied using photoluminescence spectroscopy. Data are presented from two series of samples designed to promote energy transfer to luminescent species on the surface. Improvements in the optical properties as the GaN cap thickness increases from 2.5 to 15 nm are accompanied by clear changes in the intensity of the LO-phonon satellites. Analysis of the strength of successive phonon satellites and the associated Huang-Rhys factors indicates that the amount of localization of the excitons is increased for the thinner cap samples. Surface depletion fields are also considered.