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Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Neumann, M. D. ; Cobet, C. ; Esser, N. ; Laumer, Bernhard ; Wassner, T. A. ; Eickhoff, Martin ; Feneberg, M. ; Goldhahn, R.

Originalveröffentlichung: (2011) Journal of Applied Physics, 2011, 110(1), Article 013520; doi:10.1063/1.3606414
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URN: urn:nbn:de:hebis:26-opus-86524

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Freie Schlagwörter (Englisch): excitonic absorption / emission , wurtzite Mg(x)Zn(1-x)O bandgap , exciton-phonen coupling (EPC) , delectric function (DF) , optical properties
Sammlung: Allianzlizenzen / Artikel
Universität Justus-Liebig-Universität Gießen
Institut: 1. Physikalisches Institut
Fachgebiet: Physik
DDC-Sachgruppe: Physik
Dokumentart: Aufsatz
Sprache: Englisch
Erstellungsjahr: 2011
Publikationsdatum: 05.03.2012
Kurzfassung auf Englisch: The characteristics of the excitonic absorption and emission around the fundamental bandgap of wurtzite Mg(x)Zn(1-x)O grown on c-plane sapphire substrates by plasma assisted molecular beam epitaxy with Mg contents between x = 0 and x = 0.23 are studied using spectroscopic ellipsometry and photoluminescence (PL) measurements. The ellipsometric data were analyzed using a multilayer model yielding the dielectric function (DF). The imaginary part of the DF for the alloys exhibits a pronounced feature which is attributed to exciton-phonon coupling (EPC) similar to the previously reported results for ZnO. Thus, in order to determine reliable transition energies, the spectral dependence is analyzed by a model which includes free excitonic lines, the exciton continuum, and the enhanced absorption due to EPC. A line shape analysis of the temperature-dependent PL spectra yielded in particular the emission-related free excitonic transition energies, which are compared to the results from the DF line-shape analysis. The PL linewidth is discussed within the framework of an alloy disorder model.
Lizenz: Allianzlizenz