Neumann, M. D.M. D.NeumannCobet, C.C.CobetEsser, N.N.EsserLaumer, BernhardBernhardLaumerWassner, T. A.T. A.WassnerEickhoff, MartinMartinEickhoffFeneberg, M.M.FenebergGoldhahn, R.R.Goldhahn2023-06-022012-03-052023-06-022011http://nbn-resolving.de/urn:nbn:de:hebis:26-opus-86524https://jlupub.ub.uni-giessen.de/handle/jlupub/16385http://dx.doi.org/10.22029/jlupub-15765The 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.enIn Copyrightexcitonic absorption / emissionwurtzite Mg(x)Zn(1-x)O bandgapexciton-phonen coupling (EPC)delectric function (DF)optical propertiesddc:530