Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 51: Poster IV
HL 51.3: Poster
Donnerstag, 28. Februar 2008, 16:30–19:00, Poster D
Optical investigations of hexagonal MgxZn1−xO thin layers in UV spectral range — •Alexander Müller, Gabriele Benndorf, Susanne Heitsch, Holger Hochmuth, Christoph Meinecke, and Marius Grundmann — Universität Leipzig, Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Linnéstr. 5, D-04103 Leipzig, Germany
Ternary alloys of MgxZn1−xO have been grown by pulsed laser deposition on a-plane sapphire substrates at different oxygen partial pressures between 1.6× 10−2 and 5× 10−5 mbar, using targets with MgO concentrations from 0 to 10 wt-%. The Mg content of the thin films varies between 0 % and 34 %.
The optical properties of the samples were investigated using photoluminescence (PL) measurements and transmission measurements. On selected samples, temperature dependent PL and transmission mesurements were performed.
The refraction index of MgxZn1−xO thin films in dependence on the wavelength of the transmitted light is not well known. Therefore, the transmission spectra were modeled using Model Dielectric Functions to obtain information about exciton energies and broadening parameters. Exciton-phonon-complexes are taken into account to describe the equally spaced dips which were found in some transmission spectra.
To support the results of the static measurements, time resolved PL measurements were performed.