Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 27: Nitrides: Preparation and characterization II

HL 27.10: Vortrag

Mittwoch, 14. März 2018, 12:00–12:15, EW 203

Parametric model for the anisotropic dielectric function of m-plane AlGaN up to 20eV — •Michael Winkler1, Martin Feneberg1, Shigefusa F. Chichibu2, Ramón Collazo3, Zlatko Sitar3, Maciej D. Neumann4, Norbert Esser4, and Rüdiger Goldhahn11Institut für Experimentelle Physik, Otto-von-Guericke-Universität Magdeburg, Germany — 2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan — 3Department of Materials Science and Engineering, North Carolina State University, USA — 4Leibniz-Institut für Analytische Wissenschaften - ISAS, Berlin, Germany

The linear optical response of nonpolar (1010) (m-plane) AlxGa1−xN epitaxial films was analyzed quantitatively for the full composition range. The samples were grown by metal-organic vapor phase epitaxy and molecular beam epitaxy on m-plane freestanding GaN and AlN substrates. Spectroscopic ellipsometry up to 20eV was measured at the synchrotron Metrology Light Source (MLS) of the PTB in Berlin for each sample. Using a point-by-point fit the ordinary and the extraordinary dielectric functions were obtained.

These data were used to fit the parameters for an ordinary and extraordinary model DF ε⊥,∥(x,ω) in the spectral range from 0.7eV to 20eV, where the AlN-concentration x can be chosen arbitrarily. The model DF compares well with previous results for the ordinary DF and with the position of the high energy interband transitions.

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