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Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 45: Group-III-Nitrides: Optical Properties II

HL 45.10: Talk

Wednesday, March 24, 2010, 17:00–17:15, H15

Optical properties of homoepitaxial AlN — •Martin Feneberg1, Benjamin Neuschl1, Ramon Collazo2, Anthony Rice2, Zlatko Sitar2, Jinqiao Xie3, Seiji Mita3, Georg Rossbach4, Rüdiger Goldhahn4, Marcus Roeppischer5, Christoph Cobet5, Norbert Esser5, and Klaus Thonke11Institut für Halbleiterphysik, Universität Ulm — 2Dept. of Mat. Sci. Engr., North Carolina State University, USA — 3HexaTech, Inc., Morrisville, NC, USA — 4Institut für Physik, TU Ilmenau — 5ISAS, Berlin

Homoepitaxial c- and m-plane AlN layers, deposited by MOCVD on bulk PVT AlN are investigated by means of high resolution photoluminescence and spetroscopic ellipsometry. We find donor bound exciton lines with a full width at half maximum below 500 µeV at T = 10 K. The exciton binding energy amounts to 52 meV in the c-plane sample leading to a bandgap energy of 6.092 eV (at 10 K). By spectroscopic ellipsometry we access both the ordinary and the extraordinary dielectric functions. The analysis of the sharp free exciton resonance found in the extraordinary tensor components yields a transition energy being in excellent agreement with the emission studies. The ordinary component exhibits a feature which indicates a strong contribution of exciton-phonon interaction to the absorption process.

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