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DPG

Hamburg 2001 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 24: Poster II

HL 24.31: Poster

Donnerstag, 29. März 2001, 10:30–19:00, Rang S\ 3

Optical investigation of AlxGa1−xN alloys grown on AlN epitaxial films — •N. Teofilov1, K. Thonke1, L. Kirste2, D. Ebling2, R. Sauer1, and K. Benz21Abteilung Halbleiterphysik Universität Ulm, 89069 Ulm — 2Freiburger Materialforschungszentrum, Universität Freiburg, 79104 Freiburg

AlxGa1−xN/AlN heterostructures were grown on c-plane sapphire by RF-plasma enchanced molecular beam epitaxy. The Al mole fraction was varied over the whole composition range (0<x<1). Low temperature reflection and cathodoluminescence measurements have been carried out in the energy range from 3.0 eV to 6.2 eV at liquid helium temperatures in order to study the dependence of the optical band-gap energy on the alloys composition. We find a bowing parameter of (2.3 ± 0.4) eV at 10 K. The energy dispersion of the refractive index and the thicknesses of both, the AlGaN active layer and AlN buffer layer, have been obtained from numerical simulations of the reflectivity spectra, using a two-layer (substrat/interlayer/active layer) model.

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