Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3610469
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- synchrotron radiation source BESSY II of the Helmholtz-Zentrum Berlin (HZB)
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We demonstrate that synchrotron-based photoluminescence excitation (PLE) spectroscopy is a versatile tool for determining valence band splittings of AlN and high aluminum content AlGaN. PLE results are independently confirmed by synchrotron-based spectroscopic ellipsometry. The splittings between the ordinary and the extraordinary absorption edges are found to be -240 meV and -170 meV for AlN and Al0.94Ga0.06N, respectively. These values differ from the crystal field energy due to residual strain. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3610469]
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