Photoluminescence characterization of AlGaN-GaN pseudomorphic quantum wells and calculation of strain induced bandgap shifts |
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| Authors: | S Krishnankutty R M Kolbas M A Khan J N Kuznia J M Van Hove D T Olson |
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| Affiliation: | (1) Department of Electrical & Computer Engineering, North Carolina State University, 27695 Raleigh, North Carolina;(2) APA Optics Inc., 2950 NE 84th Lane, 55434 Blaine, Minnesota |
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| Abstract: | The low temperature (77 K) photoluminescence characteristics of Al
x
Ga1-x
N-GaN strained layer quantum wells with differentx values grown by metalorganic chemical vapor deposition (MOCVD) were investigated. The photoluminescence spectra were useful
in analyzing both quantum confinement effects and strain induced energy shifts. The strain induced shifts were found to be
a strong function of aluminum compositionx. A model was developed to calculate the strain induced bandgap shifts atk = 0. The values predicted by this model which took into account the wurtzite crystal structure of the material system, were
in good agreement with (i.e. within 2 meV of) the experimentally measured shifts. |
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| Keywords: | Photoluminescence pseudomorphic strain quantum confinement wurtzite crystal |
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