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Proceedings Paper

Shaping of the band gap in AlInGaN alloys
Author(s): Gintautas Tamulaitis; Saulius Jursenas; K. Kazlauskas; Arturas Zukauskas; Mohamed Asif Khan; Jinwei Yang; Grigory S. Simin; Remis Gaska; Michael S. Shur
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Paper Abstract

Strain Energy Band Engineering of Group III-N heterostructures should allow us to prevent defect formation at the heterointerfaces ad to reduce the built-in electric field in the quantum wells. The strain, caused by lattice mismatch, may be decreased by incorporation of In into AlGaN. To monitor structural perfection of the quaternary compound AlInGaN and to evaluate electronic potential profile, we employed optical methods: reflectivity, site- selectively excited photoluminescence, photoluminescence excitation and time-resolved luminescence. AlGaN with the molar fraction of Al of 9% and two samples with the lattice mismatch reduced by partial substitution of Al by 1% and 2% of In were investigated. In AlGaN, the luminescence excited resonantly with the exciton position is red shifted. The photoluminescence excitation spectra indicate that the mobility edge is above the optical band gap, and the localization vanishes. These results show that the incorporation of approximately equals 2% indium into AlGaN leads to the disappearance of the band tail states and smoothing of the potential profile.

Paper Details

Date Published: 8 March 2001
PDF: 6 pages
Proc. SPIE 4318, Smart Optical Inorganic Structures and Devices, (8 March 2001); doi: 10.1117/12.417586
Show Author Affiliations
Gintautas Tamulaitis, Vilnius Univ. (Lithuania)
Saulius Jursenas, Vilnius Univ. (Lithuania)
K. Kazlauskas, Vilnius Univ. (Lithuania)
Arturas Zukauskas, Vilnius Univ. (United States)
Mohamed Asif Khan, Univ. of South Carolina (United States)
Jinwei Yang, Univ. of South Carolina (United States)
Grigory S. Simin, Univ. of South Carolina (United States)
Remis Gaska, Sensor Electronic Technology, Inc. (United States)
Michael S. Shur, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 4318:
Smart Optical Inorganic Structures and Devices
Steponas P. Asmontas; Jonas Gradauskas, Editor(s)

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