Cathodoluminescence studies of growth and process-induced defects in bulk gallium antimonide



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Méndez Martín, Bianchi and Dutta, P. S. and Piqueras de Noriega, Javier and Dieguez, E. (1995) Cathodoluminescence studies of growth and process-induced defects in bulk gallium antimonide. Applied Physics letter, 67 (18). pp. 2648-2650. ISSN 0003-6951

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The homogeneity and luminescence properties of undoped bulk GaSb have been studied by the cathodoluminescence (CL) technique in the scanning electron microscope. CL images have revealed a nonuniform distribution of native defects in GaSb wafers prepared from as-grown single crystals. Postgrowth annealing in vacuum, gallium, and antimony atmospheres has been performed to obtain more accurate information about the defect structure in this material. In general, on annealing, homogeneous distribution of impurities is observed throughout the wafers. CL spectra show that a luminescence band (centered at 756 meV) is enhanced by annealing in a gallium atmosphere, suggesting that Ga atoms play an important role in the formation of this acceptor center. The 756 meV peak has been attributed to a transition from conduction band to an acceptor center comprised of Ga-Sb or a related complex. Interestingly, localized crystallization at the subgrain boundaries seems to occur by annealing in Ga atmosphere.

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© 1991 All Rights Reserved.
This work has been supported by the DGICYT (Project No. PB93-1256) and ESP95-0148. One of the authors (P.S.D.) gratefully thanks CSIR (India) for the award of the Senior Research Fellowship and UAM, Madrid, Spain, for the visiting scientist fellowship.

Uncontrolled Keywords:Molecular-Beam Epitaxy, Liquid-Phase Epitaxy, Sb-Rich Solutions, Gasb, Photoluminescence, Gaas
Subjects:Sciences > Physics > Materials
ID Code:24845
Deposited On:02 Apr 2014 14:43
Last Modified:29 Apr 2014 12:08

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