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Cathodoluminescence of Ga_(1-x)In_xAs_ySb_(1-y) epitaxial layers

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Cheze, C. and Méndez Martín, Bianchi and Piqueras de Noriega, Javier and Corregidor, V. (2006) Cathodoluminescence of Ga_(1-x)In_xAs_ySb_(1-y) epitaxial layers. Journal of Optoelectronics and advanced materials, 8 (1). pp. 304-307. ISSN 1454-4164

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Abstract

Quaternary Ga_(1-x)In_xAs_ySb_(1-y) layers lattice matched to a GaSb substrate are of interest for applications in the infrared range. In this work, the luminescence of Ga_(1-x)In_xAs_ySb_(1-y) layers grown on GaSb by metal organic vapor phase epitaxy (MOVPE) with different In and As contents, has been studied by cathodoluminescence (CL) in a scanning electron microscope (SEM). CL images show a cellular structure which indicates the presence of dislocations decorated by recombination centers. Band gap values of 0.735 eV and 0.717 eV were measured from the CL spectra of two samples with diferent In content. This result is analyzed in the frame of existing theoretical models relating band gap with In and As content, in quaternary lattice matched layers. The band gap values are in good agreement with results of atomistic pseudopotential calculations.


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Corresponding author: piqueras@fis.ucm.es.
This work was carried out in the frame of the European network HPRN-CT-2001-00199. Partial support of MEC (MAT2003-00455) is acknowledged. The samples were grown in the Fraunhofer Institute ISE in Freiburg. The collaboration of N. P. Barradas and M. Reis

Uncontrolled Keywords:Gasb, Growth, Gainassb/Gasb, Alloys
Subjects:Sciences > Physics > Materials
ID Code:24348
Deposited On:29 Jan 2014 15:32
Last Modified:20 May 2014 08:32

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