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Gallardo, E, Lazic, S, Calleja, JM, Miguel-Sanchez, J, Montes, M, Hierro, A, Gargallo-Caballero, R, Guzman, A, Munoz, E, Teweldeberhan, AM, Fahy, S;
Physica E-Low-Dimensional Systems & Nanostructures
Resonant Raman Study of Local Vibration Modes In Algaasn Layers
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We report on resonant inelastic light scattering in dilute AlGaAsN films. Intense narrow peaks associated to N-related local vibration modes (LVM) have been observed around 325, 385, 400, 450, 500 and 540 cm(-1). Their frequencies are compared to density functional theory supercell calculations of AlnGa4-nN complexes (n = 1-4). We find clear indications of the formation of Al4N complexes. The values of the extended phonon frequencies reveal changes in the N distribution depending on the growth conditions. The LVM spectra are resonant in the energy range from 1.75 to 1.79 eV, which corresponds to an N-related electronic transition. Our results confirm the preferential bonding of N to Al in AlGaAsN. (C) 2007 Elsevier B.V. All rights reserved..
DOI 10.1016/j.physe.2007.09.117
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