Gallardo, E, Lazic, S, Calleja, JM, Miguel-Sanchez, J, Montes, M, Hierro, A, Gargallo-Caballero, R, Guzman, A, Munoz, E, Teweldeberhan, AM, Fahy, S;

2008

April

Physica E-Low-Dimensional Systems & Nanostructures

Resonant Raman Study of Local Vibration Modes In Algaasn Layers

Validated

()

40

6

2084

2086

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