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Phonon modes and raman scattering in SixGe1-x nanocrystals : microscopic modelling
Vasin, Alexander; Vikhrova, Olga; Vasilevskiy, MikhailSi1-xGex nanocrystals (NCs) of different composition and size were generated using the Molecular Dynamics (MD) method by minimizing NC’s total energy calculated using Tersoff’s empirical potential and applying rigid boundary conditions. The dynamical matrix of the relaxed NC was constructed and the NC phonon modes were calculated. The localisation of the principal (Si-Si, Si-Ge and Ge-Ge) modes is investigated ...
Impact of disorder on optical phonons confined in CdS nano-crystallites embedde...
Vasilevskiy, Mikhail; Rolo, Anabela G.; Gomes, M. J. M.; Vikhrova, Olga; Ricolleau, CristianNon-resonant Raman spectroscopy studies of a set of CdS films annealed at different temperatures were performed and showed a direct correlation between the width of the Raman peak produced by CdS-like optical phonons and the crystalline quality of the semiconductor phase probed by x-ray diffraction (XRD) and transmission electron microscopy (TEM). In order to decribe the Raman lineshape a model proposed by Tral...
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