Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Optical properties

HL 53.9: Vortrag

Freitag, 29. Februar 2008, 12:45–13:00, EW 201

Ab-initio Calculations of Raman scattering in SnO_x — •Ralf Meyer — Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany

Oxidic semiconductors like ZnO_x and SnO_x have recently attracted a lot of attraction as possible optical materials for novel technological applications. Experimental studies of SnO_1.5 nanoparticles have shown strong differences between the Raman spectra of this material compared to the Raman spectra of bulk SnO₂ [1]. In order to understand these differences, ab-initio calculations of the Raman scattering properties of bulk SnO₂ and SnO_1.5 have been performed. It is shown that the spectra obtained from these calculations compare qualitatively well with the experimental findings. From this, it is concluded that the differences in the experiments are an effect of the bulk materials. An analysis of the nature of the calculated Raman active vibrational modes makes it possible to draw further conclusions on the reasons behind the differences between both types of materials.

[1] C. Meier et al., J. Appl. Phys. 99, 113108 (2006).