Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.19: Poster

Wednesday, March 24, 2010, 15:00–17:30, Poster A

Optical properties of single crystalline silicon nanowires — •Gerald Brönstrup and Silke Christiansen — Institut für Photonische Technologien e.V., Abt. Halbleiter-Nanostrukturen, 07745 Jena

Silicon Nanowires [SiNWs] have attracted much attention in the recent years as possible future building blocks for field effect transistors, sensors, solar cells and photo detectors. However an analysis of the optical properties of single SiNWs has not been published to the best of our knowledge. Here we present a theoretical analysis using the well known Mie-theory. We calculated the absorption and scattering cross sections with respect to the radius of the SiNWs the angle of incident of the illuminating light, its polarization and wavelength. In the limit of ray optics the cross sections are limited to the geometrical area of the illuminated objects. Since the dimensions of SiNWs can be much smaller than the wavelength of the visible light, ray optics cannot be used. Because of that and the wave nature of light the cross sections could be larger than the geometrical area of the SiNWs. Indeed we found that both scattering and absorption cross sections are much larger than the geometrical area of the SiNW for certain wavelengths and radii. Additionally a strong dependence on both the radii of the SiNWs and the wavelength of the illuminating light was found. This makes it possible to tune future devices to certain wavelengths by synthesizing SiNWs with the appropriate radius.