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Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 4: New materials

HL 4.7: Vortrag

Montag, 27. März 2006, 11:45–12:00, BEY 154

Ellipsometry and Microreflection on Cylindrite — •Chris Sturm1, Rüdiger Schmidt-Grund1, Ronny Kaden2, Bernd Rheinländer1, Klaus Bente2, and Marius Grundmann11Universität Leipzig, Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig — 2Universität Leipzig, Fakultät für Chemie und Mineralogie, Institut für Mineralogie, Kristallographie und Materialwissenschaft, Scharnhorststraße 20, 04275 Leipzig

Cylindrite, FeSn4Pb3Sn2S14, is a sulfosalt mineral which naturally occurs as lamellae and cylinders. Thus, it is a promising material for micro- and nanostructures. Up to now the optical dielectric function is not known.
By CVT (chemical vapour transport) with iodine as transport agent the cylindrite crystals where synthesized as platelets as well as cylinders.
The samples were studied by ellipsometry in the spectral range from 0.75 eV to 3.5 eV and by microreflection technique in the spectral range from 1.8 eV to 3.2 eV. Using a layer structure model the dielectric function of Cylindrite was obtained. This dielectric function was found to be similar to those of a semiconductor. From the reflectivity spectra in the absorption range it can be concluded that the chemical composition of the cylindric and lamellar samples is different.

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