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HL: Halbleiterphysik
HL 4: New materials
HL 4.7: Talk
Monday, March 27, 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 Grundmann1 — 1Universität 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.