Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 25: Organische Halbleiter II
HL 25.2: Vortrag
Dienstag, 25. März 2003, 15:30–15:45, BEY/81
Anisotropic optical properties of the thin poly(3-octylthiophene)-films — •Uladzimir Zhokhavets1, Gerhard Gobsch1, Harald Hoppe2, and Niyazi Serdar Sariciftci2 — 1Institute of Physics, Ilmenau Technical University, D-98684 Ilmenau, Germany — 2Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, A-4040 Linz, Austria
We have determined the anisotropic dielectric function of thin spin-coated and drop-cast poly(3-octylthiophene)-films from both near-normal reflectance and transmittance data and from the spectroscopic ellipsometry. The influence of the growth parameters (such as spin frequency, concentration of the polymer in solvent, type of solvent) on the anisotropic dielectric function of the film was investigated. The anisotropy of the dielectric function is related to the orientation of the polymer chains in the film. The optical anisotropy of spin-coated films increases with increasing spin frequency and decreasing polymer concentration in the solvent, indicating that polymer chains become more aligned parallel to the substrate. The drop-cast films were also found to be anisotropic. All results are discussed in dependence of the film thickness.