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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.52: Poster

Montag, 7. März 2005, 18:00–20:00, Poster TU A

Anisotropic optical properties of poly(3-hexylthiophene)/fullerene composite films — •Uladzimir Zhokhavets¹, Tobias Erb¹, Gerhard Gobsch¹, Harald Hoppe², and N. Serdar Sariciftci² — ¹Institute of Physics, Ilmenau Technical University, PO Box 100565, D-98693 Ilmenau, Germany — ²Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University Linz, Altenbergerstr.69, A-4040 Linz, Austria

P3HT/PCBM- (poly[3-hexylthiophene-2,5-diyl]/ [6,6]-phenyl C61 butyric acid methyl ester) composites are promising materials for organic solar cells. The anisotropic optical properties of thin P3HT/PCBM-films were studied by spectroscopic ellipsometry. The optical anisotropy of the films is related to the preferred orientation of polymer molecules parallel to the substrate. Significant changes are observed both in parallel and perpendicular components of the dielectric function after annealing. In particular, the optical anisotropy is increased and the absorption maximum is shifted to lower photon energies for the annealed films. These changes are attributed to the formation of polymer crystallites upon annealing.