Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 61: Organische Halbleiter
HL 61.7: Talk
Wednesday, March 9, 2005, 12:15–12:30, TU P270
Structural properties of thin P3HT/PCBM-films for organic solar cells — •Tobias Erb1, Uladzimir Zhokhavets1, Gerhard Gobsch1, Sofiya Raleva2, Bernd Stühn2, Pavel Schilinsky3, Christoph Waldauf3, and Christoph Brabec3 — 1Institute of Physics, Ilmenau Technical University, 98684 Ilmenau, Germany — 2Institute of Solid Physics, Darmstadt Technical University, 64289 Darmstadt, Germany — 3Konarka Technologies GmbH, Paul-Gossen-Str. 100, 91052 Erlangen, Germany
We have investigated thin P3HT/PCBM - (poly[3-hexylthiophene 2,5 diyl]/[6,6]-phenyl C61 butyric acid methyl ester) films, which are widely used as an active layer in plastic solar cells. Their structural properties were studied by X-ray diffraction in grazing incidence geometry. The size and the orientation of crystalline P3HT-nanodomains within the films were determined. Contrarily, PCBM crystallites were not detected in thin films. Upon annealing, the P3HT-crystallinity is increased, whereas PCBM crystallites were not found.
With these results the raise of the optical absorption and spectral photocurrent in low photon energy region can be explained. In addition, the efficiency of P3HT/PCBM solar cells is also significantly increased upon annealing.