Financial support from the Bundesministerium für Bildung und Forschung (01SF0119) and the Thüringer Kultusministerium (20101276) is gratefully acknowledged.
Correlation Between Structural and Optical Properties of Composite Polymer/Fullerene Films for Organic Solar Cells†
Article first published online: 4 JUL 2005
Copyright © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 15, Issue 7, pages 1193–1196, July, 2005
How to Cite
Erb, T., Zhokhavets, U., Gobsch, G., Raleva, S., Stühn, B., Schilinsky, P., Waldauf, C. and Brabec, C. J. (2005), Correlation Between Structural and Optical Properties of Composite Polymer/Fullerene Films for Organic Solar Cells. Adv. Funct. Mater., 15: 1193–1196. doi: 10.1002/adfm.200400521
- Issue published online: 4 JUL 2005
- Article first published online: 4 JUL 2005
- Manuscript Accepted: 3 MAR 2005
- Manuscript Received: 9 NOV 2004
- Polymer films;
- Solar cells
We investigate thin poly(3-hexylthiophene-2,5-diyl)/[6,6]-phenyl C61 butyric acid methyl ester (P3HT/PCBM) films, which are widely used as active layers in plastic solar cells. Their structural properties are studied by grazing-incidence X-ray diffraction (XRD). The size and the orientation of crystalline P3HT nanodomains within the films are determined. PCBM crystallites are not detected in thin films by XRD. Upon annealing, the P3HT crystallinity increases, leading to an increase in the optical absorption and spectral photocurrent in the low-photon-energy region. As a consequence, the efficiency of P3HT/PCBM solar cells is significantly increased. A direct relation between efficiency and P3HT crystallinity is demonstrated.