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Proceedings Paper

Optimization of electron transport and cathode materials for efficient organic solar cells
Author(s): Alexander Colsmann; Johannes Junge; Thomas Wellinger; Christian Kayser; Uli Lemmer
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Paper Abstract

In this work we discuss improvements of organic solar cells based on poly(3-hexylthiophene-2,5-diyl) : C61-butyric acid methyl ester (P3HT:PCBM) blends. The polymer layer is combined with various electron transport materials and different cathodes. We were able to utilize the good charge carrier separation and transport properties of the P3HT:PCBM blend together with the flexibility of evaporated heterostructures. The systematic use of different cathodes such as calcium, aluminium/lithiumfluoride and organic intermediate layers resulted in higher fill factors and open circuit voltages compared to simple aluminium cathodes. In particular we studied the influence of additional layers of electron transport layer consisting of C60, lithium doped bathophenanthroline (BPhen:Li) 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) and 2,9- dimethyl-4,7-diphenyl-1,10-phenantrolene (BCP) on the cell properties. Solar cells with power conversion efficiencies well above 3% have been fabricated.

Paper Details

Date Published: 20 April 2006
PDF: 5 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619220 (20 April 2006); doi: 10.1117/12.663004
Show Author Affiliations
Alexander Colsmann, Univ. Karlsruhe (Germany)
Johannes Junge, Univ. Karlsruhe (Germany)
Thomas Wellinger, Univ. Karlsruhe (Germany)
Christian Kayser, Univ. Karlsruhe (Germany)
Uli Lemmer, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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