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20 April 2006 Optimization of electron transport and cathode materials for efficient organic solar cells
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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.
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Alexander Colsmann, Johannes Junge, Thomas Wellinger, Christian Kayser, and Uli Lemmer "Optimization of electron transport and cathode materials for efficient organic solar cells", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619220 (20 April 2006);

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