Abstract
ABSTRACT In this work we discuss improvements of organic solar cells based on poly(3-hexylthiophene-2,5-diyl) : C 61 -butyric acid methyl ester (P3HT:PCBM) blends. The poly mer layer is combined with various electron transportmaterials and dierent cathodes. We were able to utilize the good charge carrier separation and transportproperties of the P3HT:PCBM blend together with the exibility of evaporated heterostructures.The systematic use of dierent cathodes such as calcium, aluminium/lithiumuoride and organic intermediatelayers resulted in higher ll factors and open circuit voltages compared to simple aluminium cathodes.In particular we studied the inuence of additional layers of electron transport layer consisting of C 60 , lithiumdoped 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 eciencies well above 3% have been fabricated.Keywords: organic photovoltaics, solar cell, ca thode, electron transport layer
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