Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 28, Issue 17, Pages 1781-1785Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200700239
Keywords
charge carrier mobility; interchain branching; organic solar cells; poly (3-hexylthiophene); solid state order
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The hole mobility and power conversion efficiency of bulk heterojunction solar cells based on P3HT-type donor polymers and the soluble fullerene derivative [6,6]-phenyl C-61 butyric acid methyl ester (PCBM) as an acceptor both show a strong sensitivity to the introduction of interchain branches into the P3HT backbones. Branched B-P3HT copolymers display a distinctly decreased hole mobility and reduced solar cell power conversion efficiency with increasing amount of interchain 3.3'-bithiophene branches within the polythiophene macromolecules. The results illustrate the primary importance of proper solid state packing towards optimum charge transport and solar cell performance.
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