The influence of polymer purification on the efficiency of poly(3-hexylthiophene):fullerene organic solar cells

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作者：
James H. Bannock
Neil D. Treat
Michael Chabinyc
Natalie Stingelin
Martin Heeney
John C. de Mello
机构：
[1] Centre for Plastic Electronics,Department of Chemistry
[2] Imperial College London,Department of Materials
[3] Imperial College London,undefined
[4] Imperial College London,undefined
[5] Materials Research Laboratory,undefined
[6] University of California Santa Barbara,undefined
来源：
Scientific Reports | / 6卷
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摘要：
We report the influence of different polymer purification procedures on the photovoltaic performance of bulk heterojunction solar cells formed from binary blends of poly(3-hexylthiophene) (P3HT) and fullerenes. Selective Soxhlet extractions and metal scavenging agents were used to remove residual monomer, magnesium salt by-products and catalyst from high-weight P3HT (Mw 121 kg/mol, PDI 1.8, RR 99%) synthesised by the Grignard metathesis (GRIM) polymerization route. Using phenyl-C61-butyric acid methyl ester (PC60BM) as an electron acceptor, we observed an increase in average power conversion efficiency from 2.3 to 4.8% in going from crude to fully purified material. Using indene-C60 bisadduct (IC60BA) in place of PC60BM, we observed a further increase to an average value of 6.6% - high for a bulk heterojunction formed from a binary blend of P3HT and C60 fullerene derivatives.
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