Benzoyl side-chains push the open-circuit voltage of PCDTBT/PCBM solar cells beyond 1 V
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Peer-reviewed
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Abstract
The synthesis, characterization and solar cell performance of PCDTBT and its highly soluble analogue hexyl-PCDTBT with cross-conjugated benzoyl moieties at the carbazole comonomer are presented. Through the use of both model reactions and time-controlled microwave-assisted Suzuki polycondensation, the base-induced cleavage of the benzoyl group from the polymer backbone has been successfully suppressed. Compared to the commonly used symmetrically branched alkyl motif, the benzoyl substituent lowers the energy levels of PCDTBT as well as the band gap, and consequently increases energy of the charge transfer state in blends with PC71BM. As a result, photovoltaic diodes with high-open circuit voltage of above 1 V are realized.
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Keywords
PCDTBT, benzoyl side chains, cross conjugation, conjugated polymers, high open-circuit voltage, solar cells
Journal Title
Organic Electronics: physics, materials, applications
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Journal ISSN
1566-1199
1878-5530
1878-5530
Volume Title
49
Publisher
Elsevier
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Sponsorship
Engineering and Physical Sciences Research Council (EP/G060738/1)