A new alternating copolymer of cyclopenta[2,1-b;3,4-b']dithiophene and thieno[3,4-c]pyrrole-4,6-dione for high performance polymer solar cells

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DOIResolve DOI: http://doi.org/10.1002/adfm.201100708
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TypeArticle
Journal titleAdvanced Functional Materials
Pages# of pages: 24
SubjectConjugated Polymers; Polymer Solar Cells; Photovoltaic Devices; Bulk Hereojunction
AbstractA series of alternating copolymers of cyclopenta[2,1-b;3,4-b´]dithiophene (CPDT) and thieno[3,4-c]pyrrole-4,6-dione (TPD) have been prepared and characterized for polymer solar cell (PSC) applications. Different alkyl side chains, including butyl (Bu), hexyl (He), octyl (Oc), and 2-ethylhexyl (EH), are introduced to the TPD unit in order to adjust the packing of the polymer chain in the solid state, while the hexyl side chain on the CPDT unit remains unchanged to simplify discussion. The polymers in this series have a simple main chain structure and can be synthesized easily, have a narrow band gap and a broad light absorption. The different alkyl chains on the TPD unit not only significantly influence the solubility and chain packing, but also fine tune the energy levels of the polymers. The polymers with Oc or EH group have lower HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy levels, resulting higher open circuit voltages (Voc) of the PSC devices. Power conversion efficiencies (PCEs) up to 5.5% and 6.4% are obtained from the devices of the Oc substituted polymer (PCPDTTPD-Oc) with PC61BM and PC71BM, respectively. This side chain effect on the PSC performance is related to the formation of a fine bulk heterojunction structure of polymer and PCBM domains, as observed with atomic force microscopy.
Publication date
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; NRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedNo
NRC number52252
NPARC number18215293
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Record identifierc17c6b09-ac8c-48b6-902e-fdee6513ba60
Record created2011-07-06
Record modified2016-05-09
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