Effects of the molecular weight and the side-chain length on the photovoltaic performance of dithienosilole/thienopyrrolodione copolymers

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DOIResolve DOI: http://doi.org/10.1002/adfm.201102623
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TypeArticle
Journal titleAdvanced Functional Materials
ISSN1616301X
Volume22
Issue11
Pages23452351; # of pages: 7
Subjectphotovoltaic devices; solar cells; fullerenes; polymeric materials
AbstractA series of low-bandgap alternating copolymers of dithienosilole and thienopyrrolodione (PDTSTPDs) are prepared to investigate the effects of the polymer molecular weight and the alkyl chain length of the thienopyrrole-4,6-dione (TPD) unit on the photovoltaic performance. High-molecular-weight PDTSTPD leads to a higher hole mobility, lower device series resistance, a larger fill factor, and a higher photocurrent in PDTSTPD:[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) bulk-heterojunction solar cells. Different side-chain lengths show a significant impact on the interchain packing between polymers and affect the blend film morphology due to different solubilities. A high power conversion efficiency of 7.5% is achieved for a solar cell with a 1.0 cm2 active area, along with a maximum external quantum efficiency (EQE) of 63% in the red region.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number21268193
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Record identifierbfa82247-3f49-4bc2-a974-03430fb72c9e
Record created2013-05-29
Record modified2016-05-09
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