Morphology control in polycarbazole based bulk heterojunction solar cells and its impact on device performance

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DOIResolve DOI: http://doi.org/10.1063/1.3601474
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TypeArticle
Journal titleApplied Physics Letters
ISSN0003-6951
Volume98
Issue25
Article number253301
SubjectActive area; Active Layer; Attraction force; Benzothiadiazoles; Bulk heterojunction solar cells; Device performance; Domain structure; Interchain interactions; Morphology control; Ortho-dichlorobenzene; Photovoltaic performance; Polycarbazoles; Polymer chains; Polymer-solvent interactions; Power conversion efficiencies; Amides; Conversion efficiency; Dimethyl sulfoxide; Hole mobility; Morphology; Polycyclic aromatic hydrocarbons; Polymer films; Polymers; Solar power generation; Heterojunctions
AbstractIncremental increase in dimethyl sulfoxide (or dimethyl formamide) in ortho-dichlorobenzene solution of poly [N -heptadecanyl-2,7-carbazole-alt-5,5- (4′, 7′ -di-2-thienyl- 2′, 1′, 3′ -benzothiadiazole)] (PCDTBT) gradually reduces the polymer-solvent interaction, the attraction forces between polymer chains become more dominant, and the polymer chains adopt a tight and contracted conformation with more interchain interactions, resulting in a progressive aggregation in both solutions and films. This was used to fine tune the morphology of PCDTBT/ PC71 BM based solar cells, leading to improved domain structure and hole mobility in the active layer, and significantly improved photovoltaic performance. The power conversion efficiency increased from 6.0% to 7.1% on devices with an active area of 1.0 cm2. © 2011 Crown.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21271576
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Record identifierb7982956-7034-456d-b67b-ce7d0385f794
Record created2014-03-24
Record modified2016-05-09
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