Macromolecular Chemistry and Physics · 2012 · 36 citations · 47 references
Natural SciencesChemistryMaterials ScienceOptical MaterialsPolymer ChemistryPolymer MaterialsOptical PolymersOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic MaterialsPolymer CharacterizationSolar CellsBulk Heterojunction Solar CellsConjugated PolymersIntramolecular Electron TransferOrganic PhotovoltaicsPhase SegregationPhysical PropertiesPower ConversionPower Conversion Efficiency
Abstract π‐Conjugated copolymers consisting of squaraine dyes as light‐harvesting components and phenylene linkers ( PSQ ) are presented. They show intense absorption in visible (Vis) and near‐infrared (NIR) region, originating with the intramolecular charge transfer of the dye. Although their optical and electrochemical properties are dominantly derived from dye components, phenylene linkers affect aggregation in the solid state and phase segregation of the PSQ /PCBM composites. Bulk heterojunction solar cells consisting of PSQ /PCBM exhibit spectral response in Vis–NIR region, and they show power conversion efficiencies up to 0.64%. The copolymer approach to develop squaraine‐based polymers enables the auxiliary tuning of the physical properties that determine photovoltaic performance through the choice of linkers.
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