Chemistry - A European Journal · 2018 · 10 citations · 44 references
Natural SciencesChemistryMaterials ScienceOptoelectronicsOrganic ChemistryPolymer ChemistryOptoelectronic MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesPhotovoltaic MaterialsSolar CellsBulk Heterojunction Solar CellsEnergy Conversion EfficiencyOptical AbsorptionOrganic ElectronicsOrganic PhotovoltaicsOrganic Solar CellsPower ConversionPower Conversion Efficiency
Abstract A series of twisted N,N‐linked benzo[ ghi ]‐perylenetriimide dimers (t‐BPTI) with various lengths of the α‐branched alkyl side chain at the six‐membered imide ring position was designed, synthesized, and characterized. These compounds showed the low‐lying LUMO energy level of −3.78 eV, which was similar to that of PC 61 BM (−3.71 eV), but with intensive optical absorption in the range 350–500 nm. The twisted molecular geometry with two nearly perpendicular BPTI planes achieved a favorable nanoscale phase separation by relieving the self‐aggregation of rigid BPTI units in blend films. The acceptor t‐BPTI‐3 unit with the longest alkyl side chains has been demonstrated to be an efficient electron acceptor in solution‐processed bulk heterojunction organic photovoltaics (OPV), giving a power conversion efficiency of 3.68 % when using conjugated polymer PTB7‐Th as the donor and without additional treatments.
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Single-junction polymer solar cells with high efficiency and photovoltage
Zhicai He, Biao Xiao, Feng Liu et al. · Nature Photonics · 2015 · 1.7K citations