Journal of Materials Chemistry A · 2014 · 27 citations · 39 references
Natural SciencesChemistryMaterials ScienceElectronic MaterialsOrganic ChemistrySemiconductor MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsCarrier MobilityCharge Carrier MobilityCharge TransportHole TransportOrganic Photovoltaic CellsOrganic PhotovoltaicsOrganic Solar CellsPhotovoltaic Efficiency
Two solution-processed asymmetrical squaraines (ASQs) with cyclopenta[b]indolinyl (1a) and cyclopenta[b]indolyl (1b) as end cappers have been designed and synthesized. Although the internal molecular structure variations are minimal, the presence of the cyclopenta[b]indolinyl group endows 1a more planar molecular structure, which results in a much more compact solid-state structure (density is 1.317 g cm−3 for 1a but is 1.187 g cm−3 for 1b), dramatically affecting charge transport in the thin films. The hole mobility of 1a:PC71BM blended film is about 7 times higher than that of 1b:PC71BM. Consequently, the maximum power conversion efficiency (PCE) value of the organic photovoltaic cells (OPVs) based on 1a of up to 4.1%, approximately 80% higher than that of 1b, is one of the highest PCEs achieved for ASQ-based bulk-heterojunction (BHJ) OPVs.
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Efficient two layer leds on a polymer blend basis
J. Pommerehne, H. Vestweber, W. Guss et al. · Advanced Materials · 1995 · 1.6K citations
Natural Sciences, Materials Engineering, Materials Science +17