Research Article

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2014, 7(5): 679–693

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https://doi.org/10.1007/s12274-014-0428-9

Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures

Maria Vasilopoulou1 (*), Antonios M. Douvas1, Dimitra G. Georgiadou1, Vassilios Constantoudis1, Dimitris Davazoglou1, Stella Kennou2, Leonidas C. Palilis3, Dimitra Daphnomili4, Athanassios G. Coutsolelos4, and Panagiotis Argitis1

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1 Institute of Nanoscience and Nanotechnology (INN), National Center for Scientific Research Demokritos, 153 10 Aghia Paraskevi Attikis, Athens, Greece
2 Department of Chemical Engineering, University of Patras, 26500 Patras, Greece
3 Departmen of Physics, University of Patras, 26500 Patras, Greece
4 Laboratory of Bioinorganic Chemistry, Chemistry Department, University of Crete, Voutes Campus, 71003 Heraklion, Crete, Greece

Keywords: porphyrins, OLEDs, OPVs, aggregates
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  • Abstract
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We report on large work function shifts induced by the coverage of several organic semiconducting (OSC) films commonly used in organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs) with a porphyrin aggregated layer. The insertion between the organic film and the aluminum cathode of an aggregated layer based on the meso-tetrakis(1-methylpyridinium-4-yl) porphyrin chloride (porphyrin 1), with its molecules adopting a face-to-face orientation parallel to the organic substrate, results in a significant shift of the OSC work function towards lower values due to the formation of a large interfacial dipole and induces large enhancement of either the OLED or OPV device efficiency. OLEDs based on poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-2,1’,3-thiadiazole)] (F8BT) and incorporating the porphyrin 1 at the cathode interface exhibited current efficiency values up to 13.8 cd/A, an almost three-fold improvement over the efficiency of 4.5 cd/A of the reference device. Accordingly, OPVs based on poly(3- hexylthiophene) (P3HT), [6,6]-phenyl-C61 butyric acid methyl ester (PC61BM) and porphyrin 1 increased their external quantum efficiencies to 4.4% relative to 2.7% for the reference device without the porphyrin layer. The incorporation of a layer based on the zinc meso-tetrakis (1-methylpyridinium-4-yl)porphyrin chloride (porphyrin 2), with its molecules adopting an edge-to-edge orientation, also introduced improvements, albeit more modest in all cases, highlighting the impact of molecular orientation.
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Large work function shift of organic semiconductors inducing enhanced interfacial electron transfer in organic optoelectronics enabled by porphyrin aggregated nanostructures. Nano Res. 2014, 7(5): 679–693 https://doi.org/10.1007/s12274-014-0428-9

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