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

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Nano Research 2014年第5期7卷 679-693页

作者： Maria Vasilopoulou Antonios M. Douvas Dimitra G. Georgiadou Vassilios Constantoudis dimitris davazoglou Stella Kennou Leonidas C. Palilis Dimitra Daphnomili Athanassios G. Coutsolelos Panagiotis Argitis Institute of Nanoscience and Nanotechnology (INN) National Center for Scientific Research "Demokritos' 153 10 Aghia Paraskevi Attikis Athens Greece Department of Chemical Engineering University of Patras 26500 Patras Greece Departmen of Physics University of Patras 26500 Patras Greece Laboratory of Bioinorganic Chemistry Chemistry Department University of Crete Voutes Campus 71003 Heraklion Crete Greece

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.

关键词：有机半导体功函数卟啉电子转移纳米结构诱导有机发光二极管分子取向

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