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

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 

作者机构：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 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2014年第7卷第5期

页      面：679-693页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：funded this research Project BIOSOLENUTI Special Research Account of UoC, Heraklitos grant from Ministry of Education, and GSRT 

主　　题：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 

摘      要：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.