Hierarchical self-assembly of all-organic photovoltaic devices |
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Authors: | Chih-Hao Huang Alexander Kuhn Dario M Bassani |
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Institution: | a LCOO/CNRS UMR 5802, Centre de Recherche en Chimie Moléculaire, Université Bordeaux 1, 33405 Talence, France b LACReM, ENSCPB Université Bordeaux 1, 33607 Pessac, France c Institut de Chimie de la Matiére Condenseé de Bordeaux-CNRS, Université Bordeaux 1, 87 Avenue du Dr. Schweitzer, F-33608 Pessac, France |
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Abstract: | Photovoltaic devices built by a hierarchical self-assembly process using hydrogen-bonding terminated self-assembled monolayers (SAMs) on gold and the combination of a hydrogen-bonding barbituric acid appended fullerene and a complementary melamine terminated π-conjugated thiophene-based oligomer are presented. The incorporation of these electron donor (oligomer) and electron acceptor (methanofullerene) assemblies into simple photovoltaic (PV) devices as thin films leads to a 2.5 fold-enhancement in photocurrent compared to analogous systems comprising non-hydrogen-bonding C60-oligomer systems, which is ascribed to higher molecular-level ordering. The modification of the gold electrode surface with self-assembled monolayers bearing hydrogen-bonding molecular recognition endgroups was seen to further enhance the PV response of the corresponding functional supramolecular device. This superposition of two types of self-assembly facilitates the generation of binary supramolecular fullerene-containing architectures. Importantly, all functional materials are accessible in a direct fashion. |
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Keywords: | Oligomer Fullerene Electron donor Hydrogen-bonding Photovoltaic Self-assembly |
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