Self-assembled monolayers of porphyrin-perylenetetracarboxylic diimide-[6G] fullerene on indium tin oxide electrodes: enhancement of light harvesting in the visible light region

摘要

The porphyrin-perylenetetracarboxylic diimide-fullerene triad has been designed to act as an efficient light-to-current converter in molecular devices. Light absorption by the perylenetetracarboxylic diimide-poiphyrin dyad occurs in complementary regions, giving extended absorption in the visible light region. This dyad of perylenetetracarboxylic diimide-porphyrin was covalently linked with C_(60) which can act as an electron acceptor, to construct porphyrin-perylenetetracarboxylic diimide-fullerene (FPP) self-assembled monolayers (SAMs) on the indium tin oxide (ITO) surface. The relative strong photocurrent generation of the ITO/FPP/ methyl viologen (MV2+)/Pt system in the continuous visible light region (from 400 to 650 nm) indicated that this system is highly promising as regards light-energy conversion.