Effects of Fused Thiophene Bridges in Organic Semiconductors for Solution-Processed Small-Molecule Organic Solar Cells

Three push-pull organic semiconductors, TPA-Th3-MMN (1), TPA-ThTT-MMN (2), and TPA-ThDTTMMN (3), comprising a triphenylamine donor and a methylene malononitrile acceptor linked by various π- conjugated thiophene units were synthesized, and the effects of the π-conjugated bridging unit on the photovoltaic characteristics of solution-processed small-molecule organic solar cells based on these semiconductors were investigated. Planar bridging units with extended π-conjugation effectively facilitated intermolecular π-π packing interactions in the solid state, resulting in enhanced Jsc values of the SMOSCs fabricated with bulk heterojunction films. KCI Citation Count: 6