Palladium catalyzed direct coupling of 5-bromo-2-furaldehyde with furfural and thiophene derivatives
作者:Tuomo P. Kainulainen、Juha P. Heiskanen
DOI:10.1016/j.tetlet.2016.09.097
日期:2016.11
2-furaldehyde (furfural) and 5-bromo-2-furaldehyde using the air-stable catalyst Pd(OAc)2 and the air-stable ligand P(t-Bu)3HBF4 was examined. The developed procedure was used to functionalize thiophene containing moieties commonly found in organic electronics. The aromatic CH bond activated coupling with 5-bromo-2-furaldehyde afforded novel compounds with useful 5-heteroaryl-2-furaldehyde type functionality
Influence of the Position of the Side Chain on Crystallization and Solar Cell Performance of DPP-Based Small Molecules
作者:Veronique S. Gevaerts、Eva M. Herzig、Mindaugas Kirkus、Koen H. Hendriks、Martijn M. Wienk、Jan Perlich、Peter Müller-Buschbaum、René A. J. Janssen
DOI:10.1021/cm4034484
日期:2014.1.28
Three isomeric a-conjugated molecules based on diketopyrrolopyrrole and bithiophene (DPP2T) substituted with hexyl side chains in different positions are investigated for use in solution-processed organic solar cells. Efficiencies greater than 3% are obtained when a mild annealing step is used. The position of the side chains on the DDP2Ts has a major influence on the optical and electronic properties of these molecules in thin semicrystalline films. By combining optical absorption and fluorescence spectroscopy, with microscopy (AFM and TEM) and scattering techniques (GIWAXS and electron diffraction), we find that the position of the side chains also affects the morphology and crystallization of these DPP2Ts when they are combined with a C-70 fullerene derivative in a thin film. The study demonstrates that changing the side chain position is an additional, yet complex, tool to influence behavior of conjugated molecules in organic solar cells.