Optical excitations of high electron affinity substituted polythio phene derivatives

Summary form only given. We have studied polythiophene derivatives substituted with high electron affinity groups. The chemically synthesized monomers reported in this work are the basic monomer & Butylthio phene, and the following acceptor groups. AcGI: 3-(4-Nitrobenzene-1,2-ethen)Thiophene, AcG2: 3-(4-Nitrobenzene-1,4-butadiene)Thiophene, and AcG3: 3-(4-Nitrobenzene-bis(Di-1,2-ethen) benzene)Thiophene. The polymers studied are the chemically prepared homopolymer poly 3 Butylthiophene (PBuT), and the three co-polymers AcG/PBuT with mixing ratio between 1:3 and 1:7.