Tuning of the Photoinduced Charge Transfer process in Donor-Acceptor Double-Cable Copolymers

We present a study on the photoinduced charge transfer properties of a series of alkylthiophene copolymers carrying antraquinone type acceptor molecules covalently linked to the conjugated backbone. FTIR phoinduced absorption and light-induced electron spin resonance (LESR) experiments demonstrate the photoinduced electron transfer from the polythiophene backbone to the anthraquinone moieties. By changing the content of acceptor molecules it is possible to tune the number of photogenerated charges as well as their lifetimes. Changes induced by the acceptors to the polythiophene properties are also observed and discussed.