Photo-induced electron transfer from a dithienothiophene-based polymer to tio2

A spectroscopical study of composites made with a new conjugated polymer, polydithienothiophene, and nanocrystalline TiO2 is carried out by optical absorption, photoluminescence and steady state photo-induced absorption spectroscopy. Sinter ed nanoporous TiO films have been stained by dipping the inorganic semiconductor films into dithienothiophene polymer solutions. The optical absorption spectra indicate that this polymer is well absorbed into nanoporous TiO films, showing a remarkable interaction with the inorganic semiconductor as compared to other alkyl substituted thiophene based conjugated polymers.Thephotoluminescence quenching and the steady state photo-induced absorption spectra evidence that TiO acts as an efficient electron acceptor toward the polymer in the excited state.These features indicate that this conjugated polymer is a promising material to develop new hybrid organicyinorganic photovoltaic cells.