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.