Control of the Polymer Conformation and the Photoelectric Conversion Characteristics at the Semiconducting Polymer/Nanoporous TiO_2 Surface

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The interaction between poly(n-di-hexylsilane) (PDHS) and TiO_2 nanoparticle was studied based on the temperature dependence of the fluorescence spectra from the PDHS and TiO_2 nanoparticle hybrid film. The polysilane was a suitable probe to investigate a guest polymer-host matrix interaction because the photophysical properties of polysilanes seriously depend on the conformation of the a-conjugated Si-Si chain. The PDHS/TiO_2 nanoparticle hybrid film shows a fluorescence band assigned to a disordered structure even at 80 K, where the PDHS film shows only the fluorescence band of an ordered structure. The disordering of the Si-Si main chain caused by the perturbation of the n-hexyl side chain in the neighborhood of the TiO_2 nanosurface was suggested. The non-radiative deactivation of the excited state via the disordered site was suggested by the temperature dependence of the fluorescence intensities of the disordered and ordered structures in the temperature region from 80 to 160 K.