Poly(silylene)s: Effect of polar acceptor side groups on the charge carrier photogeneration and transport

The influence of polar electron-acceptor chromophores (both admired and cov alently bonded to the polymer backbone) on photoelectrical properties of po ly[methyl(phenyl)silylene] was studied. Whereas the charge carrier mobility decreased for any concentration of the chromophore, the photogeneration ef ficiency increased for concentrations up to about 4 more %. For higher conc entrations, some decrease was observed. The decrease in mobility was ascrib ed to the electron-dipole interaction and to the broadening of the density- of-states distribution affecting the hopping transport.