Spectroscopic characterization of selected fullerene–organic chromophore Langmuir–Blodgett films

Electronic absorption in polarized and unpolarized light and steady-state fluorescence emission and excitation spectra of zinc porphyrins, their dimers and dyads with a fullerene as well as perylene-derived molecular systems containing a fullerene were investigated. In particular, dyads of the fullerene covalently bonded to perylene- and porphyrin-derived dyes were comprehensively studied in chloroform solution and in a form of Langmuir–Blodgett layers on solid inorganic substrates. The spectroscopic examination of the samples allowed us to analysis charge redistribution after the chromophore–fullerene dyads formation – this effect was detected as changes of the band wavelengths and shape of the lines. The layer organization, in particular the dye molecule orientation, was estimated from. Usefulness of the investigated dyads in photovoltaic devices was signaled.