Abstract
The effect of the chemical structure of polymethine dyes on their spectral-luminescent and photovoltaic properties has been studied. It has been shown that the introduction of hydroxyl functional groups into the dye structure leads to a bathochromic shift of the absorption and fluorescence bands. During the adsorption of dyes on the surface of titanium dioxide, a shift of their spectra to the red wavelength region was recorded with a simultaneous broadening of the bands caused by dye aggregation on the semiconductor surface. A decrease in the lifetimes of the excited state of molecules by 64 and 30% was registered for dyes 1 and 2, respectively. Quenching of the fluorescence lifetimes of adsorbed molecules is the result of electron transfer from the dye to the semiconductor. Measurements of the photovoltaic parameters of the studied dye-sensitized solar cells showed a higher efficiency for the functionalized dye, which is associated with better adsorption of this compound on TiO2
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