The photophysical properties of eight structurally diverse near-infrared cyanine dyes were investigated with respect to their structural features and potential use as light-harvesting sensitizers of dye sensitized solar cells. The absorption, emission, and lifetime characteristics of the dyes were assessed. Three of the eight cyanine dyes had an additional six-membered cyclic ring. The photophysical properties and sensitizing efficiency of three of the eight dyes, with an additional six-membered cyclic ring, were markedly different from the other five. The dyes absorbed light of wavelength within the range of 779 - 823 nm and emitted within the range of 832 – 876 nm. The surface morphology and elemental analysis of the cyanine dye sensitized photoanodes were characterized via Field-Emission Scanning Microscopy Imaging (FESEM) and Transmission electron microscopy (TEM). The current-voltage characteristics and the electrochemical impedance spectroscopic studies were also carried out. The dyes had fluorescence quantum yield in the range of 14 – 22%.

Photophysical properties of near infrared cyanine dyes and their application as photosensitizers in dye sensitized solar cells

254th National Meeting (2017)

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