Novel cyanine dyes with different methine chains as sensitizers for nanocrystalline solar cell

Abstract Novel cyanine dyes (Sqb and Cyb3) with carboxylbenzyl group and different methine chains as solar cell sensitizers were synthesized and the photoelectrochemical behaviors of the TiO 2 nanocrystalline electrode sensitized by them were investigated. The results show that I sc (2.76 mA/cm 2 ), monochromatic incident photon-to-current conversion efficiency (IPCE) (46%) and η (1.7%) of TiO 2 nanocrystalline solar cell sensitized by Sqb were higher than that of TiO 2 nanocrystalline solar cell sensitized by Cyb3 when TiO 2 nanostructured porous film was 6.5 μm thick and was sensitized for 6 h and 4 h, respectively. The excited state level of these dyes matches the conductive band edge of TiO 2 nanoparticles. Therefore, the sensitization of the dyes can increase the photocurrent density of TiO 2 nanocrystalline electrode.

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