Versatile ruthenium(II) dye towards blue-light emitter and dye-sensitizer for solar cells

By Zanoni, Kassio P. S.; Amaral, Ronaldo C.; Iha, Neyde Y. Murakami; Abreu, Felipe D.; Carvalho, Idalina M. M. de
Published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2018

Abstract

A versatile Ru(II) complex bearing an anthracene moiety was synthesized in our search for suitable compounds towards efficient molecular devices. The new engineered dye, cis?[Ru(dcbH2)(NCS)2(mbpy?anth)] (dcbH2=2,2??bipyridyl?4,4??dicarboxylic acid, mbpy?anth=4?[N?(2?anthryl)carbamoyl]?4??methyl?2,2??bipyridine), exhibits a blueish emission in a vibronically structured spectrum ascribed to the fluorescence of a 1LCAnth (ligand centered) excited state in the anthracene and has a potential to be exploited in the fields of smart lighting and displays. This complex was also employed in dye-sensitized solar cells with fairly efficient solar energy conversion with the use of self-assembled TiO2 compact layers beneath the TiO2 mesoporous film to prevent meso?TiO2/dye back reactions. Further photoelectrochemical investigations through incident photon-to-current efficiency and electrochemical impedance spectra showed that the all-nano-TiO2 compact layer acts as contact layers that increase the electron harvesting in the external circuit, enhancing efficiencies up to 50%.

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