Syntheses and Photovoltaic Performances of Pyrazine-Based Organic Photosensitizers for Dye-Sensitized Solar Cells
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In this study, we synthesized and characterized three novel heavy-atom-free organic photosensitizers for the dye-sensitized solar cells (DSSCs). Chemical structures of the pyrazine-based organic photosensitizers were designed with pyrazine derivatives as acceptors, triphenylamine groups as donors, and thiophene-cyanoacryl group as an auxiliary heterocyclic linkers-acceptor. To obtain excellent performances of the DSSCs using optimal TiO2 photoelectrode for the synthesized novel heavy-atom-free organic photosensitizers, three types of TiO2 photoelectrode were fabricated and evaluated for comparison. The relationship between photovoltaic effects and interfacial resistance characteristics of DSSCs using three novel heavy-atom-free organic photosensitizers adsorbed onto the three types of TiO2 photoelectrodes could be interpreted from interfacial resistances according to frequency through impedance analysis.