Efficient co-sensitization of dye-sensitized solar cells by novel porphyrin/triazine dye and tertiary aryl-amine organic dye

摘要: A novel porphyrin dye ZnP-triazine-(gly)2, consisting of a zinc-metallated unit covalently linked through its peripheral aryl-amino group with 1,3,5-triazine which is functionalized by two carboxylic acid groups glycine moieties, has been synthesized. Photophysical and electrochemical measurements, as well theoretical DFT calculations, suggest that the compound exhibits appropriate light absorption characteristics frontier molecular orbital levels for use sensitizer in dye-sensitized solar cells (DSSCs). The ZnP-triazine-(gly)2 based cell was found to exhibit power conversion efficiency (PCE) value 4.72%. significant improvement overall photovoltaic achieved up 7.34% upon co-sensitization tertiary aryl-amine D ethynyl-pyridine substituents cyano-acetic anchoring group, complementary dye. higher PCE co-sensitized attributed enhanced short circuit current (Jsc), due improved harvesting efficiency, reduced aggregation, faster electron injection charge collection, open voltage (Voc), increased density TiO2 conduction band photoanode. These results are accordance impedance spectra (EIS) cells, revealed recombination resistance (Rrec), longer lifetime (τe), shorter transport time (τd) cell.