Al Pyridine Ruthenium Salts, The Synthesis And Characterization Of Dye Sensitizer And Performance Research

Dye-sensitizer, which can produce photonics and inject them into TiO2conduction band, is one of the key materials of the dye-sensitized solar cells (DSSC), and has widely studied in recently years. Up to now, many kinds of dye-sensitizers have been synthesized, such as suthenium bipyridine complexes, porphyrin, phthalocyanines and pure organic dyes. Among these sensitizers, Ruthenium bipyridine complexes such as N3, N719, black dye are the state-of-art sensitizers with the feature of high photoelectric conversion efficiency, and they are generally selected as references dye for the development of novel dyes. It is known that the study on the salt type dye-sensitizers similar with N719is few. So in this thesis, the synthesis and perperties of ruthenium bipyridine complexes and their salt derivativces were performed. The contents mainly include the following three aspects:1. The optimization of synthesis and purification methods of N3. N3was synthesized using2,2’-bipyridine-4,4’-acid and ruthenium trichloride as raw materials through the complexation and substitution reactions, with the overall yield up to27.5%(calculated with RuCl3·3H2O). The structure was characterized by IR and1H-NMR. The synthetic and purification conditions were optimized, which resulted in a short reaction time of3hours and a high yield of91.8%(80.9%for reference method), as well as a high purification yield up to65.7%, The HPLC purity of N3could reach98.5%.2. The development of new bipyridine ruthenium complex salts dye. Imidazole was introduced to molecular in the way of forming salts and a kind of bipyridine ruthenium salt dye sensitizer with longer conjugated structure was designed and synthesized. The total yield was57.9%, and the final compounds was characterized by IR and1H-NMR. The intermediate N3-MZ was purified by column chromatography, and the analytic method of purity was established by HPLC. Dye sensitizer N719was synthesized as a reference dye to carry out an overall assessment to the performance of N3MZ. It was shown that the characteristic absorption peak for bipyridine ruthenium in UV-visible absorption spectra was found in380and530nm for both N3MZ and N719. compared with N719, the maximum absorption wavelength of N3MZ had a red shift of8nm, while in fluorescence emission spectra, N3MZ exhibited a red shift of10nm. The photovoltaic tests showed that N3MZ revealed high photoelectric conversion efficiency with an open circuit voltage (Voc) of0.73V, a short circuit current (Isc) of8.95mA/cm2and an efficiency (η) of3.91%, while the Voc, Isc and η of N719was0.75V,9.74mA/cm2and4.16%respectively under the same test condition.3. Synthetic conditions between series of heterocyclic compounds with N3were explored, and other two bipyridine ruthenium salts were also prepared.