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Metal ruthenium complex dyes in dye -sensitized solar cells have achieved conversion efficiency of over 11 % , but due to its high cost , the impact on the environment caused by pollution , and therefore can not be large-scale application . While pure organic dye having a high molar extinction coefficient, low cost , etc. , is expected to be applied to the dye-sensitized solar cell , to become the focus of current research and hotspot , represents the direction of the future development of the dye . Respond to the dye requirements as well as the latest trends , we designed the D-π-A structure pure organic dye C217 , C218 , C219 , and designed by SuzukiCoupling, Vilsmeier-Haak reaction and Knoevenagel Condensation Reaction Synthesis of dye and by UV absorption , square wave voltammetry , NMR and other means of testing the structure and properties of the characterization and testing . The results show that the three dyes having a high molar extinction coefficient , the appropriate redox potential . Standard under simulated sunlight test 2.6μm membrane , respectively, 7.85% , 9.08% , 8.02% efficiency . And the system in acetonitrile electrolyte device , smaller solvation effect has good stability , not easily desorbed . In addition, we compared the absorption spectra of the three dyes found strong electron donating group is introduced in the electron donor , and can effectively promote the absorption spectrum of the dye redshift electron body branched absorption spectrum almost does not produce any , only able to increase the solubility of the dye molecules .
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