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Abstract

Series of dyes containing a fluorene entity in the spacer have been designed, synthesized, and characterized. These dipolar compounds contain an arylamine or dialkylamine as the electron donor, a 2-acrylic acid as the electron acceptor, and a conjugated spacer between the donor and the acceptor. Typical dye-sensitized solar cells (DSSCs), with an appropriate illumination area, were fabricated with a liquid electrolyte composed of iodide reagent in polar solvent. The device performance data were obtained under AM 1.5 illumination. DSSCs using these materials as the sensitizers exhibited good performance (η), ranging from 4.58 %-5.82 %, which reached 67 %-85 % with respect to that of the standard cell from N719- based device fabricated under similar condition. Further structural modifications to improve "photon-to-current efficiencies "(IPCE) is in progress. The patent is pending.

The general configuration of organic dye

The structure of six new dyes

Synthesis of organic dye 1 and 2

Synthesis of organic dye 3 and 4

Synthesis of organic dye 5 and 6

Performance parameters of DSSCsDSSCs constructed dyesconstructed using the dyes

I-V curves of DSSCs based on the dyes

Conclusion

• We have successfully synthesized dipolar compounds where the electron-donating aryl(alkyl)amine and electron-accepting 2- cyanoacrylic acid were linked by fluorene-containing spacer.



• The best performance of the device reaches ~85 % of N719-based DSSC (6.81 %) fabricated and measured under similar conditions.



• It only takes three synthetic steps to produce the dye 3 which has the best performance of the DSSC.