6178
Y. Liu et al.
Conclusions
Four novel D–A polymeric metal complexes dyes (P1–P4) containing alkyl
cyclopentadithiophene or an alkyl fluorene derivative as electron donor (D),
benzimidazole metal complex as the electron acceptor (A) and carboxyl group
(-COOH) as an anchor group were designed, synthesized, and applied for DSSCs.
All polymers exhibited good thermal stability, which is in line with the thermal
performance requirements of the photovoltaic device. Moreover, the optical
properties and photovoltaic properties of these polymeric metal complexes are also
investigated. The results show that the polymer with cyclopentadithiophene
derivatives and Cd(II) ion complexes exhibits better efficiency because of the
stronger electron-donating ability of the cyclopentadithiophene derivative and the
stronger complexing ability of the Cd(II) ion. Although the conversion efficiency of
DSSCs has a certain degree of improvement, compared with the traditional
ruthenium dyes, there is still a long way to go. Therefore, in our future work of
designing molecule structure for the dye, we must improve the molecular structure,
and try to make it redshift to expand the absorption range of the dye, and ultimately
improving the efficiency of DSSCs.
Acknowledgments This work was financially supported by the Open Project Program of Key
Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, China
(No. 09HJYH10).
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