Dye-sensitized solar cells
1643
materials have good thermal stability, good open-circuit voltages and fill factors but
moderate power conversion. We have found that the conjugated backbone containing
fluorene benefits ICT increases the generation of photocurrent. The ꢃ of P1–P4 are
0.34%, 0.29%, 0.56%, and 0.23%, respectively, suggesting further optimization is
essential before application in DSSCs.
To obtain outstanding ꢃ, there are still many challenges. First, Jsc based on all the
materials is very low due to low adsorption affinities on the TiO2; anchoring groups
such as ꢀCN, ꢀCOOH, or ꢀSO3H should be introduced in the structure. Structural
optimization with broad spectral coverage and excellent charge separation and
transportation are expected to produce more efficient photosensitive dyes. Our work
in these directions is underway.
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