Compared to those cells based on the dyesSDD4andRD, the
relatively lower photovoltaic performance of double DeAdyes
SDD1e3-sensitized cells was due to their relatively lower shortcircuit photocurrent density (Jsc), which could be ascribed to the
donor of indole with weak and narrow light-harvesting ability in
the visible region. On the other hand, the cell based onSDD3shows
higher efficiency compared to theSDD1andSDD2based cells due
to its higherJscand higherVoc. The higher Jscmay be attributed to
the relatively bigger dye loading on the TiO2surface, and the higher
Vocmay be ascribed to then-hexyl, which hinders the dyeSDD3
aggregation on TiO2more effectively. Furthermore, the cell based
onSDD1exhibited lowerhdue to its lower dye loading amount,
which resulted from the rigid and large linker of 1,4-phenylenebis(methylene).