The Function of TiO₂ with Respect to Sensitizer Stability in Nanocrystalline Dye Solar Cells

Figure 10

Compares the N3 ruthenium complex, both, in the state of rapid electron recovery (Figure 10(a)) and in the state of electron extraction via a reasonably high photocurrent flow (Figure 10(b)). While present in the TiO₂ interphase, the injected electron may convert Ti⁴⁺ into Ti³⁺ enabling a back bonding reaction facilitating a temporary Ti³⁺(ligand)Ru³⁺ charge transfer complex.

(a)

(b)