Figure 6. Energy band alignment of the photo-cathode components.

The arrows illustrate the desired process: the absorption of photons excites the dye, that leads to hole injection into LiFePO₄ particles; the injection of holes into the charged phase of FePO₄ is forbidden.The work functions of LiFePO₄ and FePO₄ are calculated as reported in this work; the energy band of N719 is adapted from the work of Zhang et al.⁶⁶.