, where light absorption and charge separation take place in the same material In this case, the external potential (positive bias for n-type and negative bias for p-type semiconductors) facilitates light-induced charge separation and retards charge recombination in the semiconductor by introducing more band bending, leading to a higher photocurrent at more positive (photoanode) or more negative potential (photocathode) . However, whether an applied potential has the same effect on DSPEC cells with their configuration based on lightinduced charge separation at the dye-semiconductor interface rather than inside the semiconductor is unknown, although some dye-sensitized photocathodes show surprisingly low photocurrents at more negative bias potentials. The composition of the electrolyte may also play an important role here.