Chemical surface treatment of porphyrin-sensitised titania films
using bis-(4-methoxyphenyl)phosphinic acid after dye adsorption,
results in large improvements in DSSC efficiencies which originate
primarily from higher short circuit currents. The result was attributed
to a positive shift in the TiO2 quasi-Fermi level with simultaneous
retardation of charge recombination. High device
performances have been achieved even using simplified electrolyte
matrices devoid of the common additives, LiI and t-butylpyridine.