In this work we present the electrochemical and photoelectrochemical characterization of NiO thin films [thickness (l) range: 2 ≤ l ≤ 4 μm], which have been obtained from screen-printing of three precursor-pastes. All three pastes contained preformed NiO nanoparticles [diameter (Ø) range: 20 0.04%) and highest external quantum efficiency (EQE > 9% at 830 nm) with respect to the p-DSCs with NiO photocathodes of similar thickness, which have been prepared via different methods of deposition.