“…Last but not least, PSCs require corrosion-resistant electrodes with high conductivity and matching energy levels, [131] such as alloying metals (e. g., Au, Ag or Cu), [132][133][134] TCOs (e. g., ITO, FTO, ATO or AZO) [135][136][137][138] and carbon-based materials (e. g., graphene, carbon nanotubes or conductive polymers). [139][140][141] Furthermore, several common transparent metal oxide electron (e. g., ZnO, TiO 2 , SnO 2 ) and hole (e. g., NiO x , MoO x or CuO x ) transport materials will inevitably produce problematic hydroxyl group-rich oxides.…”