Using ZnCoO nanoparticles as the hole transport layer to improve long term stability of perovskite solar cells.

Inorganic metal oxides with the merits of high carrier transport capability, low cost and superior chemical stability have largely served as the hole transport layer (HTL) in perovskite solar cells (PSCs) in recent years. Among them, ternary metal oxides have gradually attracted attention because of the wide tenability of the two inequivalent cations in the lattice sites that offer interesting physicochemical properties. In this work, ZnCoO nanoparticles (NPs) were prepared by a chemical precipitation method and served as the HTL in inverted PSCs.