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Solution combustion synthesized hole transport layer of co-doped spinelnickel cobaltite were fabricated using doctor-blading technique for planarinverted perovskite solar cells. Perovskite solar cells incorporating Co-dopedspinel nickel cobaltite shown an increase in device performance parameterscompared to un-doped spinel nickel cobaltite, leading to PCE of 16.5%. X-rayphotoelectron spectroscopy measurements revealed the tendency of Cu cations toreplace preferably the surface Ni atoms changing the surface stoichiometry ofspinel nickel cobaltite inducing a cathodic polarization. Ultravioletphotoelectron spectroscopy measurements unveiled the increase of the ionizationpotential by 0.1 eV for co-doped spinel nickel cobaltite film compare toundoped spinel nickel cobaltite-based hole transporting layer. We attribute theenhanced PCE of inverted perovskite solar cells presented due to improved holeextraction properties of co-doped spinel nickel cobaltite hole transportinglayer.

Enhanced Photovoltaic Performance of Perovskite Solar Cells by Co-Doped Spinel Nickel Cobaltite Hole Transporting Layer