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Solution processed {\gamma}-Fe2O3 nanoparticles via the solvothermalcolloidal synthesis in conjunction with ligand-exchange method are used forinterface modification of the top electrode in inverted perovskite solar cells.In comparison to more conventional top electrodes such as PC(70)BM/Al andPC(70)BM/AZO/Al, we show that incorporation of a {\gamma}-Fe2O3 provides analternative solution processed top electrode (PC(70)BM/{\gamma}-Fe2O3/Al) thatnot only results in comparable power conversion efficiencies but also improvedthermal stability of inverted perovskite photovoltaics. The origin of improvedstability of inverted perovskite solar cells incorporating PC(70)BM/{\gamma}-Fe2O3/Al under accelerated heat lifetime conditions is attributed tothe acidic surface nature of {\gamma}-Fe2O3 and reduced charge trapped densitywithin PC(70)BM/ {\gamma}-Fe2O3/Al top electrode interfaces.

Nanoparticulate Metal Oxide Top Electrode Interface Modification Improves the Thermal Stability of Inverted Perovskite Photovoltaics