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α-Fe 2 O 3  has been demonstrated to be a promising electron transporting material (ETL) for fabricating efficient perovskite solar cells (PSCs) with good stability under ultraviolet light compared to the commonly used TiO 2 . However, α-Fe 2 O 3  films need to be processed over 500 °C, which is a serious impediment to fabricate devices on the flexible substrates. Herein,  γ -Fe 2 O 3 , which could be deposited onto the substrates under room temperature, would be an alternative magnetic ETL with a reasonable performance. We report that pure and fine nano-sized  γ -Fe 2 O 3  particles can be synthesized below 200 °C and the corresponding compact layers have been fabricated by a simple room-temperature solution process. The methylammonium lead iodide (MAPbI 3 ) PSCs based on  γ -Fe 2 O 3  show a power conversion efficiency of 12.86% with a short circuit current (J sc ) of 21.79 mA/cm 2 , an open circuit photovoltage (V oc ) of 0.93 V and a fill factor (FF) of 63.3%. These results indicate a possible direction for preparing flexible perovskite solar cells.

γ-Fe2O3 as a novel Electron Transporting Material for Planar Heterojunction Perovskite Solar Cells by simple Room-Temperature Solution method