Enhanced stability of MAPbI3 based perovskite solar cells

• Perovskite solar cells with device structure of FTO/TiO 2 /MAPbI 3 /GO+spiro-MeOTAD/Au has been developed. • GO+spiro-MeOTAD has been used as HTM. • PCE of 8.3% has been achieved using GO+spiro-MeOTAD as HTM. • The insertion of GO enhanced the stability of the perovskite solar cells. Herein, we reported the fabrication of perovskite solar cells (PSCs) with device architecture of FTO/TiO 2 /MAPbI 3 /GO+spiro-MeOTAD/Au. Graphene oxide (GO) was synthesized by Hummer’s method which was further incorporated with spiro-MeOTAD to develop the stable PSCs. The fabricated PSCs device exhibited good efficiency of 8.3% using GO+spiro-MeOTAD/Au as hole-transport material (HTM) whereas control device (without GO) showed efficiency of 6.95%. PSCs device (with GO+spiro-MeOTAD) also exhibited good stability up to 168 h under controlled humidity (∼40-50%).