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The most challenging obstacles to practical application of perovskite solar cells (PSCs) are moisture sensitivity, and instability in ambient conditions. Recently, it has been seen that graphene or graphene based composites are the suitable candidate to improve the stability of PSCs. In present work, we reported the fabrication of lead halide PSCs by employing reduced graphene oxide (rGO) decorated spiro-MeOTAD as hole-transport material (rGO+HTM). Fabricated PSCs (ITO/SnO2/CH3NH3PbI3/rGO+HTM/Au) device exhibited good efficiency of 11.18% with excellent open circuit voltage (Voc) of 930 mV. Control device (ITO/SnO2/CH3NH3PbI3/HTM/Au) showed efficiency of 10.22% with Voc of 920 mV. Further, stability studies showed that presence of rGO improved the stability of developed PSCs and it retained more than 58.14% of its initial efficiency after 500 h. In case of control device, the efficiency was dropped from 10.22% to 4.4% (retained 43% efficiency after 500 h).
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