we studied efficient and stable perovskite solar cells (PSCs) using PEDOT:PSS:graphene oxide(GO) composite layer as a hole transport layer. The enhanced performance of device with PEDOT:GO composite layer comes from good optical and electrical properties of the PEDOT:GO layer. Benzoid-quinoid transition of PEDOT:PSS and higher work function of PEDOT:PSS and GO composite layer enhances charge transport ability. Moreover, improved morphology of the perovskite layer suppresses leakage current. The device with the PEDOT:PSS and GO composite layer shows superior long-term stability in ambient air. The maximun value of PSCs shows power conversion efficiency of 18.09% which is higher value compared to the solar cell with PEDOT:PSS layer.