Stable photovoltaic cells based on graphene oxide/indium zinc oxide bilayer anode buffer

► Cell performances of OPV's with IZO/GO, GO/IZO, IZO, and PEDOT:PSS were compared. ► All layers are coated from solution process. ► We have developed stable OPV with GO/IZO anode buffer. ► Power conversion efficiency drops only 2.81% after 5 h continuous illumination.