Thermal Stable Perovskite Solar Cells Improved by ZnO/Graphene Oxide as Electron Transfer Layers

ZnO/graphene oxide (GO) nano-particles (NPs) layer was prepared using a facile solution process and employed as an electron conductor to improve the thermal stability of perovskite solar cells.Structural changes during the degradation process in high temperature environment were characterized via in situ grazing incidence X-ray diffraction.The optical properties and surface morphologies of the films were characterized.It was observed that smooth and compact structure of ZnO/GO layer works as a protection layer to prevent decomposition of perovskite film which is converted into PbI 2 during the annealing process reaction.The perovskite film grown on ZnO/GO layer exhibited enhanced crystallization, high surface coverage ratio as well as preferred in-plane orientation of the (110) plane.