Low temperature ZnO/TiOx electron-transport layer processed from aqueous solution for highly efficient and stable planar perovskite solar cells

摘要： Owing to the low temperature processability and high charge carrier mobility, ZnO has been successfully employed in perovskite solar cells (PSCs) to act as the electron transport layer. Even so, because of the poor ZnO/perovskite interface chemical stability, achieving highly ef?cient and stable PSCs is still challenging the researchers. Therefore, the optimization of ZnO/perovskite interface by proper surface passivation has been developed for highly ef?cient PSCs. In this work, an environmentally friendly low-temperature aqueous solution-processed TiOx was applied on the aqueous solution-processed ZnO surface to promote the ZnO/perovskite interface stabilization and the interface charge recombination reduction. High performance PSCs with over 19% ef?ciency and relatively good stability were ?nally obtained. This low temperature aqueous solution-processed ZnO/TiOx route is simple and scalable, and facilities the future commercialization of perovskite based photovoltaic technology. Meanwhile, it is also compatible with the ?exible energy devices.