All-inorganic inverse perovskite solar cells using zinc oxide nanocolloids on spin coated perovskite layer.

We confirmed the influence of ZnO nanoparticle size and residual water on performance of all inorganic perovskite solar cells. By decreasing the size of the ZnO nanoparticles, the short-circuit current density () and open circuit photovoltage () values are increased and the conversion efficiency is improved. Although the value is not affected by the influence of residual water in the solution for preparing the ZnO layer, the value drops greatly. As a result, it was found that it is important to use the oxide nanoparticles with a small particle diameter and to reduce the water content in the oxide forming material in order to manufacture a highly efficient all inorganic perovskite solar cells.