Double-layered ZnO nanostructures for efficient perovskite solar cells

摘要

To date, a single layer of TiO2 or ZnO has been the most successful implementations of any electron transport layer (ETU in solution-processed perovskite solar cells. In a quest to improve the ETL, we explore a hew nanostructured double-layer ZnO film for meso-scopic perovskite-based thin film photovoltaics. This approach yields a maximum power conversion efficiency of 10.35%, which we attribute to the morphology of oxide layer and to faster electron transport. The successful implementation of the low-temperature hydrothermally processed double-layer ZnO film as ETL in perovskite solar cells highlights the opportunities to further improve the efficiencies by focusing on the ETL in this rapidly developing field.