LAUSR

Abstract As a promising electron transport layer (ETL) material, tin oxide (SnO2) has been widely used for high-quality perovskite solar cells (PSCs). To further raise power conversion efficiency (PCE) of the PSCs, it is critical to improve the performance of SnO2 film. Herein, a facile method is proposed to tailor the properties of SnO2 ETL by treating it with ethanol vapor during the annealing process. With such treatment, the conductivity and electron mobility of SnO2 film are improved. More impressively, the absorption intensity of the perovskite film deposited on the ethanol vapor-treated SnO2 (E: SO) shows an increase, and the defect states are also effectively passivated. Thus, the VOC and FF of the devices based on the E: SO are greatly improved. Finally, the device achieves a champion PCE of 17.66%, which is superior to the control device of 16.62%. The results demonstrate that ethanol vapor annealing treatment is an effective method for improving the performance of photovoltaic devices based on SnO2 ETL.