Impact of electron transport layer uniformity on field-induced degradation of inverted perovskite solar cells

The impact of different electron transport layers (ETLs) based on fullerene derivatives, such as the well-known PC₆₁BM and promising 3-pyridyl-substituted pyrrolidino[60]fullerene (PYF-30), on the electric field-induced degradation of inverted perovskite solar cells has been demonstrated. Devices assembled using PYF-30 and PC₆₁BM deposited from deuterated chloroform exhibit significantly higher stability compared to PC₆₁BM films deposited from chlorobenzene. The main reason for the decrease in the efficiency of the device during aging is the formation of pinhole-type defects in the ETL caused by the agglomeration of molecules of fullerene derivatives.