Data for: Improving electron extraction ability and suppressing recombination of planar perovskite solar cells with the triple cascade electron transporting layer

Experimental details. Schematically structures of the PSCs based on single-layered ETLs. J-V characteristics of cell with TiO2/ PCBM ETL and TiO2 ETL. J-V characteristics of cell with SnO2/ PCBM ETL and SnO2 ETL. Statistics of PCE distribution. The tables for the device performance.