Figure 4
From: Self-healing perovskite solar cells based on copolymer-templated TiO2 electron transport layer
(a–f) Cross-sectional FE-SEM images of perovskite devices with different thicknesses of ETL including a configuration of FTO/TiO2 block layer/TiO2 layer/Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3 /CIS/Au. (g) Electron transfer and electron transport mechanisms in different thicknesses of ETL. (1) No ETL (e− (FTO) + h+(perovskite)), (2) ultra-thin ETL, (3) ideal thickness of ETL (best performance), (4) ultra-thick ETL, and (e− (ETL) + h+ (perovskite)).
