Fig. 4: Role of the Y2O3 interlayer in inhibiting interfacial ion diffusion.
From: Yttrium oxide engineered substrate enables improved durability for perovskite solar cells
a–c Variation of F, O, and I content within the FTO/SnO2/perovskite configuration after 300 h of heating at 85 °C. d–f Variation of F, O, and I ion content within the FTO/Y2O3/SnO2/perovskite configuration under the same conditions. g Ion diffusion in the FTO/SnO2/perovskite configuration. h Ion diffusion in the FTO/Y2O3/SnO2/perovskite configuration.
