Fig. 2: The stabilizing mechanism of PEI/PDMEA buffer. | Nature Communications

Fig. 2: The stabilizing mechanism of PEI/PDMEA buffer.

From: Cross-linked multifunctional bilayer polymer buffer for enhanced efficiency and stability in perovskite solar cells

Fig. 2

a Schematic illustration of PSCs during high-vacuum thermal evaporation of electrode, shows surface damage of perovskite film in BCP based device and intact perovskite layer in PEI/PDMEA based device. b, c XPS results of N 1s and I 3d peaks of perovskite layer before and after high-vacuum thermal evaporation of electrode. d UV-vis spectra of perovskite film before and after high-vacuum thermal evaporation of electrode. e PL spectra of perovskite film before and after high-vacuum thermal evaporation of electrode. f Schematic illustration of complete solar cells after thermal aging, shows effective blocking of Ag and I diffusion in PEI/PDMEA based device. g, h Peeled Ag experiments were performed on BCP and PEI/PDMEA based devices after aging at 85 °C for 500 h in glove box, (g) SEM images of the Ag film bottom and (h) EDS mapping of the PCBM film top. i, j The in-depth profile of ToF-SIMS for aged (i) BCP based and (j) PEI/PDMEA based device.

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