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. 2017 Jan 9;8:13938. doi: 10.1038/ncomms13938

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XRD spectrum of a perovskite cell based on AZO as EEL after storage in air for 7 days (inset: magnified view of the (100) PbI₂ reflection for a fresh sample and one that has been stored in air for 7 days; spectra were vertically offset for clarity) (a). Photoemission spectra of the iodine I3d_5/2 peak for fresh and aged cells based on AZO, SnO_x and bilayered AZO/SnO_x EELs, respectively (b). The aged samples were stored in air for 2 days. Corresponding plan-view SEM images of the 10 nm Ag layer in case of the AZO sample (c,d), and for the AZO/SnO_x sample (e). Schemes of ageing for the AZO and the AZO/SnO_x samples (f,g).