A Different, Nondestructive Method of Investigating In Situ Degradation in Hybrid Perovskite Solar Cells

Figure 3

(a) Measured (full line) and optically modelled (dotted line) reflection spectra of a complete solar cell. (b) Picture of unencapsulated MAPI solar cell before and after ageing. (c) Schematic illustrating the subdivision of the active layer. (d) Variation of PbI₂ as a fraction of the MAPI across the active layer depth as the solar cell ages.

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