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a) J–V curves of the best devices with MASnI3 films prepared by current ion exchange/insertion method and the one‐step solution method, respectively. b) IPCE spectrum for the device via ion exchange/insertion method. c) Histograms of PCEs for 30 devices via ion exchange/insertion method. d) PCE evolution of unencapsulated PSCs in continuous operation under 1‐sun illumination at 25 °C in N2 atmosphere.
