Figure 1

(a) Device architecture and images of encapsulated perovskite solar cells. (b) Colour of encapsulated MAPbI₃ perovskite film observed before and after continuous heating at 85 °C and 85% relative humidity (RH). (c) Transmittance spectra of encapsulated MAPbI₃ films before and after heating at 85 °C and 85% RH for 1000 h.