Fig. 4.

a Schematic layer stacking of carbon-based, all-inorganic CsPbIBr₂ PSC, b typical J–V curves of the PSCs employed CsPbIBr₂ films prepared with different concentrations of PEAI solutions, c statistic PCEs and d V_oc distributions of 20 independent PSCs based on CsPbIBr₂ films without and with interfacial voids, e J–V curves, f EQE spectra, and g steady-state photocurrent outputs of the champion PSCs based on CsPbIBr₂ films without and with interfacial voids. Time-dependent variations of PCEs of the un-encapsulated PSC based on CsPbIBr₂ film with interfacial voids in h glovebox atmosphere and i ambient condition