fig4

Figure 4. (A) N_ovs. time of PSC after exposure to 65 °C for 72 h with grey scatter points representing N_o measured from Ag top electrode and black scatter points representing N_o measured from C top electrode on the same substrate with in-situ and ex-situ measurements having circle and square shapes respectively. The C top electrode displays lower and more consistent N_o values when compared to Ag top electrode throughout the tested period. Inset - Device stack structure of PSC - ITO-Glass/NiO_x/MAPbI₃/C₆₀/Ag or C, both the electrodes are deposited on the same substrate. (B) I-V response vs. time of the PSC when measured from the Ag top electrode showing degradation with aging. (C) I-V response vs. time of the PSC when measured from the C top electrode showing good current response throughout the tested period.