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a) Normalized PCE of PSCs fabricated with and without SWCNTs in the TiO2 NF photoelectrodes as a function of long‐term storage time. The unencapsulated cells were kept in the dark in ambient conditions at a relative humidity of at least 60%. b) Normalized PCE of the devices with and without SWCNTs in the TiO2 NF photoelectrodes as a function of time exposed to continuous light illumination (100 mW cm−2, xenon lamp) for 144 min.
