The emergent perovskite photovoltaics
technology faces challenges
like the long-term durability combining moisture, thermal, and photo
stresses that prevents them from competing with established technologies.
Here, we introduce a series of new fluorinated fullerenes as an electron-transporting
layer (ETL) for robust perovskite photovoltaics that deliver a high
power conversion efficiency of 21.27% with substantially improved
durability against environmental stressing. The hydrophobic nature
of the new fullerene protects the unencapsulated perovskite cell with
stability over 1400 h in 85% relative humidity. Notably, the unencapsulated
device maintained 80% of their original performance (T80) after being immersed in water for over 10 min. Detailed characterizations
suggest that the fluorinated fullerene can immobilize the cations
in perovskites and passivate the surface traps. Therefore, the T80 lifetime of the devices under constant illumination reached
1920 h. On the basis of the accelerated test, we estimate a lifetime
approaching 10 years with encapsulation. The successful demonstration
of the new ETL can stimulate further research and momentum for future
photovoltaic technology development.
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