A lead oxysalt coating has been developed that stabilizes perovskite surfaces against degradation and enhances the long-term performance of organic-inorganic perovskite solar cells. Many classes of perovskite solar cells show promise to be cheaper and more efficient than traditional silicon-based solar cells; however, perovskite solar cells suffer from various surface defects that rapidly degrade performance. Previous techniques have shown passivation of specific types of defects, but have not provided a catch-all improvement. The lead oxysalt coatings present a method to passivate a wide variety of surface defects through strong chemical bonds, and they especially prevent moisture from degrading the surface.
· Passivation based on direct chemical bonding to film surface
· Increased charge carrier lifetimes leading to >20% conversion efficiency
· Devices maintained 97% of initial efficiency under extended working conditions
- Stabilizing halide perovskite surfaces for solar cell operation with wide-bandgap lead oxysalts Science 365, 473-478 (2019)