EPFL researchers have achieved the highest yet reproducibility for perovskite solar cells combined with 21.1% efficiency at normal operating conditions, in a cesium-containing perovskite cell. By adding cesium, the EPFL scientists made the first ever triple-cation perovskite mixture (Cs/MA/FA).
The new films are more heat-stable and less affected by changing surrounding variables such as temperature, solvent vapors or the heating protocol used for the device. More importantly, they also show stabilized power-conversion efficiencies of 21.1% and outputs at 18% under operational conditions, even after 250 hours. The researchers regard this as "an absolute breakthrough' and state that these properties are crucial for commercializing perovskite photovoltaics, especially since reproducibility and stability are the main requirements for cost-effective large-scale manufacturing of perovskite solar cells.
