New synergistic ion immobilization strategy in mixed tin-lead and all-perovskite tandem solar cells yields impressive results
Low-bandgap (LBG) mixed tin-lead (Sn−Pb) perovskite solar cells (PSCs) tend to suffer from inferior performance due to their high defect density. Conventionally, ethylenediammonium diiodide (EDADI) is used as a surface passivator to reduce defects and improve device photovoltaic performance, but it introduces severe hysteresis caused by excessive mobilized ions at the top interface.
Now, researchers from China's Soochow University and Sichuan University have reported a mobile ion suppressing strategy that uses hydrazine monohydrochloride (HM) as a bulk passivator to anchor the free ions in LBG perovskites.