Synergistic immobilization of ions in mixed tin-lead and all-perovskite tandem solar cells.

ABSTRACT: Low-bandgap (LBG) mixed tin-lead (Sn-Pb) perovskite solar cells (PSCs) 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. Here, we report a mobile ion suppressing strategy of using hydrazine monohydrochloride (HM) as a bulk passivator to anchor the free ions in LBG perovskites. The protonated hydrazine (N₂H₅⁺) of HM formed hydrogen bonds with iodine (I^-) ions, while the chloride (Cl^-) ions occupied the I^- vacancies, collectively impeding the migration of I^- and t

SUBMITTER: Liu Y 

PROVIDER: S-EPMC11992112 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature