Synergistic immobilization of ions in mixed tin-lead and all-perovskite tandem solar cells.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40216812.
- Also identified by DOI 10.1038/s41467-025-58810-6 and PMC identifier 11992112.
- Licence recorded as CC BY-NC-ND.
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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 (N<sub>2</sub>H<sub>5</sub><sup>+</sup>) of HM formed hydrogen bonds with iodine (I<sup>-</sup>) ions, while the chloride (Cl<sup>-</sup>) ions occupied the I<sup>-</sup> vacancies, collectively impeding the migration of I<sup>-</sup> and thus mitigating the ion movement-induced hysteresis that arose from EDADI usage. The synergistic strategy of HM doping and EDADI post-treatment significantly suppresses the oxidation of Sn<sup>2+</sup>, decreases trap density, and inhibits rapid crystallization of perovskite. Consequently, we achieved a champion efficiency of 23.21% for LBG PSCs. Integrating these cells with wide-bandgap PSCs into all-perovskite tandem solar cells yields a high efficiency of 28.55% (certified 28.31%) with negligible hysteresis.