Strain-induced rubidium incorporation into wide-bandgap perovskites reduces photovoltage loss.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40179180.
- Also identified by DOI 10.1126/science.adt3417.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
A-site cation mixing can enhance the photovoltaic performance of a wide-bandgap (WBG) perovskite, but rubidium (Rb) cation mixing generally forms a nonperovskite phase. We report that lattice strain locks Rb ions into the α-phase of the lattice of a triple-halide WBG perovskite, preventing phase segregation into a nonperovskite Rb-cesium-rich phase. This process cooperates with chloride accommodation and promotes halide homogenization across the entire film volume. The resulting 1.67-electron volt WBG perovskite exhibits photoluminescence quantum yields exceeding 14% under 1-sun-equivalent irradiation, corresponding to a quasi-Fermi level splitting of ~1.34 electron volts. A WBG perovskite solar cell with an open-circuit voltage (<i>V</i><sub>OC</sub>) of 1.30 volts was prepared, corresponding to 93.5% of the radiative <i>V</i><sub>OC</sub> limit and representing the lowest photovoltage loss relative to the theoretical limit observed in WBG perovskites.