In-situ boundary bridging unlocks multi-grain-domain carrier diffusion in polycrystalline metal halide perovskites.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41034199.
- Also identified by DOI 10.1038/s41467-025-63777-5 and PMC identifier 12488885.
- Licence recorded as CC BY-NC-ND.
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Abstract
Charge transport and extraction in polycrystalline perovskite films are often hindered by inefficient carrier transfer across grain domain boundaries (GDBs). Herein, we present a universal post-treatment strategy leveraging supramolecular crown ether-assisted slow release and precise delivery of Rb⁺ cations to GDBs, achieving in-situ GDB bridging. The solid-state nuclear magnetic resonance (NMR), transmission electron microscopic (TEM), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analyses confirm that Rb<sup>+</sup> forms a non-perovskite phase, primarily localized at the surface and GDBs. Ultrafast time-resolved photoluminescence mapping revealed accelerated carrier diffusion across the grain boundaries for the Rb<sup>+</sup>-treated perovskite thin films which enables photo-generated charge carriers to travels over two grain domain boundaries before recombination. As a result, perovskite solar cells treated with this strategy achieved a champion efficiency of 26.02% (certified as 25.77%) and demonstrated remarkable stability, retaining 99.2% of their initial efficiency after 1300 h of continuous one-sun illumination under maximum power point tracking (ISOS-L-1I).