A Redox-Active Ionic Liquid Surface Treatment for Healing CsPbBr<sub>3</sub> Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 39632705.
- Also identified by DOI 10.1021/acs.nanolett.4c04348 and PMC identifier 11660234.
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Abstract
Additive engineering of lead halide perovskites has been a successful strategy for reducing a variety of deleterious defect types. Ionic liquids (ILs) are a unique group of such additives that have been used to passivate halide vacancies in both bulk lead halide perovskites and their colloidal nanocrystal analogues. Herein, we expand the types of defects that can be addressed through IL treatments in CsPbBr<sub>3</sub> nanocrystals with a novel phosphonium tribromide IL that heals metallic lead surface defects through redox chemistry. This new type of surface treatment leads to a significant increase in PLQY and outperforms equivalent treatments with non-redox-active bromide ILs. Such redox-active ligands widen the scope of defect types that can be addressed in semiconductor nanocrystals.