Cs<sub>2</sub>AgSbI<sub>6</sub> Nanocrystals: a New Air-Stable Iodide Double-Perovskite (Elpasolite) Semiconductor
Three-dimensional (3D) iodide double perovskites (elpasolites) are extremely rare due to inherent instability issues. Here, we report the discovery of an air-stable iodide elpasolite semiconductor in the form of nanocrystals with the composition Cs<sub>2</sub>AgSbI<sub>6</sub>, synthesized via halide exchange from Cs<sub>2</sub>AgSbBr<sub>6</sub> nanocrystals. This composition, previously considered thermodynamically unstable based on computational predictions, shows a ∼1.8 eV optical gap with near-infrared photoluminescence. The nanocrystals are stable in air up to at least 140 °C. As one of only a few known examples of intermediate-bandgap 3D iodide double perovskites, Cs<sub>2</sub>AgSbI<sub>6</sub> represents a promising platform for further development of this family of materials as well as for fundamental and optoelectronic investigations.
Authors
- Faris Horani (ORCID: https://orcid.org/0000-0001-8333-525X)
- Daniel R. Gamelin (ORCID: https://orcid.org/0000-0003-2888-9916)
Institutions
- University of Washington (US)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2025-05-01
- DOI
- https://doi.org/10.1021/jacs.5c03942
- Citations
- 9
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 6.57
Funders
- Washington Research Foundation
- ISEF Foundation
- Council for Higher Education
- Division of Materials Research