期刊
NANO LETTERS
卷 18, 期 2, 页码 1118-1123出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04659
关键词
Lead-free perovskites; colloidal semiconductor nanocrystals; anion exchange; elpasolites
类别
资金
- U.S. National Science Foundation [DMR-1505901, DMR-1408617]
- IC Postdoctoral Fellowship Program
- National Science Foundation [BCC-1542101]
- University of Washington
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- National Institutes of Health
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1505901] Funding Source: National Science Foundation
Concerns, about the toxicity and instability of lead-halide perovskites have driven a recent surge in research toward alternative lead-free perovskite materials, including lead-free double perovskites with the elpasolite structure and visible bandgaps. Synthetic approaches to this class of materials remain limited, however, and no examples of heterometallic elpasolites as nanomaterials have been reported. Here, we report the synthesis and characterization of colloidal nano crystals of Cs2AgBiX6 (X = Cl, Br) elpasolites using a hot injection approach. We further show that postsynthetic modification through anion exchange and cation extraction can be used to convert these nanocrystals to new materials including Cs2AgBiI6, which was previously unknown experimentally. Nanocrystals of Cs2AgBiI6, synthesized via a novel anion-exchange. protocol using trimethylsilyl iodide, have strong absorption throughout the visible region, confirming theoretical predictions that this material could be a promising photovoltaic absorber. The synthetic methodologies presented here are expected to be broadly generalizable. This work demonstrates that nanocrystal ion-exchange reactivity can be used to discover and develop new lead-free halide perovskite materials that may be difficult or impossible to access through direct synthesis.
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