期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 29, 页码 11435-11439出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b06055
关键词
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资金
- Gordon and Betty Moore Foundation [GBMF-4412]
- U.S. Department of Energy, Division of Basic Energy Sciences [DE-SC0019331]
- U.S. Department of Energy (DOE) [DE-SC0019331] Funding Source: U.S. Department of Energy (DOE)
We use a solid-state method to synthesize single crystals of perovskite-phase cesium lead iodide (gamma-CsPbI3) that are kinetically stable at room temperature. Single crystal X-ray diffraction characterization shows the compound is orthorhombic with the GdFeO3 structure at room temperature. Unlike conventional semiconductors, the optical absorption and joint density-of-states of bulk gamma-CsPbI3 is greatest near the band edge and decreases beyond the E-g for at least 1.9 eV. Bulk gamma-CsPbI3 does not show an excitonic resonance and has an optical band gap of 1.63(3) eV, similar to 90 meV smaller than has been reported in thin films; these and other differences indicate that previously measured thin film gamma-CsPbI3 shows signatures of quantum confinement. By flowing gases in situ during powder X-ray diffraction measurements, we confirm that gamma-CsPbI3 is stable to oxygen but rapidly and catalytically converts to non-perovskite delta-CsPbI3 in the presence of moisture. Our results provide vital parameters for theoretical and experimental investigations into perovskite-phase CsPbI3 that will the guide the design and synthesis of atmospherically stable inorganic halide perovskites.
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