Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 42, Pages 38648-38653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b11980
Keywords
halide double perovskite; lead-free; Cs2NaVCl6; visible-light absorbing semiconductor; direct band gap
Funding
- Natural Science Foundation of Shaanxi Province [2016JM2006]
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Developing environmentally friendly, stable, and narrow and direct band gap halide perovskite materials has attracted substantial interest because of their wide range of potential applications. Here, an all-inorganic Pb-free halide double perovskite, Cs2NaVCl6, was prepared by the solid-state reaction method and hydrothermal method. Cs2NaVCl6 crystallizes in the cubic Fm (3) over barm space group with the unit parameter a = 10.3497(14) angstrom. The combined density functional theory and experimental study demonstrates that the compound is a direct band gap semiconductor with a band gap of, similar to 2.64 eV. More importantly, it exhibits strong visible and near-infrared light absorptions and markedly ambient and thermal stability.
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