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Lead-free and stable antimony–silver-halide double perovskite (CH3NH3)2AgSbI6

机译:无铅且稳定的锑-卤化银双钙钛矿(CH 3 NH 3 2 AgSbI 6

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A mixed metal organic–inorganic perovskite (CH3NH3)2AgSbI6 was developed in which pairs of the Pb(II) atoms in traditional CH3NH3PbI3 perovskite are replaced by Sb(III)/Ag(I) aliovalent units. We used density functional theory (DFT) calculations (the GLLB-SC method) with spin–orbit coupling corrections to predict the optical band gap of the most stable MA2AgSbI6 structure (2.00 eV). The results suggest that it is a promising light absorber. We then synthesized the double perovskite MA2AgSbI6 and confirmed its structure using X-ray diffraction (XRD). The optical band gap (1.93 eV) is in good agreement with the DFT calculations. The band positions of the material (vs. vacuum) are provided for future uses such as achieving the precise energy level alignments for potential photovoltaic applications. This perovskite material exhibits excellent stability in ambient air.
机译:混合金属有机-无机钙钛矿(CH 3 NH 3 2 AgSbI 6 的开发中,传统CH 中的Pb( II )原子对3 NH 3 PbI 3 钙钛矿被Sb( III )/ Ag( I )等效单位。我们使用密度泛函理论(DFT)计算(GLLB-SC方法)和自旋-轨道耦合校正来预测最稳定的MA 2 AgSbI <的光学带隙small> 6 结构(2.00 eV)。结果表明,它是一种有前途的光吸收剂。然后合成了双钙钛矿MA 2 AgSbI 6 ,并用X射线衍射(XRD)证实了其结构。 。光学带隙(1.93 eV)与DFT计算非常吻合。提供材料的能带位置( vs。真空)以供将来使用,例如为潜在的光伏应用实现精确的能级对准。这种钙钛矿材料在环境空气中显示出极好的稳定性。

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