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首页> 外文期刊>ACS nano >Fabricating CsPbX3-Based Type I and Type II Heterostructures by Tuning the Halide Composition of Janus CsPbX3/ZrO2 Nanocrystals
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Fabricating CsPbX3-Based Type I and Type II Heterostructures by Tuning the Halide Composition of Janus CsPbX3/ZrO2 Nanocrystals

机译：通过调节Janus Cspbx3 / ZrO2纳米晶体的卤化物组成来制造基于CspBx3的I型和II型异质结构

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摘要

Fabricating CsPbX3-based heterostructures has proven to be a feasible way to tune their photophysical properties. Here, we report the successful fabrication of Janus CsPbX3/ZrO2 heterostructure nanocrystals (NCs), in which each CsPbX3 NC is partially covered by ZrO2. According to the band alignment, CsPbBr3/ZrO2 and CsPbI3/ZrO2 can be indexed as type I and type II composites, respectively. The type I composites display great enhancement in photoluminescence quantum yield (from 63 to 90%) and photoluminescence lifetime (from 12.9 to 66.1 ns) because of the charge carrier confinement and passivation effect provided by ZrO2. In contrast, the type II composites can be used in photocatalytic reduction of CO2 because electrons and holes are effectively separated and accumulated in ZrO2 and CsPbI3, respectively, under irradiation. Janus CsPbBr3/ZrO2 NCs showed a stability much higher than that of pristine CsPbBr3 against polar solvent treatment. A stable and highly efficient light-emitting device with luminous efficiency up to 55 lm W-1 is fabricated by using CsPbBr3/ZrO2 NCs as the green light source. This work may not only enrich the family of surface-passivated perovskite materials but also provide a good example for the rational design of specific composites in the metal halide perovskite field.
机译：制造基于CSPBX3的异质结构已被证明是一种可行的方法来调谐它们的光物理性质。在此，我们报告了Janus Cspbx3 / ZrO2异质结构纳米晶体（NCS）的成功制造，其中每个CSPBX3 NC被ZrO2部分覆盖。根据带对准，CSPBBR3 / ZrO2和CSPBI3 / ZrO2分别可以分别索引为I型和II型复合材料。由于ZrO2提供的电荷载体限制和钝化效果，I型复合材料显示出光致发光量子产率（从63〜90％）和光致发光寿命（从12.9至66.1ns）的增强。相反，II型复合材料可用于CO 2的光催化还原，因为电子和孔分别在辐照下分别在Zro2和CSPBI3中有效地分离和累积。 Janus CSPBBR3 / ZrO2 NCS表现出远高于原始CSPBBR3对极性溶剂处理的稳定性。通过使用CSPBBR3 / ZRO2 NCS作为绿光源，制造具有明亮效率的稳定且高效的发光器件，可通过CSPBBR3 / ZrO2 NC制造。这项工作不仅可以丰富表面钝化的钙钛矿材料，还提供了金属卤化物钙钛矿场中特定复合材料的合理设计的一个很好的例子。

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  • 来源
    《ACS nano》 |2019年第5期|共9页
  • 作者

    Liu Haiyu; Tan Yeshu; Cao Muhan; Hu Huicheng; Wu Linzhong; Yu Xiaoya; Wang Lu; Sun Baoquan; Zhang Qiao;

  • 作者单位

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

    Soochow Univ Inst Funct Nano &

    Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat &

    Devices 199 Renai Rd Suzhou 215123 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分子物理学、原子物理学;
  • 关键词

    CsPbX3 nanocrystals; ZrO2; type I composite; type II composite; LED;

    机译：CSPBX3纳米晶体;ZrO2;I型复合材料;II型复合材料;LED;

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