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首页> 外文期刊>Advanced Functional Materials >High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band-Extrema Alignment
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High ZT 2D Thermoelectrics by Design: Strong Interlayer Vibration and Complete Band-Extrema Alignment

机译：通过设计高ZT 2D热电测量：强大的层间振动和完整带 - 极值对齐

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摘要

The discovery of a record high figure of merit (ZT) of approximate to 2.6 associated with bulk SnSe has stimulated considerable enthusiasm in searching for 2D systems with similar high ZT. However, previously reported 2D thermoelectric (TE) materials generally possess very low ZT due to the high lattice thermal conductivity (kappa(L)) and/or small power factor (PF). Herein, a very high ZT (approximate to 2.08) value associated with atomically thin 2D KAgSe nanosheet is reported, which also exhibits an unprecedented low intrinsic kappa(L) (approximate to 0.03 Wm(-1) K-1 at 700 K for trilayer) and fairly large PF. The low kappa(L) mainly stems from the high lattice anharmonicity induced by both the "interfacial shear slip" vibrations and the asymmetric "Ag-Se pair" vibrations from distorted AgSe4 tetrahedrons. Meanwhile, the complete band-extrema alignment and coexistence of heavy and light bands result in an optimal Seebeck coefficient and electrical conductivity, thereby a large PF. This work suggests not only an alternative way to acquiring high lattice anharmonicity but also a highly competitive 2D TE candidate for wide applications.
机译：发现与批量SNSE相关的2.6近似值的记录高峰（ZT）刺激了在具有相似高ZT的2D系统方面激发了相当大的热情。然而，先前报道的2D热电（TE）材料通常具有非常低的ZT由于高晶格导热率（κ（L））和/或小功率因数（PF）。在此，报告了与原子薄的2D kagse纳米片相关的非常高的Zt（近似为2.08）值，其也表现出前所未有的低固有κ（L）（近似为0.03wm（-1）k-1，在700k对于Trilayer ）和相当大的PF。低κ（L）主要源于“界面剪切滑动”振动和来自扭曲的Agse4四边体的“界面剪切滑动”振动和不对称的“Ag-Se对”振动引起的高晶格anhagity。同时，重和光带的完整带 - 极值对准和共存导致最佳的塞贝克系数和电导率，从而大的PF。这项工作不仅建议获得高格子anharmonicity的替代方法，而且是广泛应用的高竞争力的2D TE候选者。

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  • 来源
    《Advanced Functional Materials》 |2020年第22期|2001200.1-2001200.8|共8页
  • 作者

    Zhang Xiwen; Liu Chenhan; Tao Yi; Li Yunhai; Guo Yilv; Chen Yunfei; Zeng Xiao Cheng; Wang Jinlan;

  • 作者单位

    Southeast Univ Sch Phys Nanjing 211189 Peoples R China|Southeast Univ Sch Mech Engn Nanjing 211189 Peoples R China;

    Southeast Univ Sch Mech Engn Nanjing 211189 Peoples R China;

    Southeast Univ Sch Mech Engn Nanjing 211189 Peoples R China;

    Southeast Univ Sch Phys Nanjing 211189 Peoples R China;

    Southeast Univ Sch Phys Nanjing 211189 Peoples R China;

    Southeast Univ Sch Phys Nanjing 211189 Peoples R China|Southeast Univ Sch Mech Engn Nanjing 211189 Peoples R China;

    Univ Nebraska Lincoln Dept Chem Lincoln NE 68588 USA;

    Southeast Univ Sch Phys Nanjing 211189 Peoples R China|Southeast Univ Sch Mech Engn Nanjing 211189 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    2D thermoelectrics; band-extrema alignment; figure of merit; interlayer-related vibration;

    机译：2D热电;带 - 极值对齐;优点图;中间层相关振动;

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