Scholarlink

<p>The peak figure of merit (<i>ZT</i>) of GeTe-based thermoelectric (TE) materials is typically attained in the high-temperature cubic phase, where the inevitable phase transition raises concerns over interfacial instability during operation. Therefore, developing high-performance rhombohedral GeTe below the phase transition temperature represents a more viable path toward practical applications. Herein, we propose a facile nanocomposite strategy to enhance the TE performance of rhombohedral GeTe by incorporating high-modulus TiB<sub>2</sub> nanoparticles into Ge<sub>0.94</sub>Bi<sub>0.05</sub>Te matrix. We demonstrate that the nanoparticle-induced interfacial constraint effect contributes to increasing longitudinal elastic modulus and decreasing equivalent deformation potential, accounting for improved carrier mobility. Additionally, these TiB<sub>2</sub> inclusions form heterogeneous interfaces that promote charge depletion and generate substantial thermal resistance, concurrently suppressing the heat transfer by carriers and phonons. Consequently, an extraordinary <i>ZT</i> of 2.66 at 613 K and a superior average <i>ZT</i> of 1.29 (300 ~ 613 K) are obtained in the rhombohedral GeTe-based composite. This work shows a paradigm for synergistically optimizing the electrical and thermal transports of emerging TE systems with nanoinclusions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Giant ZT enhancement in rhombohedral GeTe-based thermoelectric materials

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月15日

查看全文
  • Jincheng Yu,
  • Xiaodong Liu,
  • Yilin Jiang,
  • Chen Chen,
  • Jing-Wei Li,
  • Haihua Hu,
  • Lin Song,
  • Tian Xie,
  • Bin-Bin Ruan,
  • Yu Pan,
  • Guoyu Wang,
  • B. Layla Mehdi,
  • Xiaoyuan Zhou,
  • Jing-Feng Li

摘要

The peak figure of merit (ZT) of GeTe-based thermoelectric (TE) materials is typically attained in the high-temperature cubic phase, where the inevitable phase transition raises concerns over interfacial instability during operation. Therefore, developing high-performance rhombohedral GeTe below the phase transition temperature represents a more viable path toward practical applications. Herein, we propose a facile nanocomposite strategy to enhance the TE performance of rhombohedral GeTe by incorporating high-modulus TiB2 nanoparticles into Ge0.94Bi0.05Te matrix. We demonstrate that the nanoparticle-induced interfacial constraint effect contributes to increasing longitudinal elastic modulus and decreasing equivalent deformation potential, accounting for improved carrier mobility. Additionally, these TiB2 inclusions form heterogeneous interfaces that promote charge depletion and generate substantial thermal resistance, concurrently suppressing the heat transfer by carriers and phonons. Consequently, an extraordinary ZT of 2.66 at 613 K and a superior average ZT of 1.29 (300 ~ 613 K) are obtained in the rhombohedral GeTe-based composite. This work shows a paradigm for synergistically optimizing the electrical and thermal transports of emerging TE systems with nanoinclusions.