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<p>Developing a strategy to enhance the thermoelectric performance of ionic semiconductors is challenging because of the pronounced electron localization inherent to the bonding nature. Herein, we demonstrate a bond manipulation approach in ionic-bonded compound MnTe achieved by the introduction of diverse atomic species, which effectively delocalizes electrons and modifies phase composition, leading to a comprehensive optimization in thermoelectric performance. As a result, we realize a peak <i>zT</i> value of ~1.6 at 773 K and an average <i>zT</i> value of ~0.9 from 300 K to 773 K. In addition, this chemical bonding engineering induces bond softening and forms multiscale hierarchical structures, resulting in a significant reduction in lattice thermal conductivity. Consequently, the segmented module fabricated from this p-type MnTe-based material achieves a thermoelectric conversion efficiency of 11% at a temperature difference ∆<i>T</i> = 473 K. Our findings establish bond engineering as an effective paradigm for enhancing the thermoelectric performance of ionic compounds.</p>

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Chemical bonding manipulation unlocks high performance ionic-bonded thermoelectrics

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月25日

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  • Haiqi Li,
  • Shuang Lyu,
  • Xiaofang Li,
  • Yuanhang Xia,
  • Kejia Liu,
  • Yuxin Sun,
  • Minglong Wang,
  • Jinxuan Cheng,
  • Wenxuan Wang,
  • Dongyi Shen,
  • Huajian Wu,
  • Chen Chen,
  • Qian Zhang,
  • Yue Chen

摘要

Developing a strategy to enhance the thermoelectric performance of ionic semiconductors is challenging because of the pronounced electron localization inherent to the bonding nature. Herein, we demonstrate a bond manipulation approach in ionic-bonded compound MnTe achieved by the introduction of diverse atomic species, which effectively delocalizes electrons and modifies phase composition, leading to a comprehensive optimization in thermoelectric performance. As a result, we realize a peak zT value of ~1.6 at 773 K and an average zT value of ~0.9 from 300 K to 773 K. In addition, this chemical bonding engineering induces bond softening and forms multiscale hierarchical structures, resulting in a significant reduction in lattice thermal conductivity. Consequently, the segmented module fabricated from this p-type MnTe-based material achieves a thermoelectric conversion efficiency of 11% at a temperature difference ∆T = 473 K. Our findings establish bond engineering as an effective paradigm for enhancing the thermoelectric performance of ionic compounds.