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<p>Inorganic plastic semiconductors play a crucial role in the realm of flexible electronics. In this study, we present a cost-effective plastic thermoelectric semimetal magnesium bismuthide (<i>α</i>-Mg<sub>3</sub>Bi<sub>2</sub>), exhibiting remarkable thermoelectric performance. Bulk single-crystalline <i>α</i>-Mg<sub>3</sub>Bi<sub>2</sub> exhibits considerable plastic deformation at room temperature, allowing for the fabrication of intricate shapes such as the letters “SUSTECH” and a flexible chain. Transmission electron microscopy, time-of-flight neutron diffraction, and chemical bonding theoretic analyses elucidate that the plasticity of <i>α</i>-Mg<sub>3</sub>Bi<sub>2</sub> stems from the helical dislocation-driven interlayer slip, small-sized Mg atoms induced weak interlayer Mg-Bi bonds, and low modulus of intralayer Mg<sub>2</sub>Bi<sub>2</sub><sup>2-</sup> networks. Moreover, we achieve a power factor value of up to 26.2 µW cm<sup>-1</sup> K<sup>-2</sup> along the c-axis at room temperature in an n-type <i>α</i>-Mg<sub>3</sub>Bi<sub>2</sub> crystal. Our out-of-plane flexible thermoelectric generator exhibit a normalized power density of 8.1 μW cm<sup>-2</sup> K<sup>-2</sup> with a temperature difference of 7.3 K. This high-performance plastic thermoelectric semimetal promises to advance the field of flexible and deformable electronics.</p>

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Helical dislocation-driven plasticity and flexible high-performance thermoelectric generator in α-Mg3Bi2 single crystals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月2日

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  • Mingyuan Hu,
  • Jianmin Yang,
  • Yan Wang,
  • Junchao Xia,
  • Quan Gan,
  • Shuhuan Yang,
  • Juping Xu,
  • Shulin Liu,
  • Wen Yin,
  • Baohai Jia,
  • Lin Xie,
  • Haifeng Li,
  • Jiaqing He

摘要

Inorganic plastic semiconductors play a crucial role in the realm of flexible electronics. In this study, we present a cost-effective plastic thermoelectric semimetal magnesium bismuthide (α-Mg3Bi2), exhibiting remarkable thermoelectric performance. Bulk single-crystalline α-Mg3Bi2 exhibits considerable plastic deformation at room temperature, allowing for the fabrication of intricate shapes such as the letters “SUSTECH” and a flexible chain. Transmission electron microscopy, time-of-flight neutron diffraction, and chemical bonding theoretic analyses elucidate that the plasticity of α-Mg3Bi2 stems from the helical dislocation-driven interlayer slip, small-sized Mg atoms induced weak interlayer Mg-Bi bonds, and low modulus of intralayer Mg2Bi22- networks. Moreover, we achieve a power factor value of up to 26.2 µW cm-1 K-2 along the c-axis at room temperature in an n-type α-Mg3Bi2 crystal. Our out-of-plane flexible thermoelectric generator exhibit a normalized power density of 8.1 μW cm-2 K-2 with a temperature difference of 7.3 K. This high-performance plastic thermoelectric semimetal promises to advance the field of flexible and deformable electronics.