物理学进展

物理学进展 ›› 2024, Vol. 44 ›› Issue (6): 259-277.doi: 10.13725/j.cnki.pip.2024.06.001

所属专题： 2024年, 第44卷

• •    下一篇

BiCuXO (X = S、Se、Te) 晶体的电输运与热输运性质研究

田浩1，董松涛2，李伊驰1，吕洋洋1，周健1，陈延彬3，姚淑华1   

  1. 1. 南京大学现代工程与应用科学学院，固体微结构物理国家重点实验室，江苏省功能材料设计原理与应用技术重点实验室，南京
    210093; 2. 江苏科技大学材料科学与工程学院，镇江212100; 3. 南京大学物理学院，固体微结构物理国家重点实验室，南京210093;
  • 出版日期:2024-12-20 发布日期:2024-12-10
  • 基金资助:
    国家自然科学基金创新研究群体科学基金 (No.51721001)， 国家自然科学基金(No.52331008、 No.52272002、No.11974163、No.11890702) 和国家重 点研发计划(No.1406903) 的资助。

Investigation on the Electrical and Thermal Transport Properties of BiCuXO (X=S, Se, Te) Crystals

TIAN Hao1, DONG Song-tao2, LI Yi-chi1, LÜ Yang-yang1, ZHOU Jian1, CHEN Yan-bin3, YAO Shu-hua1   

  1. 1. College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing 10093; 2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100; 3. School of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 10093
  • Online:2024-12-20 Published:2024-12-10

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摘要：

BiCuXO (X = S、Se、Te) 作为层状氧化物，具有良好的电输运性能以及低的热导率，是 一种潜在的性能优异的热电材料。材料物理性能的优化离不开对晶体本征性能的研究。本文首先 详细介绍BiCuXO 晶体的生长工艺，通过生长方法和元素掺杂调节载流子浓度，改善其电输运性 质，并与文献报道的陶瓷样品进行了对比。其次介绍BiCuXO 晶体的电输运性能和热输运性能， 电输运性能主要包括导电行为、散射机制及磁阻演化；热输运性能主要是通过非弹性中子散射和 拉曼实验研究，并结合第一性原理计算研究其极低热导率的物理机制。最后介绍了基于热电效应 BiCuSeO 晶体在光热电领域的应用。本文总结了BiCuXO 晶体的生长方法，研究其电学、热学 以及光热电性能，希望为BiCuXO 性能的优化提供思路。

关键词: BiCuSeO, 晶体生长, 热电性能, 电输运, 热导率, 光热电效应

Abstract:

BiCuXO (X=S, Se, Te), a layered oxide material, has garnered significant attention due to its exceptional electrical transport properties and inherently low thermal conductivity, positioning it as a prospective candidate for high-performance thermoelectric applications. The optimization of material physical properties is intrinsically linked to an in-depth investigation of the crystallographic properties. This study initially presents a meticulous account of the growth procedures for BiCuXO crystals, elucidating the enhancement of electrical transport characteristics through the modulation of carrier concentrations via growth methodologies and elemental doping. A comparative analysis with ceramic samples documented in the literature is also provided. Subsequently, the paper delves into the electrical and thermal transport properties of BiCuXO crystals. The electrical transport properties encompass conductive behavior, scattering mechanisms, and magnetic resistance evolution. The thermal transport performance is mainly studied through inelastic neutron scattering and Raman experiments, combined with first principles calculations to investigate the physical mechanism of its extremely low thermal conductivity. The paper culminates with an exposition on the application of BiCuSeO crystals in photothermal electricity, harnessing the thermoelectric effect. By summarizing the growth methodologies of BiCuXO crystals and examining their electrical, thermal, and photothermal properties, this paper endeavors to offer theoretical insights and experimental guidance for the enhancement of BiCuXO material performance.

Key words: BiCuSeO, crystal growth, thermoelectric performance, electricity transportation, thermal conductivity, photothermoelectric effect

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