摘要
热电材料是绿色能源转化、温差电技术应用的关键材料。由于各性能指标相互抑制,材料热电性能改善遇到瓶颈。材料微结构设计协同调控热电性能为下一代热电材料发展提供了一条明确思路。本文介绍热电材料"多尺度微结构构筑"、"电子晶体离子液体"、"晶格缺陷工程"等改善热电性能的新概念,从原子、纳米、微米等尺度分析能带调控、弱键合、非简谐振动效应、纳米畴散射机制、调幅分解、能量过滤机制、相变现象等物理、化学过程对热电输运行为的影响;阐述了热电材料晶体微结构特征,总结了点缺陷、晶界、纳米畴等结构参量对能带结构、载流子自由程、晶格振动模式等物理参量的影响规律;展望了下一代高性能块体热电材料的发展方向。
Thermoelectric material is a kind of key materials for green energy conversion and thermoelectric technology application, which encounters bottleneck due to mutual restriction among thermoelectric properties. It provides a clear idea for the next generation of thermoelectric materials that the material designs about microstructure collaboratively adjust thermoelectric properties. The new concepts improving the thermoelectric properties were introduced in this paper, such as ＂multi-scale hierarchical architecture＂, ＂electronic crystals and ionic liquid＂, and ＂lattice defect engineering＂. The effects of some physical and chemical process（such as energy band adjusting, weak bond, non harmonic vibration, nano-domain scattering, spinal decomposition, energy filtering mechanism and phase transformation） on thermoelectric transport behavior were described. The influences of microstructure parameters（such as point defect, grain boundary, nano domain and second phase） on physical parameters including band structure, carrier free path, lattice vibration mode, etc were discussed. Finally, the research hotspots of the high performance bulk thermoelectric materials were forecast on the basis of current status.
作者
刘洪权
楚志颖
崔洪芝
袁婷
谷亦杰
袁存辉
薛浩
王岩强
Liu Hongquan, Chu Zhiying, Cui Hongzhi, Yuan Ting, Gu Yijie, Yuan Cunhui, Xue Hao, Wang Yanqiang(Shandong University of Science and Technology, Qingdao 266590, Chin)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第3期1013-1019,共7页
Rare Metal Materials and Engineering
基金
山东省泰山学者计划(TS20110828)
山东省自然科学基金(ZR2015EM013)
山东省高等学校科技计划项目(YA07)
关键词
热电材料
晶体微结构
热电输运行为
thermoelectric materials
crystal microstructure
thermoelectric transport behavior
