摘要
单晶SnSe是一种具有优异热电性能的新型中温热电材料,但是具有更广阔应用前景的多晶SnSe热电性能较低。采用水热法结合放电等离子烧结技术制备了p型SnSe多晶块体热电材料,利用XRD、FE-SEM、ZEM-3热电测试系统等研究了不同退火温度对SnSe多晶材料物相组成、微观结构和热电性能的影响。结果表明,合适的退火温度可以通过促进晶粒生长,减少晶格缺陷来调整载流子浓度和迁移率,提高材料的电导率,从而获得功率因子的显著提升。经过600℃退火处理后,SnSe多晶材料的电导率在773 K时最大值为3.83μW/(cm·K 2),但其热导率几乎保持不变,与未退火样品相比ZT值(773 K)从0.56提高到0.63。
Single crystal SnSe is one of the new middle-temperature thermoelectric material with excellent thermoelectric properties,but the thermoelectric performance of polycrystalline SnSe which has widen application prospect is still much low.The polycrystalline SnSe bulk materials were prepared by hydrothermal method and spark plasma sintering technique.The effects of annealing temperature on the phase,microstructure and thermoelectric properties of polycrystalline SnSe were investigated by XRD,FE-SEM and ZEM-3 thermoelectric performance measurement.The results show that appropriate annealing temperature can improve the carrier concentration and mobility by promoting grain growth and reducing lattice defects,thus improve the electrical conductivity and achieve a significant increase in power factor.The peak electrical conductivity of polycrystalline SnSe annealed at 600℃is 3.83μW/(cm·K 2)at 773 K.At the same time,benefiting from the low thermal conductivity after annealing,the ZT value is enhanced from 0.56 to 0.63 at 773 K.
作者
李培
范胜杰
王连军
江莞
LI Pei;FAN Sheng-jie;WANG Lian-jun;JIANG Wan(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Glasses Manufacturing Technology,Ministry of Education,Donghua University,Shanghai 201620,China;Institute of Functional Materials,Donghua University,Shanghai 201620,China)
出处
《人工晶体学报》
EI
CAS
北大核心
2019年第10期1927-1932,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(51374078)
关键词
SnSe
热电性能
水热合成
退火
SnSe
thermoelectric property
hydrothermal synthesis
annealing
