Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi_2Te_3
Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi_2Te_3
复制标题
水热合成n型Se的增强热电性能
DOI：
10.1007/s40145-020-0382-9
复制
发表时间：
2020
影响因子：
16.9
通讯作者：
Jiang Wan
中科院分区：
文献类型：
--
作者：
Shi Xiaolei;Ai Xin;Zhang Qihao;Lu Xiaofang;Gu Shijia;Su Li;Wang Lianjun;Jiang Wan
采用水热法制备了N型Se、Lu共掺杂Bi2Te3纳米粉体，并采用放电等离子烧结技术对粉体进行了烧结。通过进一步向掺Lu的Bi2Te3样品中掺杂Se元素，纳米片的厚度有变薄的趋势。随着Se含量的增加，Lu0.1Bi1.9Te3− xSex材料的电导率由于载流子浓度的降低而降低，同时Seeback系数值增加。Lu0.1Bi1.9Te3− xSex的晶格热导率由于引入的点缺陷和原子质量波动而大大降低。最后，Lu0.1Bi1.9Te2.7Se0.3样品在420 K时获得最大ZT值0.85。该研究为低成本、低温制备高热电性能的Se、Lu共掺Bi2Te3提供了一种简单可行的方法。
N-type Se&Lu-codoped Bi2Te3nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense samples. By further doping Se element into Lu-doped Bi2Te3samples, the thickness of the nanosheets has the tendency to become thinner. The electrical conductivity of Lu0.1Bi1.9Te3−xSexmaterial is reduced with the increasing Se content due to the reduced carrier concentration, while the Seeback coefficient values are enhanced. The lattice thermal conductivity of the Lu0.1Bi1.9Te3−xSexis greatly reduced due to the introduced point defects and atomic mass fluctuation. Finally, the Lu0.1Bi1.9Te2.7Se0.3sample obtained a maximumZTvalue of 0.85 at 420 K. This study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3with high thermoelectric performance for practical applications.