Improving electrical and thermal properties synchronously via introducing CsPbBr_(3)QDs into higher manganese silicides  

作　　者：Qing Wang Zhiliang Li Xiaofeng Yang Xin Qian Linjuan Guo Jianglong Wang Dan Zhang Shu-Fang Wang 

机构地区：[1]Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province,College of Physics Science and Technology,Hebei University,Baoding 071002,China [2]Hebei Key Lab of Optic-Electronic Information and Materials,College of Physics Science and Technology,Hebei University,Baoding 071002,China

出　　处：《Journal of Materials Science & Technology》2022年第16期279-286,共8页材料科学技术（英文版）

基　　金：financially supported by the National Science Foundation for Young Scientists of China(No.51802071);the Advanced Talent Incubation Program of Hebei University(No.521000981162);the Outstanding Youth Science Foundation project of Hebei Province(No.A2020201032);the Local Science and Technology Development Fund Projects Guided by the Central Government(Nos.206Z4403G and 042000520091);the National Natural Science Foundation of China(No.51372064);the Hebei Province High-level Talents Funding project(No.A201801003);supported in part by the Microanalysis Center and the High-Performance Computing Center of Hebei University。

摘　　要：Higher manganese silicide(HMS)is a P-type medium temperature thermoelectric(TE)material,which has attracted widespread attention over the past few decades due to its remarkable mechanical properties,excellent chemical and thermal stability,as well as the non-toxicity,abundance and competitive price.The peak power factor(PF)of HMS is as high as~1.50×10^(-3)W m^(-1)K^(-2)because of its intrinsic high electrical conductivity and Seebeck coefficient.However,the thermal conductivity of HMS is also high,resulting in relatively low z T values.Introducing nano-dispersion in the matrix is one of the most effective methods to enhance the TE properties via reducing the lattice thermal conductivity significantly without drastic changes on the other parameters.In this study,Cs Pb BrQDs with uniform size were synthesized and introduced into HMS bulks.The PF(at 823 K)was enhanced to 1.71×10^(-3)W m^(-1)K^(-2),which is improved 14.0%approximately compared with that of pure HMS owing to the combined effect of element doping and energy filtering.The lattice thermal conductivity(at 823 K)decreased from 2.56W mKto 1.99 W mKsynchronously(~22.0%)due to the intensive phonon scattering caused by Cs doping,and the embedding of Pb riched CsPbBr_(3)QDs and Pb QDs.A maximum z T value of 0.57(823 K)is achieved in Cs Pb BrQDs/HMS composites,which is 36.0%higher than that of pure HMS.Predictably,for other TE materials,it is also feasible to improve the TE properties via introducing metastable quantum dots.

关 键 词：Thermoelectric material Higher manganese silicide Quantum dot Figure of merit INCLUSION 

分 类 号：TB34[一般工业技术—材料科学与工程]