Zn掺杂提升AgSnSbSe3热电性能的研究

Study on enhanced thermoelectric properties of Zn-doped AgSnSbSe3

通过高温熔炼的方法制备掺Zn的Ag Sn Sb Se3,分析了Ag Sn Sb Se3掺Zn后得到的Ag Sn Sb1-xZnxSe3(x=0.01,0.02,0.03,0.04)的相组成、形貌、元素组成和热电性能的关系,并利用COMSOL Multiphysic仿真模拟了热电优值(ZT值)最高的Ag Sn Sb0.98Zn0.02Se3的发电性能.研究表明:所有样品均为高对称的岩盐Na Cl结构,Zn掺杂可在样品中形成纳米第二相,一定量的Zn掺杂可协同优化Ag Sn Sb Se3的电声输运性能,样品Ag Sn Sb0.98Zn0.02Se3获得最高热电优值0.86@823 K.当温差为460 K时,获得的最大发电功率为11.372 m W,发电效率为5%,对Ag Sn Sb Se3掺杂外来原子可提升其热电性能.

Samples of Zn-doped AgSnSbSe3 were prepared by a high temperature melting method.The phase compositions,morphologies,chemical compositions and thermoelectric properties of AgSnSb1-xZnxSe3(x=0.01,0.02,0.03,0.04)were studied.The commercial finite-element software COMSOL Multiphysics was utilized to simulate the power output of AgSnSb0.98Zn0.02Se3 with highest ZT.Research results show that all samples exhibit high symmetry rock-salt NaCl structure and the doped Zn forms nanoscale second phase.A certain amount of Zn doping can synergistically optimize the electron and phonon transport properties of AgSnSbSe3,and the sample of AgSnSb0.98Zn0.02Se3 obtains the highest ZT of 0.86@823 K.The maximum output power is 11.372 mW at a temperature difference of 460 K,and the best efficiency is 5%.This works shows that doping foreign atoms into AgSnSbSe3 can effectively improve its thermoelectric properties.