Realizing High Thermoelectric Performance in Sb-Doped Ag2Te Compounds with a Low-Temperature Monoclinic Structure

• DOI: 10.1021/acsami.0c10932
• Publication Date: 2020-08-06T21:02:28Z
• Authors: Ting Zhu; Hui Bai; Jian Zhang; Gangjian Tan; Yonggao Yan; Wei Liu; Xianli Su; Jinsong Wu; Qingjie Zhang; Xinfeng Tang
• Keywords: Monoclinic crystal system

To recover the low-grade waste heat (300-500 K), it is of urgent importance to develop and improve thermoelectric performance at a low-temperature region. Herein, we have realized record high ZT value 1.4 410 K average 0.6 in temperature interval from 300 400 for Sb-doped Ag2SbxTe1-x (x = 0-0.03) compounds, which show an improvement 180 120% compared pristine Ag2Te, respectively. Sb doping increases carrier concentration electrical conductivity, leading remarkable transport properties. The Ag2Sb0.015Te0.985 sample obtains maximal power factor 1.07 × 10-3 W m-1 K-2 K, increased by 80% comparison that Ag2Te. Moreover, as result intensified alloying phonon scattering doping, Ag2Sb0.01Te0.99 possesses minimum lattice thermal conductivity 0.35 K-1 demonstrates decline 57% All these produce great enhancement on Ag2Te materials, shows potential application recycling