The AgIn_(5)Se_(8) diamond-like compound with low thermal conductivity is deemed to be a promising thermoelectric material,but its performance is limited by its low electrical conductivity.Herein,we report an effectiv...The AgIn_(5)Se_(8) diamond-like compound with low thermal conductivity is deemed to be a promising thermoelectric material,but its performance is limited by its low electrical conductivity.Herein,we report an effective method to increase the maximum and average zT values of AgIn_(5)Se_(8)-based compounds by adding excess Ag.All the samples exhibit increased carrier concentrations of ~10^(18) cm^(-3) at ambient temperature,leading to considerably enhanced electrical conductivity.Meanwhile,the excess Ag creates numerous point defects,twin boundaries and stacking faults,which serve as the internal-strain field to induce additional phonon scattering and lattice softening to lower the lattice thermal conductivity.The synergistic strategy yields a peak zT value of 0.67 at 883 K and an average zT value of 0.34 from 323 to 883 K for Ag_(1.03)In_(5)Se_(8).展开更多
基金financially supported in part by the Fundamental Research Funds for the Central Universities 2018CDYJSY0055 and No.106112017CDJQJ308821)National Natural Science Foundation of China(Grant No.51772035,11674040,and 51472036)+3 种基金the Graduate Scientific Research and Innovation Foundation of Chongqing,China,Grant No.CYB 19064,the CSC scholarship(No.201806050180)2019 ITS Summer Fellowshipfinancially supported by the Key Research Program of Frontier Sciences,CAS,Grant No.QYZDB-SSW-SLH016the Project for Fundamental and Frontier Research in Chongqing(CSTC2015JCYJBX0026 and CSTC2017JCYJAX0388).
文摘The AgIn_(5)Se_(8) diamond-like compound with low thermal conductivity is deemed to be a promising thermoelectric material,but its performance is limited by its low electrical conductivity.Herein,we report an effective method to increase the maximum and average zT values of AgIn_(5)Se_(8)-based compounds by adding excess Ag.All the samples exhibit increased carrier concentrations of ~10^(18) cm^(-3) at ambient temperature,leading to considerably enhanced electrical conductivity.Meanwhile,the excess Ag creates numerous point defects,twin boundaries and stacking faults,which serve as the internal-strain field to induce additional phonon scattering and lattice softening to lower the lattice thermal conductivity.The synergistic strategy yields a peak zT value of 0.67 at 883 K and an average zT value of 0.34 from 323 to 883 K for Ag_(1.03)In_(5)Se_(8).
