【摘 要】
：
As an eco-friendly thermoelectric material,SnTe has attracted extensive attention.In this study,we use a stepwise strategy to enhance the thermoelectric performance of SnTe.Firstly,AgCl is doped into SnTe to realize band convergence and enlarge the band g
【机 构】
：
State Key Laboratory of Heavy Oil Processing,College of New Energy and Materials,China University of
论文部分内容阅读
As an eco-friendly thermoelectric material,SnTe has attracted extensive attention.In this study,we use a stepwise strategy to enhance the thermoelectric performance of SnTe.Firstly,AgCl is doped into SnTe to realize band convergence and enlarge the band gap of AgCl-doped SnTe.AgCl-doping also induces dense point defects,strengthens the phonon scattering,and reduces the lattice thermal conductivity.Secondly,Sb is alloyed into AgCl-doped SnTe to further optimize the carrier concentration and simultaneously reduce the lattice thermal conductivity,leading to improved thermoelectric dimensionless figure of merit,ZT.Finally,(Sn0.81Sb0.19Te)0.93(AgCl)0.07 has approached the ZT value as high as～0.87 at 773 K,which is 272％higher than that of pristine SnTe.This study indicates that stepwise AgCl-doping and Sb-alloying can significantly improve thermoelectric performance of SnTe due to synergistic band engineering,carrier concentration optimization and defect engineering.
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