高温高压下掺杂N型PbTe的热电性能

 以Sb₂Te₃作为掺杂剂，利用高温高压技术，成功合成出N型PbTe。在常温下对其热电性能的测试结果表明：掺杂微量的Sb₂Te₃后，PbTe的赛贝克系数绝对值和电阻率大幅度下降，热导率随掺杂浓度的增加缓慢升高。掺杂后PbTe的品质因子先大幅度增加，后逐渐降低，最高达到8.7×10^-4 K^-1，它比常压合成的PbTe掺杂PbI₂高一倍以上。结果表明，将高温高压方法与掺杂相结合，能有效地改善PbTe的热电性能。

Thermoelectric Properties of N-PbTe Doped with Sb2Te3 Prepared by High-Pressure and High-Temperature

N-type PbTe compounds doped with Sb₂Te₃ have been prepared at high-pressure and high-temperature (HPHT). The thermoelectric properties of all the samples have been measured at room temperature. The Seebeck coefficients in absolute value and the electrical resistivities decrease with an increase of Sb₂Te₃ content dramatically first and then slowly. The thermal conductivity slight increases with an increase of the content of doping. The figure of merit, Z, increases first and then decreases and the maximum value reaches 8.7×10^-4 K^-1 which is much higher than that PbTe doped with PbI₂ prepared at normal pressure. This result indicates that enhanced thermoelectric properties of PbTe can be obtained by the HPHT method with suitable dopant.