共振散射对热电性能的影响

为了用理论方法探索共振散射对热电性能的影响，在单抛物能带基础上，通过建立仅考虑声学声子散射和共振散射的载流子输运模型，模拟计算和对比分析有/无共振散射条件下的电导率、Seebeck系数、功率因子、洛仑兹常数和电子热传导等热电性能。结果表明:由于共振散射的引入，功率因子可提高到3.5倍，电子热导率将降低0.45倍，显示出对热电性能提升的重要意义；同时，共振能级的能量范围必须大于一定宽度，才能有效影响热电输运，且宽度越宽，对热电性能的提高越为有利。

Effects of the Resonant Scattering on Thermoelectric Properties

To explore the effects of resonant scattering on the thermoelectric properties theoretically, a carrier transport model based on single parabolic band considering only acoustic phonon scattering and resonant scattering is proposed. Using this model, many thermoelectric properties, including the electrical conductivity, theSeebeck coefficient, the power factor, the Lorenz number and the electrical thermal conductivity are calculated and compared to illustrate the effects of resonant scattering induced by resonant states. The results show that, because of the resonant scattering, the power factor would be enhanced up to 3.5 times, while the electrical thermal conductivity would be suppressed down to 0.45 times simultaneously. These demonstrate the important role on thermoelectric properties improving. The calculation also shows that, the carrier transport can only be effectively affected when the energy range of the resonant level is wide enough, and the wider the range is, the higher the thermoelectric properties would be.