制备工艺对新型热电材料制冷性能的影响

Effect of Preparation Process on Properties of New Semiconductor Thermoelectric Materials

摘要:

通过取点法得到了由Ingot方法、BM方法、S-MS方法和Te-MS方法制备的四种新型P型热电材料(Bi0.5Sb1.5)Te3的变物性参数拟合公式，分析了温度对基于不同方法制备的热电材料的影响，得到了热电材料无量纲优值与绝对温度的关系曲线。此外，从热力学方面研究了不同制备工艺对热电材料组成的热电制冷器最大制冷系数的影响。结果表明：由Te-MS方法制备的新型P型热电材料(Bi0.5Sb1.5)Te3具有最大的优值系数，热电性能最优。基于Te-MS方法制备的新型P型热电材料(Bi0.5Sb1.5)Te3的热电制冷器具有最大的制冷系数，其达到2.49，较其他三种方法制备的热电材料分别提升了34.59%、37.57%、25.76%。

Abstract:

The fitting formulas of variable physical parameters of four new P-type thermoelectric materials (Bi0.5Sb1.5)Te3 prepared by Ingot method, BM method, S-MS method and Te-MS method were obtained by point method. The influence of temperature on thermoelectric materials prepared by different methods was analyzed. The relation curve between dimensionless merit figure and absolute temperature of thermoelectric materials is obtained. In addition, the influence of different preparation processes on the maximum coefficient of performance (COP) of thermoelectric cooler composed of thermoelectric materials was studied from the thermodynamic aspect. The results show that: Compared with the other three preparation methods, the new P-type thermoelectric material (Bi0.5Sb1.5)Te3 prepared by Te-MS method has the largest coefficient of merit and the best thermoelectric performance. The thermoelectric refrigerator with the new P-type thermoelectric material (Bi0.5Sb1.5)Te3 prepared by Te-MS method has the maximum COP, which can reach 2.49, which is 34.59 %, 37.57 % and 25.76 % higher than those prepared by the other three methods, respectively.