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法、BM法、S-MS法和Te-MS法制备的四种新型p型热电材料(Bi0.5Sb1.5)Te₃的变物性参数拟合公式,分析了温度对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。从热力学方面研究了制备工艺对基于新型热电材料的热电制冷器最大制冷系数的影响。结果表明:由Te-MS法制备的新型p型热电材料(Bi0.5Sb1.5)Te₃具有最大的优值系数,基于该材料的热电制冷器最大制冷系数可达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%和25.76%。

Abstract:

The fitting formulas of variable physical parameters of four new p-type thermoelectric materials (Bi0.5Sb1.5)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 was 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 (Bi0.5Sb1.5)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 (Bi0.5Sb1.5)Te₃ prepared by Te-MS method has the maximum COP of 2.49, which is 34.59%, 37.57% and 25.76% higher than that prepared by other three methods, respectively.