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优化Sn-doped Sb2Te3合金中的热电效率,通过调节载体和声子运输来调节Se合金

Gyujin Chang¹, Chanwoo Ju¹, GwanHyeong Lee¹

¹Department of Materials Science and Engineering, University of Seoul, Seoul 02504, South Korea.

The Journal of chemical physics

|October 20, 2025

概括

和的双合金增强了反化的热电性能. 这种策略优化了中温应用的热导电性和热电功率 (zT).

科学领域:

材料科学材料科学材料科学
固态物理固态物理
能源科学能源科学

背景情况:

基于基化物 (Sb2Te3) 的合金对中温热电应用具有前景.
优化热电传输特性对于高效的能量转换至关重要.

研究的目的:

研究 (Sn) 和 (Se) 合金对Sb2Te3.3的热电性质的联合作用.
通过操纵载体度和导热率来增强热电功率 (zT).

主要方法:

系统的合成和原始Sb2Te3和Sn-Se合金Sb2Te3 (Sn0.03Sb1.97Te3-ySey) 的表征.
测量热电传输特性,包括载体度,有效质量和热导率.
分析缺陷结构及其对热电性能的影响.

主要成果:

在Sb2Te3中1.5%的Sn兴奋剂增加了有效质量,并降低了晶格导热率,将zT提高到0.58.
斯诺也增加了载体度,限制了进一步的zT增强.
Se合金降低了载体度和总导热率,导致Sn0.03Sb1.97Te3-0.10Se0.10.10在650K时的最大zT为0.67,Sn0.03Sb1.97Te3-0.10Se0.10.

结论:

用Sn和Se进行双重兴奋剂是一种有效的策略,可以提高Sb2Te3.3的热电性能.
通过降低载体度和声子散射,Se合金显著降低了导热率.
优化的Sn-Se联合合金Sb2Te3在中温应用中表现出卓越的热电特性.

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