在n型和p型CuAgSe中实现通过空位操纵实现平衡的高热电性能
Tian Yu1, Suiting Ning1, Qian Liu1
1Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University, Wuhan 430072, China.
ACS applied materials & interfaces
|August 17, 2023
概括
研究人员通过控制离子空位来调整铜银化物 (CuAgSe) 的热电特性. 这种方法实现了高性能n型和p型材料,对于热电设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 热电学是一种热电学.
背景情况:
- 铜银化物 (CuAgSe) 具有类似液体的特性,具有较高的载体流动性和较低的导热性.
- CuAgSe经历了温度依赖的n-p导电型转变,由于双载体导电,使热电性能优化复杂化.
研究的目的:
- 证明能够自由调整导电类型并提高CuAgSe的热电性能的能力.
- 调查离子空缺在控制CuAgSe.Se电子和热电特性中的作用.
主要方法:
- 通过调整 CuAg 含量和引入 Zn 兴奋剂来操纵阴离子空缺.
- 定子灭绝测量用于分析阴离子空位度.
- 热电性能的评估,包括功绩数字 (zT).
主要成果:
- 增加CuAg含量或Zn兴奋剂会抑制阴离子空缺,减少孔度,并使n型导电成为可能.
- 减少空缺削弱了载体散射,增强了载体的移动性,并提高了n型热电性能.
- 降低CuAg含量增加了离子空缺,导致高性能p型CuAgSe.
- 在600K时,n型 (Cu1.01Ag1.02Zn0.01Se) 的最大zT为0.84,p型 ((CuAg) 0.96Se) 的最大zT为1.05.
结论:
- 离子空置工程是控制导电类型和优化CuAgSe中的热电性能的一个有效策略.
- 该研究成功地产生了高性能n型和p型CuAgSe材料.
- 这些发现为开发基于CuAgSe.Se的先进热电材料提供了途径.
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