在类似液体的固体溶液中逐步合,以实现调节热电传输行为的晶体学扭曲
Lin Bo1, Wenying Wang1, Junliang Zhu1
1School of Materials Science and Engineering, University of Jinan, Jinan 250022, China.
ACS applied materials & interfaces
|November 16, 2023
概括
研究人员使用逐步合金策略增强了化铜 (Cu2-Se) 热电材料. 这种方法改善了声子散射和脱的电荷载体,显著提高了热电性能,功率 (zT) 的峰值为1.23.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 能源转换 能源转换
背景情况:
- 不断增长的能源需求需要高效的热电材料来回收废热.
- 铜化物 (Cu2-Se) 是有希望的,但需要优化以提高热电效率.
- 控制声子传输对于提高热电性能至关重要.
研究的目的:
- 为了提高Cu2-Se.的热电功率 (zT) 的数字.
- 研究多层结构和合金对声子散射的影响.
- 在Cu2-Se.中将电荷载体和声子传输脱.
主要方法:
- 在Cu2-Se中通过与 (SnSe)0.75(AgBiSe2)0.25合金而构建多层结构.
- 使用逐步合金策略来增强晶体学扭曲和应变场.
- 精确调整Ag,Bi和Sn元素的合含量.
主要成果:
- 逐步合金显著加强了晶体学扭曲和应变场,增强了所有波长的声子散射.
- 在p型Cu2-Se.中,合金化有效地解了载体和声子运输.
- 在750K时达到1.23的最大热电功率 (zT) 在Cu1.9Se - 1重% (SnSe)0.75(AgBiSe2)0.25.
结论:
- 逐步合金是一种优化Cu2-Se.热电性能的有效策略.
- 开发的材料显示了有效的废热回收应用的潜力.
- 进一步的研究可以探索合金组成和结构的变化,以获得更高的效率.
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