CrS的热电特性2-Te (x:0,1,2) 二甲基化物单层:第一原理研究
Farva Tufail1,2, Abdull Farooq2, Altaf Ur Rahman2
1School of Integrated Circuit Science and Engineering, University of Electronic Sciences and Technology of China, Chengdu 610054, People's Republic of China.
ACS omega
|June 10, 2024
概括
本研究探讨了二二原化单层 (CrS2-xTex) 的热电特性. 这些发现揭示了通过兴奋剂和结构改造设计高效的热电材料的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算材料科学科学 计算材料科学
背景情况:
- 二维过渡金属二甲基化物 (TMDC) 对先进的电子和热电应用具有前景.
- 调整TMDC的组成,如CrS2-xTex,为优化其性能提供了一条途径.
- 了解载体依赖的热电行为对于材料设计至关重要.
研究的目的:
- 研究CrS2-xTex (x=0,1,2) 单层的结构,电子和热电性能.
- 分析电子和孔兴奋剂对热电性能的影响.
- 为了确定具有高热电效率潜力的稳定CrS2-xTex组合物.
主要方法:
- 第一原理计算与博尔兹曼运输理论相结合.
- 对结构性,语音性,弹性和电子性质进行系统分析.
- 在不同的兴奋剂度和温度下计算热电传输系数.
主要成果:
- 所有研究的CrS2-xTex单层都表现出结构和动态稳定性.
- CrS2和CrTe2单层是半导体,其直接带隙分别为1.01 eV和0.67 eV;Janus CrSTe的带隙为0.21 eV.
- 预测了低晶格导热率 (CrSTe和CrTe2在700 K时的Klat ≈1 W/mK) 和有希望的功率 (CrS2在500 K时的ZT高达0.09)
结论:
- 该CRS2-xTex材料系统显示了可调节的热电特性.
- 电子和孔兴奋剂显著影响热电性能.
- 这些发现为设计用于能源转换设备的新型热电材料提供了洞察力.
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