In-Plane Anisotropic Thermal Conductivity of Low-Symmetry PdSe2
In-Plane Anisotropic Thermal Conductivity of Low-Symmetry PdSe2
复制标题
低对称性 PdSe2 的面内各向异性导热系数
DOI：
10.3390/su13084155
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发表时间：
2021-04-01
期刊：
影响因子：
3.9
通讯作者：
Li, Liang
中科院分区：
文献类型：
--
作者：
Chen, Lijie;Zhang, Weitao;Li, Liang
低对称二维（2D）材料在光学、电子学和力学中表现出新的各向异性。这些特性为纳米电子器件的基础研究开辟了新的途径。平面内热导率对器件的电子性能起着举足轻重的作用。本文系统地研究了具有五边形低对称结构的PdSe2的面内各向异性导热系数。用微拉曼测温方法测得面内各向异性比高达1.42。在拉曼散射光谱中，我们提取了对温度最敏感的Ag3模式的频移。通过分析悬浮PdSe2薄膜的热扩散方程，推导了其各向异性导热系数。随着厚度的增加，各向异性比逐渐减小，因为x方向的导热系数比y方向的导热系数增加得更快。各向异性热导率为下一代基于PdSe2的纳米电子器件提供了热管理策略。
Low-symmetry two-dimensional (2D) materials have exhibited novel anisotropic properties in optics, electronics, and mechanics. Such characteristics have opened up new avenues for fundamental research on nano-electronic devices. In-plane thermal conductivity plays a pivotal role in the electronic performance of devices. This article reports a systematic study of the in-plane anisotropic thermal conductivity of PdSe2 with a pentagonal, low-symmetry structure. An in-plane anisotropic ratio up to 1.42 was observed by the micro-Raman thermometry method. In the Raman scattering spectrum, we extracted a frequency shift from the Ag3 mode with the most sensitivity to temperature. The anisotropic thermal conductivity was deduced by analyzing the heat diffusion equations of suspended PdSe2 films. With the increase in thickness, the anisotropy ratio decreased gradually because the thermal conductivity in the x-direction increased faster than in the y-direction. The anisotropic thermal conductivity provides thermal management strategies for the next generation of nano-electronic devices based on PdSe2.