Thermal conductivity of biaxial-strained MoS2: sensitive strain dependence and size-dependent reduction rate
Thermal conductivity of biaxial-strained MoS2: sensitive strain dependence and size-dependent reduction rate
复制标题
双轴应变 MoS2 的热导率：敏感的应变依赖性和尺寸依赖性的减小率
DOI：
10.1088/0957-4484/26/46/465707
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发表时间：
2015
期刊：
影响因子：
3.5
通讯作者：
Yang Shengyuan A
中科院分区：
文献类型：
--
作者：
Zhu Liyan;Zhang Tingting;Sun Ziming;Li Jianhua;Chen Guibin;Yang Shengyuan A
结合第一性原理计算和Boltzmann输运方程研究了双向拉伸应变对MoS 2热输运性质的影响。发现单层MoS 2的热导率被施加的应变严重抑制;即使是中等的双轴拉伸应变，2 - 4%，也可能导致热导率降低10 - 20%。最有趣的是，热导率的降低率是尺寸依赖性的，这是由于在不同尺寸的MoS 2样品不同的主导声子散射机制。热传导率的敏感应变依赖性表明，应变工程可能是一种有效的方法，以提高的优点，用于热电应用的二硫化钼2。
The effect of biaxial tensile strain on the thermal transport properties of MoS 2 is investigated by combining first-principles calculations and the Boltzmann transport equation. The thermal conductivities of single layer MoS 2 are found to be heavily suppressed by the applied strains; even a moderate biaxial tensile strain, 2∼ 4%, could result in a 10∼ 20% reduction in the thermal conductivity. Most interestingly, the reduction rate of thermal conductivity is size-dependent, which is due to different dominant phonon scattering mechanisms at different sizes of MoS 2 samples. The sensitive strain dependence of thermal conductivity indicates that strain engineering could be an effective method to enhance the figure of merit for thermoelectric applications of MoS 2.