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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 海洋能源利用与节能教育部重点实验室副主任
性别：男
毕业院校：静冈大学
学位：博士
所在单位：能源与动力学院
学科：工程热物理. 能源与环境工程
电子邮箱：dwtang@dlut.edu.cn
Effects of tensile strain and finite size on thermal conductivity in monolayer WSe2
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论文类型：期刊论文
发表时间：2019-01-07
发表刊物：PHYSICAL CHEMISTRY CHEMICAL PHYSICS
收录刊物：SCIE
卷号：21
期号：1
页面范围：468-477
ISSN号：1463-9076
摘要：In this paper, first-principles calculations along with the phonon Boltzmann transport equation are used to study the strain- and size-dependent thermal conductivity of monolayer WSe2. The thermal conductivity of monolayer WSe2 is primarily contributed by the acoustic phonons and decreases with tensile strain due to the reduction in both the group velocity and phonon lifetime. Shrinking the system size also restricts the thermal conductivity significantly by ruling out the contributions of long mean free path phonons. The rate of decrease in thermal conductivity with tensile strain is found to be size dependent, which is attributed to the competition between the phonon-phonon scattering and the phonon-boundary scattering. The decreasing trend of the thermal conductivity of monolayer WSe2 through tensile strain paves the way for high-efficiency thermoelectric materials combining the strain-tuned electronic structure.