用DFT计算晶体缺陷对单层WSe2 (P63/mmc)热电材料晶格导热系数的影响

IF 3.3 3区 物理与天体物理 Q2 PHYSICS, CONDENSED MATTER
Yingtao Wang, Xian Zhang
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引用次数: 2

摘要

在过去的几十年里,随着能源问题的日益突出,对热电材料的研究不断深入。低导热系数使热电材料具有更好的热转换性能。在本研究中,我们基于第一性原理和声子玻尔兹曼输运方程,利用密度泛函理论(DFT)研究了几种缺陷条件下单层WSe2的热导率。300 K时,WSe2在PS、SS-c、DS-s、SW-c、SS-e和DS-d 6种缺陷状态下的晶格热导率分别为66.1、41.2、39.4、8.8、42.1和38.4 W/(m·K)。与完美结构相比,缺陷结构可降低导热系数达86.7% (SW-c)。研究了缺陷含量、缺陷类型、缺陷位置等因素对材料热性能的影响。通过引入原子缺陷,我们可以降低和调节WSe2的热性能,这应该为其他热电材料获得更低的导热系数提供一个有趣的想法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the role of crystal defects on the lattice thermal conductivity of monolayer WSe2 (P63/mmc) thermoelectric materials by DFT calculation

As the energy problem becomes more prominent, research on thermoelectric (TE) materials has deepened over the past few decades. Low thermal conductivity enables thermoelectric materials better thermal conversion performance. In this study, based on the first principles and phonon Boltzmann transport equation, we studied the thermal conductivities of single-layer WSe2 under several defect conditions using density functional theory (DFT) as implemented in the Vienna Ab-initio Simulation Package (VASP). The lattice thermal conductivities of WSe2 under six kinds of defect states, i.e., PS, SS-c, DS-s, SW-c, SS-e, and DS-d, are 66.1, 41.2, 39.4, 8.8, 42.1, and 38.4 W/(m·K), respectively at 300 K. Defect structures can reduce thermal conductivity up to 86.7% (SW-c) compared with perfect structure. The influences of defect content, type, location factors on thermal properties have been discussed in this research. By introducing atom defects, we can reduce and regulate the thermal property of WSe2, which should provide an interesting idea for other thermoelectric materials to gain a lower thermal conductivity.

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来源期刊
Superlattices and Microstructures
Superlattices and Microstructures 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.20%
发文量
35
审稿时长
2.8 months
期刊介绍: Micro and Nanostructures is a journal disseminating the science and technology of micro-structures and nano-structures in materials and their devices, including individual and collective use of semiconductors, metals and insulators for the exploitation of their unique properties. The journal hosts papers dealing with fundamental and applied experimental research as well as theoretical studies. Fields of interest, including emerging ones, cover: • Novel micro and nanostructures • Nanomaterials (nanowires, nanodots, 2D materials ) and devices • Synthetic heterostructures • Plasmonics • Micro and nano-defects in materials (semiconductor, metal and insulators) • Surfaces and interfaces of thin films In addition to Research Papers, the journal aims at publishing Topical Reviews providing insights into rapidly evolving or more mature fields. Written by leading researchers in their respective fields, those articles are commissioned by the Editorial Board. Formerly known as Superlattices and Microstructures, with a 2021 IF of 3.22 and 2021 CiteScore of 5.4
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