非谐性
单层
声子
双层
堆积
凝聚态物理
热电材料
热电效应
材料科学
声子散射
热导率
物理
结晶学
化学
纳米技术
热力学
复合材料
有机化学
生物化学
膜
作者
Shuhua Bai,Mengxiu Wu,Jingyi Zhang,Dongming Luo,Da Wan,Xiaodong Li,Shuwei Tang
标识
DOI:10.1016/j.cej.2022.140832
摘要
Two-dimensional (2D) Sn-based Janus materials have attracted enormous attention on account of the inexpensive, earth-abundant, and eco-friendly merits. Whereas, few works give explicit analysis about the underlying mechanism of stacking pattern from monolayer (ML) to bilayer (BL) configuration on the thermoelectric properties of Sn-based Janus materials. In our present work, the elastic modulus, phonon dispersion and ab initio molecular dynamics (AIMD) simulations are performed, which firstly verifies the mechanical, dynamic and thermal stabilities of ML SnSSe and BL SnXY (X/Y = S, Se) materials. Notably, the lowest lattice thermal conductivity (κl∼1.85 W/m [email protected] K) is observed in BL SnSe2. Consequently, the optimal values of figure-of-merit (ZT) are observed for n-type (∼[email protected] K) or p-type (∼[email protected] K) BL SnSe2. Additionally, the optimal ZT can be improved from ML to BL configuration because of the weaker phonon transport caused by structure engineering, as evidenced by the maximal ZTs of n-type and p-type ML SnSSe (∼1.11 and ∼[email protected] K) and BL SeSnS/SSnSe (∼2.55 and ∼[email protected] K). Our present work not only provides deep insight into electronic and phonon transport properties in ML SnSSe and BL SnXY, but also paves the way for the theoretical investigation of high thermoelectric performance for Sn-based Janus materials.
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