Honeycomb-like puckered PbSe with wide bandgap as promising thermoelectric material: a first-principles prediction

材料科学 热电效应 带隙 蜂巢 蜂窝结构 工程物理 光电子学 纳米技术 物理 复合材料 热力学
作者
Shuwei Tang,Shulin Bai,Mengxiu Wu,Dongming Luo,Dongyang Wang,Shaobin Yang,Li‐Dong Zhao
出处
期刊:Materials Today Energy [Elsevier BV]
卷期号:23: 100914-100914 被引量:26
标识
DOI:10.1016/j.mtener.2021.100914
摘要

Motivated by the superior thermoelectric performance of two-dimensional (2D) materials, the thermoelectric properties of honeycomb-like puckered PbSe monolayer are theoretically evaluated using the first-principles calculation and the semiclassical Boltzmann transport theory. The computational results show that the puckered PbSe monolayer is an indirect semiconductor with a wide bandgap of 2.31 eV within Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional in combination with spin-orbital coupling (SOC) effect. The phonon dispersion spectrum and mechanical stabilities show that the PbSe monolayer is thermodynamically and mechanically stable without negative frequencies and elastic constants. The Seebeck coefficients corresponding to the maximum figure of merit ( ZT ) at 900 K are ∼ 234 and ∼ 280 μV/K along the armchair and zigzag directions, respectively, which are highly correlated to the special band structure and density of states of PbSe monolayer. Along the armchair and zigzag directions, strong anisotropy in the thermoelectric properties is discovered for the p -type PbSe monolayer. The maximum ZT for optimal p -type doping PbSe monolayer at 900 K approaches to ∼ 1.3 along the zigzag direction. Our present work would provide a deep insight into the thermoelectric transport in the low dimensional system and explore a new PbSe-based with wide bandgap thermoelectric material. • The honeycomb-liked puckered PbSe monolayer is an indirect semiconductor with wide bandgap. • The puckered PbSe monolayer possesses excellent electron transport properties and power factors. • The p -type PbSe monolayer can be used as potential material for thermoelectric applications.
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