单层
杰纳斯
材料科学
凝聚态物理
半导体
极限抗拉强度
密度泛函理论
模数
拉伤
石墨烯
纳米技术
化学
光电子学
计算化学
复合材料
物理
医学
内科学
作者
Xinlan Ge,Xueqing Zhou,Dongmei Sun,Xiaoshuang Chen
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-02-03
卷期号:8 (6): 5715-5721
被引量:1
标识
DOI:10.1021/acsomega.2c07271
摘要
In this work, the structural parameters and electronic properties of PtX2 and Janus PtXY (X, Y = S, Se, and Te) are studied based on the density functional theory. The phonon spectra and the Born criteria of the elastic constant of these six monolayers confirm their stability. All PtX2 and Janus PtXY monolayers show an outstanding stretchability with Young’s modulus ranging from 61.023 to 82.124 N/m, about one-fifth that of graphene and half that of MoS2, suggesting highly flexible materials. Our first-principles calculations reveal that the pristine PtX2 and their Janus counterparts are indirect semiconductors with their band gap ranging from 0.760 to 1.810 eV at the Perdew–Burke–Ernzerhof level (1.128–2.580 eV at the Heyd–Scuseria–Ernzerhof level). By applying biaxial compressive and tensile strain, the electronic properties of all PtX2 and Janus PtXY monolayers are widely tunable. Under small compressive strain, PtX2 and Janus PtXY structures remain indirect semiconductors. PtTe2, PtSeTe, and PtSTe monolayers undergo a semiconducting to metallic transition when the strain reaches −6, −8, and −10%, respectively. Interestingly, there is a transition from the indirect semiconductor to a quasi-direct one for all PtX2 and Janus PtXY monolayers when the tensile strain is applied.
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