First-principles design of MSi2N4/WSi2N4 (M = Ti, Zr, Hf): Structural stability, thermal, electronic and optical properties

First-principles design of MSi2N4/WSi2N4 (M = Ti, Zr, Hf): Structural stability, thermal, electronic and optical properties

The family of two-dimensional MA2Z4 heterostructures has received increasing attention in recent years. To investigate the structural stability, electrical structure, optical characteristics, and thermal properties (M = Ti, Zr, and Hf) of MSi2N4/WSi2N4, we have carried out first-principles calculati...

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Bibliographic Details
Main Authors: Guang Wang, Mengya Huang, Zhao Ding, Xiang Guo, Zhengli Zhang, Xuefei Liu, Yi Wang
Format: Article
Language:English
Published: Elsevier 2024-02-01
Series:Results in Physics
Subjects:
First-principles calculations
Electronic structure
Optical properties
Thermal performance
Online Access:http://www.sciencedirect.com/science/article/pii/S2211379724001098
Description
Summary:The family of two-dimensional MA2Z4 heterostructures has received increasing attention in recent years. To investigate the structural stability, electrical structure, optical characteristics, and thermal properties (M = Ti, Zr, and Hf) of MSi2N4/WSi2N4, we have carried out first-principles calculations. The dynamic stability of MSi2N4/WSi2N4 (M = Ti, Zr, and Hf) is confirmed by phonon spectrum analysis. ZrSi2N4/WSi2N4 and HfSi2N4/WSi2N4 have indirect band type with bandgap of 0.37 eV and 0.34 eV, respectively, while TiSi2N4/WSi2N4 exhibits metallic property. At room temperature (300 K), the relative thermal values (CV) of MSi2N4/WSi2N4 (M = Ti, Zr and Hf) vary between 100 and 212.5 JK-1mol−1. Moreover, ZrSi2N4/WSi2N4 and HfSi2N4/WSi2N4 have light absorption qualities below 12 % in both the Ultraviolet and Infrared areas. The MSi2N4/WSi2N4 materials (where M = Ti, Zr, and Hf) exhibit exceptional characteristics, positioning them as promising candidates for applications in thermoelectric and nanoelectronic fields.
ISSN:2211-3797

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