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High thermal energy storage of the two-dimensional Al2Te3 semiconductor: DFT study of stability, electronic, phonon, thermal, and optical properties based on GGA and HSE06.

Authors :
Abdullah, Nzar Rauf
Azeez, Yousif Hussein
Pirot, Bashdar Rahman
Gudmundsson, Vidar
Source :
Physics Letters A. Dec2024, Vol. 528, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

The present study investigates the structural, electronic, thermal, and optical properties of a novel two-dimensional Al 2 Te 3 using GGA and HSE06 functional in the framework of density functional theory. The formation energy, the phonon dispersion, and AIMD calculations confirm the structural, dynamical, and thermal stability of Al 2 Te 3 , respectively. The electronic band structure and partial density of states indicate the semiconducting characteristics of 2D Al 2 Te 3 with band gap values of 1.92 eV (GGA) and 2.78 eV (HSE06). The thermal properties of Al 2 Te 3 reveal a high heat capacity due to a very high phonon density of states. This property signifies the material's growing ability to store thermal energy. Thus the entropy demonstrates a continuous increase with temperature, adhering to the second law of thermodynamics. The analysis of optical properties of Al 2 Te 3 demonstrates strong light interaction in the ultraviolet, UV, region, and the optical band gap is found to be larger than the electronic band gap for both GGA and HSE06 functional due to indirect behavior of the band gap. Furthermore, the static dielectric function, refractive index, and optical conductivity are found to be smaller in the case of HSE06 compared to the GGA which may be due to reduced transition probability, and less screening effects including in the HSE06 functional. These findings offer valuable insights into the potential applications of Al 2 Te 3 in various fields, including thermal energy storage and optoelectronics. • High thermal energy storage of 2D Al2Te3. • AIMD and Phonon dispersion confirm thermal and dynamic stability of Al2Te3. • HSE06 confirm better results comparing to the GGA. • Optical transitions are seen in the ranging from far visible to UV regions. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03759601
Volume :
528
Database :
Academic Search Index
Journal :
Physics Letters A
Publication Type :
Academic Journal
Accession number :
181191184
Full Text :
https://doi.org/10.1016/j.physleta.2024.130052