1
|
Mehta D, Naik Y, Modi N, Parmar PR, Thakor PB. Optoelectronic and photocatalytic behaviour of a type-II GaAlS 2/HfS 2heterostructure: ab initiostudy. NANOTECHNOLOGY 2024; 35:315703. [PMID: 38670075 DOI: 10.1088/1361-6528/ad43f3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 04/26/2024] [Indexed: 04/28/2024]
Abstract
Theoretical examination based on first principle computation has been conducted for van der Waals heterostructure (vdwHS) GaAlS2/HfS2including structural, optoelectronic and photocatalytic characteristics. From the adhesion energy calculation, the AB configuration of GaAlS2/HfS2vdwHS is the most stable. A type-II GaAlS2/HfS2vdwHS is a dynamically and thermally stable structure. The band edge position, projected band, and projected charge densities verify the type-II alignment of GaAlS2/HfS2vdwHS. For GaAlS2/HfS2, GaAlS2is acting as a donor and HfS2is acting as an acceptor ensured by the charge density difference plot. The electron localized function validates the weak van der Waals interaction between GaAlS2and HfS2. The GaAlS2/HfS2vdwHS possess an indirect bandgap of 1.54 eV with notable absorption in the visible range. The findings assure that the GaAlS2/HfS2vdwHS is an efficient photocatalyst for pH 4-8. The band alignment of GaAlS2/HfS2is suitable for Z-scheme charge transfer. The strain influenced band edge suggests that the GaAlS2/HfS2vdwHS remains photocatalytic for strain-4%to+6%in both cases of uniaxial and biaxial strains.
Collapse
Affiliation(s)
- Disha Mehta
- Department of Physics, Veer Narmad South Gujarat University, Surat, Gujarat, 395007, India
| | - Yashasvi Naik
- Department of Physics, Veer Narmad South Gujarat University, Surat, Gujarat, 395007, India
| | - Nidhi Modi
- Department of Physics, Sir P. T. Sarvajanik College of Science, Surat, Gujarat, 395001, India
| | - P R Parmar
- Department of Physics, Veer Narmad South Gujarat University, Surat, Gujarat, 395007, India
| | - P B Thakor
- Department of Physics, Veer Narmad South Gujarat University, Surat, Gujarat, 395007, India
| |
Collapse
|
2
|
Munib Ul Hassan Noor Ul Taqi M, Pinsook U. Superconductivity in monolayer Janus titanium-sulfur hydride (TiSH) at ambient pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:325702. [PMID: 38684163 DOI: 10.1088/1361-648x/ad44fd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
Janus two dimensional (2D) materials are new and novel materials. As they break out-of-plane symmetry, they possess several fascinating properties which can be applied in catalytic reactions and opto-electronics. Recent synthesis of MoSH and the prediction of phonon-mediated superconductivity have opened a new way to investigate the properties of hydrogenated Janus materials (Novoselovet al2004Science306666-9; Mehtaet al2023Solid State Commun.375115347; Naiket al2023Comput. Theor. Chem.1228114278). In this work, we performed the density functional theory calculations to demonstrate that titanium sulfur hydride (TiSH) is dynamically stable and becomes phonon-mediated superconductor with the superconducting critical temperature,Tc= 9.24 K with the corresponding value of electron-phonon coupling constant,λ= 0.71, in the weak interaction limits, under ambient conditions. Eliashberg spectral functionα2F(ω)was well converged for dense grid ofq1 ×q2 ×q3 = 12 × 12 × 1 andnk1 ×nk2 ×nk3 = 140 × 140 × 1. The effect of smearing broadening was also considered for determining well converged value ofTcandλ. Figure5(b) shows that after smearing broadening of 0.02 Ry,λshows convergent values, and subsequent changes are as low as less that 5% of the peak value. Overall, our findings predicted a new member in the 2D Janus hydride family with possible applications in 2D nanomaterials and superconducting devices applications.
Collapse
Affiliation(s)
| | - Udomsilp Pinsook
- Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| |
Collapse
|
3
|
Zeng Q, Xu L, Xiong SX, Zhang Y, Cao L, Tao J, Li Z, Wang LL, Dong K. Two-Dimensional Sc 2CCl 2/XSe 2(X=Mo, Pt) van der Waals Heterojunctions: Promising Photocatalytic Hydrogen Evolution Materials. Chemphyschem 2024:e202400304. [PMID: 38622796 DOI: 10.1002/cphc.202400304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 04/10/2024] [Accepted: 04/15/2024] [Indexed: 04/17/2024]
Abstract
In the field of photocatalysis, new heterojunction materials are increasingly explored to achieve efficient energy conversion and environmental catalysis under visible light and sunlight. This paper presents a study on two newly constructed two-dimensional van der Waals heterojunctions, Sc2CCl2/MoSe2 and Sc2CCl2/PtSe2, using density-functional theory. The study includes a systematic investigation of their geometrical structure, electronic properties, and optical properties. The results indicate that both heterojunctions are thermodynamically, kinetically, and mechanically stable. Additionally, Bader charge analysis reveals that both heterojunctions exhibit typical type II band properties. However, the band gap of the Sc2CCl2/MoSe2 heterojunction is only 1.18 eV, which is insufficient to completely cross the reduction and oxidation (REDOX) potential of 1.23 eV, whereas the band gap of Sc2CCl2/PtSe2 heterojunction is 1.49 eV, which is theoretically capable for water decomposition. The subsequent calculation of the Sc2CCl2/PtSe2 heterojunction demonstrate excellent hole carrier mobility and high efficiency light absorption in the visible light range, facilitating the separation of photogenerated electrons and holes. More importantly, Sc2CCl2/PtSe2 vdW type II heterojunction can achieve full water decomposition from pH 1 to pH 4, and its thermodynamic feasibility is confirmed by Gibbs free energy results. The aim of this study is to develop materials and analyses that will result in optoelectronic devices that are more efficient, stable, and sustainable.
Collapse
Affiliation(s)
- Qionghui Zeng
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Liang Xu
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - S X Xiong
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Ying Zhang
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Lei Cao
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Ji Tao
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Zhengquan Li
- Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang, 330013, Jiangxi Province, P.R. China
| | - Ling-Ling Wang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Kejun Dong
- Centre for Infrastructure Engineering, School of Engineering, Design and Built Environment, Western Sydney University, Penrith, NSW-2751, Australia
| |
Collapse
|
4
|
Khengar SJ, Parmar PR, Modi N, Thakor PB. A study of 2D GeI 2/InTe van der Waals hetero bilayer as a photocatalyst material. NANOTECHNOLOGY 2023; 35:115704. [PMID: 38081073 DOI: 10.1088/1361-6528/ad143c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/10/2023] [Indexed: 12/28/2023]
Abstract
The computational study of the van der Waals hetero (vdW) bilayer GeI2/InTe has been carried out in present study. The isolated monolayer GeI2and InTe have been studied first and the results were compared to the previous studies. The possible stackings are considered after the vdW interaction correction is applied in the structure relaxation. The vdW hetero bilayer stability has been checked from the phonon dispersion andab initioMolecular Dynamics calculations. The charge transfer from InTe to GeI2monolayer. Type-II indirect band gap (1.98, 2.01 eV) is verified by the projected band structure and band alignment calculations. The vdW hetero bilayer is a superior photocatalyst for the pH value up to pH = 0 to 11. The optical properties are calculated from the complex dielectric constant. The absorption coefficient shows the enhance absorption of light in the visible and ultraviolet regions. The vdW hetero bilayer has shown low reflectivity (37%) and a high refractive index (2.80) in the visible region. The enhanced optical properties have shown its possible applications in optoelectronic devices.
Collapse
Affiliation(s)
- S J Khengar
- Department of Physics, Veer Narmad South Gujarat University, Surat-395007, Gujarat, India
| | - P R Parmar
- Department of Physics, Veer Narmad South Gujarat University, Surat-395007, Gujarat, India
| | - Nidhi Modi
- Department of Physics, Sir P. T. Sarvajanik Collage of Science, Surat 395001, Gujarat, India
| | - P B Thakor
- Department of Physics, Veer Narmad South Gujarat University, Surat-395007, Gujarat, India
| |
Collapse
|