Anisotropic properties of two-dimensional (2D) tin dihalide (SnX2, X = Cl, Br, I) monolayer binary materials

This paper investigated the electronic properties and photoresponse of two-dimensional SnX (X = Cl, Br, I) monolayer binary materials using computational techniques. The calculated band structure and density of states indicate that these are large band gap semiconducting materials with an indirect b...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2024-03, Vol.36 (11), p.115701
Main Authors: Kumar, Vipin, Jeon, Hwajun, Kumar, Pushpendra, Trung, Le Gia, Ahuja, Rajeev, Gwag, Jin Seog
Format: Article
Language:English
Subjects:
2D materials
anisotropic properties
density functional theory
dielectric properties
optical properties
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Summary:This paper investigated the electronic properties and photoresponse of two-dimensional SnX (X = Cl, Br, I) monolayer binary materials using computational techniques. The calculated band structure and density of states indicate that these are large band gap semiconducting materials with an indirect band gap. The studied chemical bonding mechanism shows the existence of the hybrid bonding of ionic and covalent bonds in these dihalide materials. The valence band (VB) and conduction band (CB) edge positions are also estimated, using the concept of electronegativity and band gap, to investigate the photocatalytic activity of SnX . Next, we investigated the polarization and energy-dependent dielectric and optical functions along the crystallographic axes of these materials in the linear response approach of the perturbing incident oscillating light field. These materials exhibit an anisotropic behavior of these functions, especially in the high-energy visible and low-energy ultraviolet (UV) regions. The absorption of incident light photons is very fast in SnI than SnBr and SnCl in the low-energy UV region. It demonstrates the higher absorption coefficient and optical conductivity in Snl . The obtained average static refractive index of SnCl is comparable to that of glass (1.5), showing its application as transparent material. The low reflection coefficient, less than 20%, makes them superior for antireflection coating materials in the infrared and visible regions. The prominent energy loss peaks show the existence of plasmon resonances in these materials. The most of losses occur in the UV region. The investigated electronic and photoresponse properties indicate that these Sn-based dihalide materials are excellent for electronic devices and optoelectronic applications. Also, the calculated VB and CB edge positions with respect to the normal hydrogen electrode show the favorable water-splitting capability of these materials.
ISSN:0953-8984
1361-648X
1361-648X
DOI:10.1088/1361-648X/ad1138