{"title":"用于光伏应用的四方单斜碲化镉的结构和光电特性的 DFT 研究","authors":"Mounaim Bencheikh, Larbi El Farh, Allal Challioui","doi":"10.1007/s11051-024-06043-x","DOIUrl":null,"url":null,"abstract":"<p>In this paper, we examine the application of density functional theory (DFT) to determine the structural and optoelectronic properties of the tetragonal monochalcogenide TlSe, in order to assess its suitability for use in optoelectronic devices, photovoltaics, etc. These calculations are carried out using the full-potential linearized augmented plane wave (FP-LAPW) method, implemented in Wien2k software. The monochalcogenide compound TlSe adopts a tetragonal structure with I4/mcm space group symmetry (No. 140). We determined the ground-state values by calculating the total energy as a function of volume, relaxing the atomic positions for each volume, in order to minimize both the strength and the c/a ratio. Equilibrium structural parameters are derived from the internal structure parameters by fitting the total energy versus volume results with the Birch-Murnaghan equation of state. We studied the electronic properties using two approaches, GGA and TB-mbj. The latter approach gave an energy gap of 0.49 eV, close to the experimental value, which led us to adopt the TB-mbj approach in calculating optical properties such as the complex dielectric function <span>\\(\\mathrm\\varepsilon\\left(\\mathrm\\omega\\right)\\)</span>, complex refractive index <span>\\(\\mathrm N\\left(\\mathrm\\omega\\right)\\)</span>, optical reflectivity <span>\\(\\mathrm R\\left(\\mathrm\\omega\\right)\\)</span>, energy loss function <span>\\(\\mathrm L\\left(\\mathrm\\omega\\right)\\)</span>, optical absorption <span>\\(\\mathrm\\alpha\\left(\\mathrm\\omega\\right)\\)</span> and optical conductivity <span>\\(\\mathrm\\sigma\\left(\\mathrm\\omega\\right)\\)</span>.</p>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A DFT Investigation of the structural and optoelectronic properties of the tetragonal monochalcogenide TlSe for photovoltaics application\",\"authors\":\"Mounaim Bencheikh, Larbi El Farh, Allal Challioui\",\"doi\":\"10.1007/s11051-024-06043-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>In this paper, we examine the application of density functional theory (DFT) to determine the structural and optoelectronic properties of the tetragonal monochalcogenide TlSe, in order to assess its suitability for use in optoelectronic devices, photovoltaics, etc. These calculations are carried out using the full-potential linearized augmented plane wave (FP-LAPW) method, implemented in Wien2k software. The monochalcogenide compound TlSe adopts a tetragonal structure with I4/mcm space group symmetry (No. 140). We determined the ground-state values by calculating the total energy as a function of volume, relaxing the atomic positions for each volume, in order to minimize both the strength and the c/a ratio. Equilibrium structural parameters are derived from the internal structure parameters by fitting the total energy versus volume results with the Birch-Murnaghan equation of state. We studied the electronic properties using two approaches, GGA and TB-mbj. 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A DFT Investigation of the structural and optoelectronic properties of the tetragonal monochalcogenide TlSe for photovoltaics application
In this paper, we examine the application of density functional theory (DFT) to determine the structural and optoelectronic properties of the tetragonal monochalcogenide TlSe, in order to assess its suitability for use in optoelectronic devices, photovoltaics, etc. These calculations are carried out using the full-potential linearized augmented plane wave (FP-LAPW) method, implemented in Wien2k software. The monochalcogenide compound TlSe adopts a tetragonal structure with I4/mcm space group symmetry (No. 140). We determined the ground-state values by calculating the total energy as a function of volume, relaxing the atomic positions for each volume, in order to minimize both the strength and the c/a ratio. Equilibrium structural parameters are derived from the internal structure parameters by fitting the total energy versus volume results with the Birch-Murnaghan equation of state. We studied the electronic properties using two approaches, GGA and TB-mbj. The latter approach gave an energy gap of 0.49 eV, close to the experimental value, which led us to adopt the TB-mbj approach in calculating optical properties such as the complex dielectric function \(\mathrm\varepsilon\left(\mathrm\omega\right)\), complex refractive index \(\mathrm N\left(\mathrm\omega\right)\), optical reflectivity \(\mathrm R\left(\mathrm\omega\right)\), energy loss function \(\mathrm L\left(\mathrm\omega\right)\), optical absorption \(\mathrm\alpha\left(\mathrm\omega\right)\) and optical conductivity \(\mathrm\sigma\left(\mathrm\omega\right)\).
期刊介绍:
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.