Pseudopotential Study of CdTe Quantum Dots: Electronic and Optical Properties

Mezrag, F.; Bouarissa, N.

doi:10.1590/1980-5373-mr-2017-1146

Cited by 10 publications

(4 citation statements)

References 26 publications

(15 reference statements)

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“…CdSe, another prominent QD used in solar cells, had a size range of 1.2-4.1 nm [25] and the resultant wavelength range was 275-659 nm. Similarly, CdTe had its shortest and longest wavelengths as 274 nm and 784 nm respectively, resulting from having 1.2 nm as its smallest radius and 5.0 nm as its largest [26]. Our calculations gave similar results for the selected compounds from the III-V and IV-VI periodic groups.…”

Section: B Selection and Analysis Of Materialssupporting

confidence: 62%

Tuning the Optical Properties of Quantum Dots to Increase the Efficiency of Solar Cells

Ghatiwala¹,

Academics²

2020

IJERT

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Quantum Dot Solar Cells (QDSC) are a promising class of third-generation solar cells that are being developed to deliver pathbreaking efficiencies as a result of the unique optical properties of quantum dots, and this paper aims to increase their currently dismaying efficiency. Based on the size-based tunability of quantum dot band gaps, a model is developed that relies on absorbing a larger span of energies for photons to efficiently convert them to excitons. By considering a set of binary compounds used as semiconductor materials in quantum dots and processing them through mathematical equations derived from Schrödinger's equation for an electron in an infinite potential well, a final group of candidates in a range of sizes are selected based on their wavelength absorption ranges and coverage of the solar spectrum. These quantum dot candidates are then finalized considering material characterizations and are arranged in a photovoltaic cell to generate maximum efficiency. A layer-by-layer process is discussed for deposition, while a method of effective size distribution is proposed. An analysis of energy losses including electron recombination and surface defects are further discussed, and solutions are proposed. The end product is a framework for highly efficient quantum dot structures within a QDSC that can be employed commercially.

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Section: B Selection and Analysis Of Materialssupporting

confidence: 62%

Tuning the Optical Properties of Quantum Dots to Increase the Efficiency of Solar Cells

Ghatiwala¹,

Academics²

2020

IJERT

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“…This is true for semiconductor materials in bulk and nanostructures. [38][39][40] In the present case, n is obtained in the quantum dots GaSb within a spherical shape vs a quantum dot size which ranges in the interval 1-10 nm. The following models were used to calculate n: (i) The Moss relation 41 according to Ravindra and Srivastava.…”

Section: Resultsmentioning

confidence: 97%

Gallium Antimonide Spherical Semiconductor Quantum Dots

lakhal

Mezrag

Bouarissa

2022

ECS J. Solid State Sci. Technol.

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The quantum effects at the nano-metric level have been observed in a variety of confined structures, particularly in semiconductor quantum dots. Here, the electronic and optical properties of GaSb spherical semiconductor quantum dots were investigated. For the calculations, the pseudo potential approach was employed. The size dependence of the energy gaps at Г, X, and L points, the effective masses of electrons and heavy-holes, the refractive index, and the dielectric function for a studied GaSb spherical quantum dot are analyzed and discussed. When the degree of quantum confinement effect was changed by decreasing the radius of the spherical quantum dots, a striking charge in comparison to the bulk values has been obtained. Our results indicate that as the quantum dot radius is raised, most of properties rapidly decrease. This demonstrates an improvement in the mobility of the material. However, the refractive index and the dielectric constant are increased with increasing the radius of the nano-crystal.

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“…In particular, over the past decades, semiconductor quantum dots (QDs) have received considerable attention among research communities due to their widespread use in optoelectronic devices [1][2][3][4]. When QDs are subjected to electric energy or light, they emit light of a specific wavelength, which can be tuned by changing the size, shape, and material composition of the QDs [5]. Therefore, the properties of QDs vary drastically depending on the size, shape and material.…”

Section: Introductionmentioning

confidence: 99%

Comparative energy bandgap analysis of zinc and tin based chalcogenide quantum dots

Ahamed

Kumar³

et al. 2022

Rev. Mex. Fís.

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Semiconductors with wide bandgap are crucial for optoelectronic devices and energy applications owing to their electron confinement, high optical transparency and tunable electrical conductivity. Therefore, in this study, the quantum confinement effect of the energy bandgap of chalcogenide semiconductor nanocrystals such as ZnS, ZnSe, ZnTe, SnS, SnSe and SnTe are studied based on the Brus model using the effective mass approximation, the hyperbolic band model and the cohesive energy model. The obtained results indicate that the value of energy bandgap differs from the bulk crystals related to the quantum confinement effect. These verdicts confirm the quantum confinement effects of materials and their potential applications in optoelectronic devices. Theoretical findings are compared with its valid experimental data.

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Pseudopotential Study of CdTe Quantum Dots: Electronic and Optical Properties

Cited by 10 publications

References 26 publications

Tuning the Optical Properties of Quantum Dots to Increase the Efficiency of Solar Cells

Tuning the Optical Properties of Quantum Dots to Increase the Efficiency of Solar Cells

Gallium Antimonide Spherical Semiconductor Quantum Dots

Comparative energy bandgap analysis of zinc and tin based chalcogenide quantum dots

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