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Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects

A theoretical analysis of optical properties in a ZnS/CdS/ZnS core/shell/shell spherical quantum dot was carried out within the effective mass approximation. The corresponding Schrödinger equation was solved using the finite element method via the 2D axis-symmetric module of COMSOL-Multiphysics soft...

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Autores principales: Toscano-Negrette, Rafael G., León-González, José C., Vinasco, Juan A., Morales, A. L., Koc, Fatih, Kavruk, Ahmet Emre, Sahin, Mehmet, Mora-Ramos, M. E., Sierra-Ortega, José, Martínez-Orozco, J. C., Restrepo, R. L., Duque, C. A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9920453/
https://www.ncbi.nlm.nih.gov/pubmed/36770510
http://dx.doi.org/10.3390/nano13030550
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author Toscano-Negrette, Rafael G.
León-González, José C.
Vinasco, Juan A.
Morales, A. L.
Koc, Fatih
Kavruk, Ahmet Emre
Sahin, Mehmet
Mora-Ramos, M. E.
Sierra-Ortega, José
Martínez-Orozco, J. C.
Restrepo, R. L.
Duque, C. A.
author_facet Toscano-Negrette, Rafael G.
León-González, José C.
Vinasco, Juan A.
Morales, A. L.
Koc, Fatih
Kavruk, Ahmet Emre
Sahin, Mehmet
Mora-Ramos, M. E.
Sierra-Ortega, José
Martínez-Orozco, J. C.
Restrepo, R. L.
Duque, C. A.
author_sort Toscano-Negrette, Rafael G.
collection PubMed
description A theoretical analysis of optical properties in a ZnS/CdS/ZnS core/shell/shell spherical quantum dot was carried out within the effective mass approximation. The corresponding Schrödinger equation was solved using the finite element method via the 2D axis-symmetric module of COMSOL-Multiphysics software. Calculations included variations of internal dot radius, the application of electric and magnetic fields (both oriented along z-direction), as well as the presence of on-center donor impurity. Reported optical properties are the absorption and relative refractive index change coefficients. These quantities are related to transitions between the ground and first excited states, with linearly polarized incident radiation along the z-axis. It is found that transition energy decreases with the growth of internal radius, thus causing the red-shift of resonant peaks. The same happens when the external magnetic field increases. When the strength of applied electric field is increased, the opposite effect is observed, since there is a blue-shift of resonances. However, dipole matrix moments decrease drastically with the increase of the electric field, leading to a reduction in amplitude of optical responses. At the moment impurity effects are activated, a decrease in the value of the energies is noted, significantly affecting the ground state, which is more evident for small internal radius. This is reflected in an increase in transition energies.
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spelling pubmed-99204532023-02-12 Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects Toscano-Negrette, Rafael G. León-González, José C. Vinasco, Juan A. Morales, A. L. Koc, Fatih Kavruk, Ahmet Emre Sahin, Mehmet Mora-Ramos, M. E. Sierra-Ortega, José Martínez-Orozco, J. C. Restrepo, R. L. Duque, C. A. Nanomaterials (Basel) Article A theoretical analysis of optical properties in a ZnS/CdS/ZnS core/shell/shell spherical quantum dot was carried out within the effective mass approximation. The corresponding Schrödinger equation was solved using the finite element method via the 2D axis-symmetric module of COMSOL-Multiphysics software. Calculations included variations of internal dot radius, the application of electric and magnetic fields (both oriented along z-direction), as well as the presence of on-center donor impurity. Reported optical properties are the absorption and relative refractive index change coefficients. These quantities are related to transitions between the ground and first excited states, with linearly polarized incident radiation along the z-axis. It is found that transition energy decreases with the growth of internal radius, thus causing the red-shift of resonant peaks. The same happens when the external magnetic field increases. When the strength of applied electric field is increased, the opposite effect is observed, since there is a blue-shift of resonances. However, dipole matrix moments decrease drastically with the increase of the electric field, leading to a reduction in amplitude of optical responses. At the moment impurity effects are activated, a decrease in the value of the energies is noted, significantly affecting the ground state, which is more evident for small internal radius. This is reflected in an increase in transition energies. MDPI 2023-01-29 /pmc/articles/PMC9920453/ /pubmed/36770510 http://dx.doi.org/10.3390/nano13030550 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Toscano-Negrette, Rafael G.
León-González, José C.
Vinasco, Juan A.
Morales, A. L.
Koc, Fatih
Kavruk, Ahmet Emre
Sahin, Mehmet
Mora-Ramos, M. E.
Sierra-Ortega, José
Martínez-Orozco, J. C.
Restrepo, R. L.
Duque, C. A.
Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title_full Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title_fullStr Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title_full_unstemmed Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title_short Optical Properties in a ZnS/CdS/ZnS Core/Shell/Shell Spherical Quantum Dot: Electric and Magnetic Field and Donor Impurity Effects
title_sort optical properties in a zns/cds/zns core/shell/shell spherical quantum dot: electric and magnetic field and donor impurity effects
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9920453/
https://www.ncbi.nlm.nih.gov/pubmed/36770510
http://dx.doi.org/10.3390/nano13030550
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