Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots
A theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved using COMSOL-Multip...
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| Format: | Article |
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MDPI AG
2023-08-01
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| Series: | Condensed Matter |
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| Online Access: | https://www.mdpi.com/2410-3896/8/3/66 |
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| author | Rafael G. Toscano-Negrette José C. León-González Juan A. Vinasco Alvaro L. Morales Miguel E. Mora-Ramos Carlos A. Duque |
| author_facet | Rafael G. Toscano-Negrette José C. León-González Juan A. Vinasco Alvaro L. Morales Miguel E. Mora-Ramos Carlos A. Duque |
| author_sort | Rafael G. Toscano-Negrette |
| collection | DOAJ |
| description | A theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved using COMSOL-Multiphysics software in the 2D axisymmetric module, which employs the finite element method under the effective mass approximation. A Fortran code was utilized to calculate excitonic energy, specifically designed to solve the Coulomb integral. The calculations encompassed variations in the inner radius (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mn>1</mn></msub></semantics></math></inline-formula>), as well as variations in the electric (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>F</mi><mi>z</mi></msub></semantics></math></inline-formula>) and magnetic (<i>B</i>) fields along the <i>z</i>-axis. The absorption coefficients were determined for transitions between the hole and electron ground states, considering <i>z</i>-polarized incident radiation. Including a magnetic field increases the transition energy, consequently causing the absorption peaks to shift toward the blue region of the spectrum. On the other hand, the electric field decreased the overlap of the electron and hole wavefunctions. As a result, the amplitude of the absorption peaks decreased with an increase in the electric field. |
| first_indexed | 2024-03-10T22:54:21Z |
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| issn | 2410-3896 |
| language | English |
| last_indexed | 2024-03-10T22:54:21Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Condensed Matter |
| spelling | doaj.art-93c5b11d476542b5947c16bdb24836872023-11-19T10:07:46ZengMDPI AGCondensed Matter2410-38962023-08-01836610.3390/condmat8030066Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum DotsRafael G. Toscano-Negrette0José C. León-González1Juan A. Vinasco2Alvaro L. Morales3Miguel E. Mora-Ramos4Carlos A. Duque5Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, ColombiaGrupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, ColombiaGrupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, ColombiaGrupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, ColombiaCentro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca CP 62209, Morelos, MexicoGrupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, ColombiaA theoretical analysis was conducted to examine the electronic and optical properties of a confined electron and a hole in a type-II core-shell spherical quantum dot composed of CdSe/ZnTe and ZnTe/CdSe. The Schrödinger equation for the electron and the hole was numerically solved using COMSOL-Multiphysics software in the 2D axisymmetric module, which employs the finite element method under the effective mass approximation. A Fortran code was utilized to calculate excitonic energy, specifically designed to solve the Coulomb integral. The calculations encompassed variations in the inner radius (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mn>1</mn></msub></semantics></math></inline-formula>), as well as variations in the electric (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>F</mi><mi>z</mi></msub></semantics></math></inline-formula>) and magnetic (<i>B</i>) fields along the <i>z</i>-axis. The absorption coefficients were determined for transitions between the hole and electron ground states, considering <i>z</i>-polarized incident radiation. Including a magnetic field increases the transition energy, consequently causing the absorption peaks to shift toward the blue region of the spectrum. On the other hand, the electric field decreased the overlap of the electron and hole wavefunctions. As a result, the amplitude of the absorption peaks decreased with an increase in the electric field.https://www.mdpi.com/2410-3896/8/3/66type-II quantum dotabsorption coefficientZnTe/CdSeCdSe/ZnTemagnetic fieldelectric field |
| spellingShingle | Rafael G. Toscano-Negrette José C. León-González Juan A. Vinasco Alvaro L. Morales Miguel E. Mora-Ramos Carlos A. Duque Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots Condensed Matter type-II quantum dot absorption coefficient ZnTe/CdSe CdSe/ZnTe magnetic field electric field |
| title | Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots |
| title_full | Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots |
| title_fullStr | Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots |
| title_full_unstemmed | Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots |
| title_short | Effect of External Fields on the Electronic and Optical Properties in ZnTe/CdSe and CdSe/ZnTe Spherical Quantum Dots |
| title_sort | effect of external fields on the electronic and optical properties in znte cdse and cdse znte spherical quantum dots |
| topic | type-II quantum dot absorption coefficient ZnTe/CdSe CdSe/ZnTe magnetic field electric field |
| url | https://www.mdpi.com/2410-3896/8/3/66 |
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