Leshko O. Optical Properties of Spherical Non-Concentric Core-Shell Quantum Dots

Українська версія

Thesis for the degree of Doctor of Philosophy (PhD)

State registration number

0825U004313

Thesis Registration Form

0825U004313.pdf

Applicant for

Specialization

  • 105 - Прикладна фізика та наноматеріали

10-12-2025

Specialized Academic Board

PhD 10999

Drohobych Ivan Franko State Pedagogical University

Essay

Leshko O. V. Optical Properties of Spherical Non-Concentric Core-Shell Quantum Dots. - Manuscript. Dissertation for the degree of Doctor of Philosophy (Candidate of Physical and Mathematical Sciences) in the specialty 105 "Applied Physics and Nanomaterials" – Physics of Semiconductors and Dielectrics – Drohobych Ivan Franko State Pedagogical University, of the Ministry of Education and Science of Ukraine, Drohobych, 2025. The dissertation is devoted to the theoretical study of the influence of the nonconcentricity parameter of a spherical core–shell quantum dot on the electronic and hole states, as well as on the optical parameters of such systems. The investigations were conducted for quantum dots within the approximation of rectangular potential wells and barriers, the effective mass method, and the dielectric continuum model. The electron and hole wave functions and their energy spectra were calculated using the plane wave method, the variational method, and the finite element method. The study of the influence of the non-concentricity parameter in spherical core–shell quantum dots is important for understanding the dependence of electronic and hole states on the layer dimensions of the quantum dot, as well as for the correction and prediction of the optical parameters of such nanostructures. The results of the research can be applied in the development of new optical devices, particularly in improving the performance of light-emitting diodes, electromagnetic wave detectors, and solar concentrators. The practical significance of the obtained results. Studies have shown that the displacement of the core relative to the shell significantly affects the optical properties of core–shell quantum dots, enabling targeted tuning of their characteristics. This is especially important for the development of non-blinking light-emitting diodes, as optimizing electron–hole interactions and impurity states reduces energy losses. The results can also be applied in the design of infrared detectors for night vision or terahertz detectors for contactless security screening. Furthermore, the identified patterns help mitigate the effects of defects, enhancing the stability and longevity of optoelectronic devices. The obtained results can be used to predict the properties of quantum dots and adapt them to specific industrial applications. The discovered influence of non-concentricity and electric field on energy levels enables the creation of highly efficient luminescent centers to improve energy transfer in solar concentrators. This opens up opportunities to increase the efficiency of solar energy conversion devices by reducing radiation losses. Such findings will contribute to the development of advanced materials for photonics with tunable optical properties. Thus, the scientific results obtained have broad practical significance for modern technologies in the fields of energy, optoelectronics, and nanomaterials. Keywords: impurity, electronic and hole states, energy spectrum, semiconductor nanoparticle, exchange interaction, optical absorption coefficient, non-concentricity parameter, spherical non-concentric core-shell quantum dot.

Read more

Research papers

1. Leshko R. Ya., Bilynskyi I. V., Leshko O. V. Electron-hole exchange interaction in a spherical quantum dot with regard material deformation and polarization charges. Journal of Physical Studies. 2022. Vol. 26, № 1. P. 1720:1-10.

2. Leshko R. Ya., Bilynskyi I. V., Leshko O. V., Holskyi V. B. Electron energy spectrum of the spherical GaAs/AlxGa1−xAs quantum dot with several impurities on the surface. Condensed Matter Physics. 2023. Vol. 26, №. 2. P. 23704: 1–8.

3. Bilynskyi I., Leshko R., Leshko O., Terletska H., Pazuyk R., Voitovych Kh. Impurity states in non-concentric spherical core-shell quantum dot. Physics and Chemistry of Solid State. 2024. Vol. 25, № 1. P. 98-103.

4. Leshko R. Ya., Bilynskyi I. V., Leshko O. V., Popov M. Yu., Ocheretyanyi A. O. Electron and hole energy spectrum of non-concentric spherical core-shell quantum dot under an externally applied electric field. Condensed Matter Physics. 2024. Vol. 27, №. 4. P.43703: 1-8.

5. Leshko R. Ya., Leshko O. V., Bilynskyi I. V., Pazyuk R. I. Electron-hole exchange interaction in the non-concentric spherical core-shell quantum dot. Journal of Physical Studies. 2025. Vol. 26, № 1. P. 1720:1-10.

6. Leshko R. Ya., Bilynskyi I. V., Leshko O. V., Slusarenko M. A. Electron energy spectrum of the non-concentric spherical core-shell quantum dot. Micro and Nanostructures. 2023. Vol. 181. P. 207615:1-8.

7. Leshko R. Ya., Leshko O. V., Bilynskyi I. V., Holskyi V. B. Optical absorption coefficient of non-concentric spherical core-shell quantum dot. Optics Communications. 2024. Vol. 566. P. 130722:1-5.

8. Leshko R., Leshko O. Interband and intraband electromagnetic wave absorption of non-concentric spherical core-shell quantum dots. VIII Всеукраїнська науково-практична конференція MEICS-2023. Дніпро, 22- 24 листопада 2023 р. С. 258-259.

9. Leshko O. V., Leshko R. Ya. Effect of electric field of the electron and hole energy spectra of non-concentric spherical core-shell quantum dot. ХІХ International Freik Conference on Physics and Technology of Thin Films and Nanosystems. Ivanо-Frankivsk, October 09-14, 2023. P. 46.

10. Leshko R. Ya., Bilynskyi I. V., Leshko O. V. Interlevel absorption of electromagnetic waves of the non-concentric spherical core-shell quantum dot. International Scientific and Technical Conference “Laser Technologies. Lasers and Their Application. LTLA-2023”. Truskavets, Ukraine, Rzeszów, Poland, June 29 - June 30, 2023. P. 11.

11. Leshko R. Ya. Leshko O. V., Shypytyak T. E. Features of the electronic energy spectrum of non-concentric spherical core-shell quantum dots. IX Ukrainian Scientific Conference on Physics of Semiconductors (USCPS-9). Uzhhorod, Ukraine, May 22-26, 2023. P. 120.

12. Leshko R. Ya., Leshko O. V., Bilynskyi I. V. The influence of impurities and electric fields on light absorption by spherical non-concentric core-shell quantum dots. XI-th International Conference “Topical Problems of Semiconductor Physics”. Prykarpattya, Drohobych, Ukraine, May 27-31, 2024. P. 44.

13. Bilynskyi I., Popov M., Leshko R., Leshko O. The doped non-concentic coreshell quantum dots under applied electric field. IX Всеукраїнська науковопрактична конференція MEICS-2024. Дніпро, 27-29 листопада 2024 р. С. 271-272.

14. Лешко Р., Лешко О., Хомин П. Електронні і діркові енергетичні спектри сферичної неконцентричної квантової точки типу ядро-оболонка. «Лашкарьовські читання». Конференція молодих вчених з фізики напівпровідників. Київ, 3-4 квітня 2025 р. С. 37-38.

Read more

Files

autoreferat-АНОТАЦІЇ Лешко О-В-.docx

Дисертація Лешко О-В-.pdf

Similar theses

0826U000509

Yevhenii SHEPOTKO

Flexible thermoelectric, triboelectric and piezoelectric device structures based on nanostructured layers of semiconductors and biopolymer nanocomposites

0826U000438

Taras V. Pryimak

Transformation of the impedance spectra of biological tissues under the influence of destructive factors.

0825U004104

Dariіa L. Popadiuk

The influence of crystal structure on magnetostatic and magnetodynamic properties of epitaxial films of Heusler alloys

0825U003918

Svitlana A. Lisovska

Structure, morphology and electrochemical properties of electrode materials of charge storage systems.

0825U003795

Ihor V. Sukhenko

Electronic structure of lead and calcium apatites, doped with transition metals and carbonate ions.