Strain effect on the intraband absorption coefficient for spherical CdSe/CdS/ZnSe core–shell–shell quantum dots

Rodríguez-Magdaleno, K.A.; Pérez‐Álvarez, R.; Ungan, F.; Martı́nez-Orozco, J.C.

doi:10.1016/j.mssp.2021.106400

Cited by 12 publications

(9 citation statements)

References 39 publications

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“…In 2016, Kwang Seob Jeong et al studied the performance of CdS CQDs, CdSe CQDs, and the core/shell structure [ 71 ], which showed an increase of the intraband photoluminescence with the increasing shell thickness ( Figure 8 b). In 2022, Rodriguez-Magdaleno et al calculated the intraband absorption coefficient between the 1S and 1P of spherical CdSe/CdS/ZnSe CQDs [ 72 ]. As the inner shell size increased, the intraband coefficient redshifted by approximately 0.044 eV and 0.037 eV ( Figure 8 c).…”

Section: Infrared Photodetectors Based On Intraband Transitionmentioning

confidence: 99%

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The Historical Development of Infrared Photodetection Based on Intraband Transitions

et al. 2023

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The infrared technology is entering widespread use as it starts fulfilling a growing number of emerging applications, such as smart buildings and automotive sectors. Majority of infrared photodetectors are based on interband transition, which is the energy gap between the valence band and the conduction band. As a result, infrared materials are mainly limited to semi-metal or ternary alloys with narrow-bandgap bulk semiconductors, whose fabrication is complex and expensive. Different from interband transition, intraband transition utilizing the energy gap inside the band allows for a wider choice of materials. In this paper, we mainly discuss the recent developments on intraband infrared photodetectors, including ‘bottom to up’ devices such as quantum well devices based on the molecular beam epitaxial approach, as well as ‘up to bottom’ devices such as colloidal quantum dot devices based on the chemical synthesis.

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Section: Infrared Photodetectors Based On Intraband Transitionmentioning

confidence: 99%

Section: Infrared Photodetectors Based On Intraband Transitionmentioning

confidence: 99%

The Historical Development of Infrared Photodetection Based on Intraband Transitions

et al. 2023

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“…This approach constitutes a potent method for elucidating the characteristics of QDs. Size quantization significantly affects the absorption capacity of such systems [30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Single electron states and intraband absorption in dumbbell quantum dot

Yengibaryan

2024

Nanophotonics X

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In this study, we investigated electronic properties of a dumbbell-shaped quantum dot (QD) made from gallium arsenide. For this purpose, we employ the finite element method. Our investigation begins by calculating the wave functions and energies of the ground state and the first nine excited states. This allows us to understand how the quantum dot's shape impacts its electronic structure. Based on the obtained results for the wave functions and energies of one electron, we calculated the oscillator strengths for different quantum transitions. We discover that the most pronounced absorption occurs during transitions between the ground state and the second, third, eighth, and ninth excited states. Additionally, we analyzed the absorption processes between these energy levels and revealed the dependence of the absorption coefficient for the intraband transitions dumbbell-shaped QD on the energy of the incident light.

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“…Among the most studied QDs, different geometrical shapes are present: cylindrical, pyramidal, conical, and spherical [ 22 , 23 , 24 , 25 ]. In this work, we focus on studying a kind of core/shell/shell spherical QD, which consists of a semiconductor material surrounded by another one which exhibits a different value of the energy band gap.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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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Strain effect on the intraband absorption coefficient for spherical CdSe/CdS/ZnSe core–shell–shell quantum dots

Cited by 12 publications

References 39 publications

The Historical Development of Infrared Photodetection Based on Intraband Transitions

The Historical Development of Infrared Photodetection Based on Intraband Transitions

Single electron states and intraband absorption in dumbbell quantum dot

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

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