Electric properties of the interface quantum dot - matrix

Peleshchak, Roman; Bachynsky,

doi:10.5488/cmp.12.2.215

Cited by 6 publications

(5 citation statements)

References 13 publications

(18 reference statements)

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“…For the interface between the domains, the BenDaniel–Duke boundary conditions 34,35 is applied as:Equation (7) represents the continuity of the RDF across the interface in the zeroth order differential. The BenDaniel-Duke boundary conditions cause the continuity of the probability current densities at the interface (eq.…”

Section: The Model and Theorymentioning

confidence: 99%

Wavefunction Engineering of Type-I/Type-II Excitons of CdSe/CdS Core-Shell Quantum Dots

Nandan

Mehata

2019

Sci Rep

102

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Nanostructured semiconductors have the unique shape/size-dependent band gap tunability, which has various applications. The quantum confinement effect allows controlling the spatial distribution of the charge carriers in the core-shell quantum dots (QDs). Upon increasing shell thickness (e.g., from 0.25–3.25 nm) of core-shell QDs, the radial distribution function (RDF) of hole shifts towards the shell suggesting the confinement region switched from Type-I to Type-II excitons. As a result, there is a jump in the transition energy towards the higher side (blue shift). However, an intermediate state appeared as pseudo Type II excitons, in which holes are co-localized in the shell as well core whereas electrons are confined in core only, resulting in a dual absorption band (excitation energy), carried out by the analysis of the overlap percentage using the Hartree-Fock method. The findings are a close approximation to the experimental evidences. Thus, the understanding of the motion of e-h in core-shell QDs is essential for photovoltaic, LEDs, etc.

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Section: The Model and Theorymentioning

confidence: 99%

Wavefunction Engineering of Type-I/Type-II Excitons of CdSe/CdS Core-Shell Quantum Dots

Nandan

Mehata

2019

Sci Rep

102

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“…The electron energy spectra were calculated numerically, by using the shooting method [19] on the basis of the solution of the Schrödinger equation (15) with the quantizing potential into account in the interval of QD sizes 30Å ≤ ≤ 0 ≤ 100Å. In particular, the reduction of the energies of the ground and excited electron states is less pronounced (by 6 meV) in the QD size interval 30Å ≤ 0 ≤ 40Å than in the interval 60Å ≤ 0 ≤ 100Å (by 8-16 meV).…”

Section: Results Of Calculations and Their Discussionmentioning

confidence: 99%

“…where Ω 0 is the elementary cell volume. The solution of the Schrödinger equation (15) in the spherical coordinate system is sought in the form…”

Section: Profile and Depth Of Quantizing Potential For A Stressed Nanmentioning

confidence: 99%

Influence of Electron-Deformation Effects on the Electron Structure of Quantum Dots in Stressed Nanoheterosystems

Peleshchak¹,

Kulyk²

2014

Ukr. J. Phys.

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In the framework of the self-consistent electron-deformation model, the theory describing the formation of the quantum potential band profile and the energy levels of an electron and a hole in a stressed nanoheterosystem with coherently-strained quantum dots has been developed, and their dependences on the degree of doping of the nanoheterosystem matrix and the quantum dot surface concentration have been analyzed. The character of the quantum potential in the nanoheterosystem is shown to be governed not only by the mechanical component of the electron-deformation potential, but also by the energy of electrostatic interaction between charges in a vicinity of the quantum dot-matrix interface, where the latter induces additional quasi-triangular potential barriers and wells.

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“…where ( ) is the solution averaged over a sphere with the radius . The concentration of charge carriers in the strained nanoheterostructure with a QD was found to equal [12]…”

Section: )mentioning

confidence: 98%

“…(mech) is the sum of the diagonal components in the mechanical strain tensor for the QD material, and Sp^( 1) el−def ( ) is the sum of the diagonal components in the tensor of electrondeformation strain component [12]. Self-consistent electron-deformation effects, which arise due to the coupling between the lattice deformation and the electron subsystem, additionally enhance polaron effects in comparison with those governing by the mechanical deformation only:…”

Section: )mentioning

confidence: 99%

Polaron State in the Self-Consistent Electron-Deformation Field of the Quantum Dot-Matrix System

Hrushka

Peleshchak

2017

Ukr. J. Phys.

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The potential well depth for an electron in a nanoheterosystem with quantum dots has been calculated in the framework of the self-consistent electron-deformation model. It is shown that the strained InAs/GaAs nanoheterosystem with InAs spherical quantum dots is characterized by deformation fields, which appear at the quantum dot-matrix interface and result in the enhancement of polaron effects in comparison with the unstrained material. The electron polaron energy is calculated, by considering the electrostatic energy and the energy associated with the mechanical and electron-deformation strain components in the quantum-dot and matrix materials. K e y w o r d s: quantum dot, polaron, electron-deformation potential, binding energy, electron.

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Electric properties of the interface quantum dot - matrix

Cited by 6 publications

References 13 publications

Wavefunction Engineering of Type-I/Type-II Excitons of CdSe/CdS Core-Shell Quantum Dots

Wavefunction Engineering of Type-I/Type-II Excitons of CdSe/CdS Core-Shell Quantum Dots

Influence of Electron-Deformation Effects on the Electron Structure of Quantum Dots in Stressed Nanoheterosystems

Polaron State in the Self-Consistent Electron-Deformation Field of the Quantum Dot-Matrix System

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