Energy spectrum of an exciton in a CdSe/ZnTe type-II core/shell spherical quantum dot

Chafai, A.; Dujardin, F.; Essaoudi, I.; Ainane, A.

doi:10.1016/j.spmi.2016.11.017

Cited by 22 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted, At this point, that the investigation of excitonic complexes inside nitride-free QDs is also extensively reported by the past, and one can refer, for instance, to Refs. [32,34,35,36,37]…”

Section: Introductionmentioning

confidence: 99%

Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis

Chafai,

Essaoudi,

Ainane

et al. 2023

Mat & Dev

View full text Add to dashboard Cite

Many body interactions between single particles inside low-dimensional semiconducting materials play a critical role in their optical characteristics. Within this context, tuning trionic and excitonic binding energy enables tailoring of the optical band gap of a given material. In this paper, we theoretically investigated the binding energy (Eb) of negatively charged excitons inside GaN/AlN type-I, and AlN/GaN inverted type-I core/shell quantum dots. Firstly, we started our study by examining the variation in the energy of electrons (holes) according to the change in the internal and external radii { as a means to obtain an insight into the energetic behavior of non-correlated single particles inside the two understudied nanosystems. The feature of the radial probability density distribution of confined single particles and negative trions is also discussed. Afterwards, we examined the impact of the heteronanodot spatial parameters (core radius and shell thickness) on the binding energy of confined trions. A comparison between the Eb behavior of negative trions inside core/shell type-I, and reversed type-I nanodots is also highlighted. Our results exhibit a strong dependence of the negative trion binding energy on the core material size and the shell thickness, and on the core-to-shell band mismatch as well. The obtained data also show the opportunity of modulating the negatively charged exciton correlation energy in a broad range extending from 220 to 650 meV . That paves the way for new optoelectronic devices based on III-Nitride core/shell quantum dots.

show abstract

Section: Introductionmentioning

confidence: 99%

Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis

Chafai,

Essaoudi,

Ainane

et al. 2023

Mat & Dev

View full text Add to dashboard Cite

show abstract

“…Other work has focused on the study of systems consisting of electron and hole in core/shell QD [11]. For example, the theoretical study reported by Chafai et al [12] investigated the binding energy of an exciton inside a CdSe/ZnTe core/shell spherical QD by taking into account the radius dependence of the dielectric constant and effective mass of the charge carriers, and using the shell function approximation. Sun et al [13] have studied the polaron characteristics of GaAs/AlxGa1-xAs core-shell cylindrical nanowires.…”

Section: Introductionmentioning

confidence: 99%

Uncorrelated Excitonic Properties in Multilayered Cylindrical Quantum Dot

Hbibi

Mommadi

Boussetta

et al. 2022

SSP

View full text Add to dashboard Cite

The unbound exciton properties in multilayered cylindrical quantum dot (CQD) (core/shell/shell) have been studied theoretically, within the effective mass approximation and two-band model. The uncorrelated energy of an exciton confined in GaAs/Ga1-x1Alx1As/Ga1-x2Alx2As CQD as a function of the core and first shell radius is presented. The numerical results show that the quantum dot size and the confinement potentials depth significantly adjust the ground state uncorrelated energy of exciton. However, the exciton wave function parameters are dependent on the core and first shell radius (R1 and R2), as well as the concentration of the barrier’s materials.

show abstract

“…It has long established that their nano-scale size that is comparable to Bohr radius gives rise to a strong localization of charge carriers compared to their bulk counterparts. The small size property of quantum dots causes it to have a high surface to volume ratio (quantum dots with radius of 5 nm may still have 10 4 atoms), made its surface to play a significant role, which sometimes can be considered as a drawback due to possibility of having defects on its surface [7,8]. But many research have discovered that it is possible to cap or encapsulate these quantum dots surfaces with another organic or inorganic semiconductor materials in order to enhance their optical and electrical properties as described in [5,10,9,11].…”

Section: Introductionmentioning

confidence: 99%

“…The motivations of passivating quantum dots surfaces are to provide electrical and chemical passivation [6,7] that will improve the photostability of the quantum dots against oxidation [6,8] as well as to increase the confinement of charge carriers and making its transition energy more tunable [3,6,16,7,8]. Inorganic capping materials can also reduce the chemical activity due to cationic and anionic dangling bonds [7].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, a study to investigate relation between shell thickness and transition energy of CSQDs is very crucial. Different approaches had been introduced such as single-band model [3,13,6,16,7,8,5], multiband theory (8-band model) [13,15,14], envelope function [6], density-functional theory (DFT) [4] and model-solid theory [3]. In this paper, on top of applying the single-band model onto our CSQDs, we will also introduce two different types of confinement; strong confinement and weak confinement model that are based on strengths of potential steps on conduction and valence bands, instead of just depending on their core sizes as suggested in [1] and [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transition Energy in Strong and Weak Confinement of Type-I Spherical Core-shell Quantum Dots

Shelawati,

Nurisya,

Tim

et al. 2018

Preprint

View full text Add to dashboard Cite

In this paper, we present a mathematical approach in estimating transition energy of type-I core-shell quantum dots (CSQDs) in strong and weak confinement of charge carriers within the core materials. We will do this by using effective-mass approximation together with a single-band model. The effects of potential step of conduction band and valence band on confinement strength will be discussed. It can be seen at the end of this paper that for a same size CSQDs, CSQDs with bigger potential steps will have stronger carriers confinement and with more localized excitons.

show abstract

Energy spectrum of an exciton in a CdSe/ZnTe type-II core/shell spherical quantum dot

Cited by 22 publications

References 32 publications

Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis

Insight into negative trions binding energy behavior inside type-I and reversed type-I core/shell quantum dots: A variational analysis

Uncorrelated Excitonic Properties in Multilayered Cylindrical Quantum Dot

Transition Energy in Strong and Weak Confinement of Type-I Spherical Core-shell Quantum Dots

Contact Info

Product

Resources

About