Theoretical studies on third nonlinear optical susceptibility in CdTe–CdS–ZnS core–shell–shell quantum dots

Zeiri, N.; Naifar, A.; Nasrallah, S. Abdi-Ben; Saïd, M.

doi:10.1016/j.photonics.2019.100725

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…The new material on the surface has a higher E g than the core material, facilitating electronic confinement. 17,20,21 Generating individual layers or monolayers free of structural defects has been reported to be the best way to optimize the optical properties of CdE QDs, whereby photobleaching and luminescence loss are prevented, and electronic confinement is facilitated. 39 Two types of layers have been studied thus far (Type I and Type II), which differ mainly in the location of conduction and valence bands and therefore, the E g of the core material.…”

Section: Resultsmentioning

confidence: 99%

“…17–19 This type of array has gained importance over the last two decades, enabling complete synthetic control over the QD electronic structure. 20,21…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19] This type of array has gained importance over the last two decades, enabling complete synthetic control over the QD electronic structure. 20,21 Complementary studies, such as electronic structure simulations, provide insight into the atomic geometry of a cluster. These calculations may not always be realistic but can elucidate atomistic details of the interaction between surface atoms and organic ligands.…”

Section: Introductionmentioning

confidence: 99%

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Aqueous-phase synthesized CdTe quantum dots: an insight into nanoparticle architecture-quantum yield relationship, characterization, and computational study of small clusters

2022

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Section: Resultsmentioning

confidence: 99%

“…17–19 This type of array has gained importance over the last two decades, enabling complete synthetic control over the QD electronic structure. 20,21…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aqueous-phase synthesized CdTe quantum dots: an insight into nanoparticle architecture-quantum yield relationship, characterization, and computational study of small clusters

2022

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“…Parzivi (2015) estudió transiciones ópticas interbanda en puntos cuánticos cónicos, de GaAs rodeados de InGaAs , encontrando que la fotoluminiscencia disminuía en energía al aumentar el espesor de la capa de soporte del punto (wetting layer), lo cual concuerda con resultados experimentales. Zeiri et al (2019) investigaron la susceptibilidad no lineal en puntos cuánticos esféricos de CdTe-CdS-ZnS, coraza-capa-capa, encontrando que la susceptibilidad se desplaza hacia el rojo al aumentar el ancho de las capas y su magnitud aumenta al aumentar la energía del fotón incidente.…”

Section: Introductionunclassified

Punto cuántico cónico doble verticalmente acoplado de GaAs/AlxGa1-xAs bajo efectos de presión hidrostática y temperatura

Rey

Aristizábal

Aramburo

et al. 2022

reveia

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Partiendo de una estructura compuesta de dos pozos cuánticos cónicos (CQDs) verticalmente acoplados de GaAs rodeados de AlxGa1-xAs en una concentración de 0,3, se estudia en primer lugar como las dimensiones del sistema causan un cambio en el confinamiento, para esto se varía la altura del pozo cuántico superior y se encuentra la óptima para trabajar, con esto definido, se evalúan los efectos de la presión hidrostática (entre 0 GPa y 3 GPa) y la temperatura (entre 0 K y 300 K) en la masa efectiva, el ancho de banda prohibida (Gap), la constante dieléctrica y su impacto sobre las autoenergías y autofunciones del sistema. Además, se evalúan los efectos al incluir la presencia de una impureza en la estructura ubicada en el pozo cuántico inferior. Haciendo uso del método de elementos finitos, se evidencian variaciones en las energías y funciones de onda del sistema, las cuales se deben a la alteración de la masa efectiva y de la nueva energía potencial. Analizando el comportamiento de la energía de enlace se nota un cambio en la constante dieléctrica cuando el sistema se encuentra sometido a una temperatura alrededor de 200 K debido a que sobre este valor el Gap pasa de ser directo a ser indirecto. Finalmente, la presencia de la impureza en el sistema genera un potencial adicional, en consecuencia, las energías en la estructura disminuyen bajo los efectos evaluados, haciendo cambios más contundentes en las funciones de onda y energías debido a este potencial.

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“…They have shown that the diminution of laser frequency and the enhancement of magnetic field lead to trapping and cooling the polaron. Later, Zeiri et al [21] have theoretically investigated the third nonlinear optical susceptibility in CdTe-CdS-ZnS spherical core-shell QNDs. Their results indicate that through increasing the shell width, the susceptibility peaks are red-shifted and with pump photon energy, the magnitude of susceptibility increases.…”

Section: Introductionmentioning

confidence: 99%

Diamagnetic susceptibility of bound exciton in cylindrical quantum nanodots under hydrostatic pressure and temperature effects

Mommadi¹,

Moussaouy²,

Belamkadem³

2020

Phys. Scr.

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In this paper, by using the variational method and the effective mass approximation, we have studied the diamagnetic and physical properties of an exciton confined in a cylindrical quantum nanodot. Our nanosystem is under the effects of hydrostatic pressure, temperature and mixed confinement potential. The diamagnetic susceptibility, the ground state energy and the correlation energy of exciton are illustrated in various regimes. The diamagnetic susceptibility computation leads to evaluate the stability of exciton. Our findings clearly show that the diamagnetic susceptibility of the bound exciton strongly enhances with increasing the hydrostatic pressure and decreases with augmenting temperature. On the other hand, it is also remarked that the diamagnetic susceptibility increases when the nanodot size is reduced. Furthermore, it is found that the ground state energy and the Coulombic correlation are strongly affected by the effects of hydrostatic pressure and temperature. To conclude, the hydrostatic pressure and temperature perturbations play an important role to enhance the intensity of electronic and optoelectronic devices through stabilizing the excitonic state properties.

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Theoretical studies on third nonlinear optical susceptibility in CdTe–CdS–ZnS core–shell–shell quantum dots

Cited by 17 publications

References 33 publications

Aqueous-phase synthesized CdTe quantum dots: an insight into nanoparticle architecture-quantum yield relationship, characterization, and computational study of small clusters

Aqueous-phase synthesized CdTe quantum dots: an insight into nanoparticle architecture-quantum yield relationship, characterization, and computational study of small clusters

Punto cuántico cónico doble verticalmente acoplado de GaAs/AlxGa1-xAs bajo efectos de presión hidrostática y temperatura

Diamagnetic susceptibility of bound exciton in cylindrical quantum nanodots under hydrostatic pressure and temperature effects

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