Confinement effects and tunability of quantum dots within strong confinement regime

Sultana, Sadia; Alam, Md. Shah

doi:10.1109/wiecon-ece.2015.7443961

Cited by 4 publications

(1 citation statement)

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“…A detailed analysis of the energy levels of QDs is required, as these determine the optoelectronic characteristics. Quantum confinement effects modulate QD energy levels and luminescence properties [ 15 , 16 ]. In addition, the quantum-confined Stark effect (QCSE) [ 17 , 18 ] arising from the voltage bias influences the electroluminescence properties of QDs.…”

Section: Introductionmentioning

confidence: 99%

Quantum Mechanical Analysis Based on Perturbation Theory of CdSe/ZnS Quantum-Dot Light-Emission Properties

Lee

Kim

2022

Nanomaterials

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A simulation of quantum dot (QD) energy levels was designed to reproduce a quantum mechanical analytic method based on perturbation theory. A Schrödinger equation describing an electron–hole pair in a QD was solved, in consideration of the heterogeneity of the material parameters of the core and shell. The equation was solved numerically using single-particle basis sets to obtain the eigenstates and energies. This approach reproduced an analytic solution based on perturbation theory, while the calculation was performed using a numerical method. Owing to the effectiveness of the method, QD behavior according to the core diameter and external electric field intensity could be investigated reliably and easily. A 9.2 nm diameter CdSe/ZnS QD with a 4.2 nm diameter core and 2.5 nm thick shell emitted a 530 nm green light, according to an analysis of the effects of core diameter on energy levels. A 4 nm redshift at V/cm electric field intensity was found while investigating the effects of external electric field on energy levels. These values agree well with previously reported experimental results. In addition to the energy levels and light emission wavelengths, the spatial distributions of wavefunctions were obtained. This analysis method is widely applicable for studying QD characteristics with varying structure and material compositions and should aid the development of high-performance QD technologies.

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