Finite confinement potentials, core and shell size effects on excitonic and electron-atom properties in cylindrical...

Area of Science:

• Quantum dots
• Nanomaterials science
• Condensed matter physics

Background:

• Cylindrical core/shell/shell quantum dots (CSSQDs) are crucial in nanomaterials.
• Understanding charge carrier confinement is key to their electronic and optical properties.
• Finite confinement potential models are essential for accurate theoretical descriptions.

Purpose of the Study:

• To investigate the effects of structural parameters and confinement potentials on electron, donor atom, and exciton confinement in CSSQDs.
• To analyze the influence of core size, shell thickness, and barrier material potentials.
• To explore the transition between different confinement systems (Type-A and Type-B).

Main Methods:

• Solving the 3D time-independent Schrödinger equation within effective mass and parabolic band approximations.
• Utilizing the variational technique to determine ground-state quasiparticle energies.
• Employing the finite confinement potential model for barrier materials.

Main Results:

• Electron, donor atom, and exciton energies are highly sensitive to core radius, shell thickness, and confinement potentials.
• The first material's confinement potential has a more significant effect with larger thickness and smaller core radius.
• Donor atom binding energy is generally stronger than exciton binding energy.

Conclusions:

• Structural parameters and confinement potentials are critical for tailoring electronic and excitonic properties in CSSQDs.
• The study demonstrates a transition between Type-A and Type-B confinement systems.
• Findings provide a basis for designing advanced nanomaterials with specific optoelectronic characteristics.