Excitons in type-II quantum dots: Finite offsets
U. E. H. Laheld, F. B. Pedersen, P. C. Hemmer
TL;DR
This paper investigates how quantum size effects influence exciton binding energies in type-II spherical quantum dots with finite band offsets, using a variational approach to analyze the dependence on dot size and material parameters.
Contribution
It introduces a variational method to calculate exciton energies in type-II quantum dots considering finite band offsets, highlighting the effects of dot size and effective masses.
Findings
Exciton binding energy varies with dot radius and band offsets.
Finite offsets significantly influence exciton properties in type-II quantum dots.
The model provides insights into size-dependent excitonic effects.
Abstract
Quantum size effects for an exciton attached to a spherical quantum dot are calculated by a variational approach. The band line-ups are assumed to be type-II with finite offsets. The dependence of the exciton binding energy upon the dot radius and the offsets is studied for different sets of electron and hole effective masses.
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