Strain Influence on Optical Absorption of Giant Semiconductor Colloidal Quantum Dots

TL;DR

This paper models how strain affects the energy structure and optical absorption in large core/multishell spherical semiconductor quantum dots, highlighting the role of carrier localization in optical stability.

Contribution

It introduces a linear elasticity model to analyze strain effects on optical properties of large core/multishell quantum dots, emphasizing carrier localization's impact.

Findings

Strain influences the energy structure and absorption in quantum dots.

Carrier localization contributes to optical stability.

Modeling explains experimental stability observations.

Abstract

The lattice mismatch strain field of core/multishell structures with spherical symmetry is modeled by a linear continuum elasticity approach. The effect of the strain on the energy structure and linear optical absorption in large core/shell/shell spherical semiconductor quantum dots is analyzed. Localization of the photoexcited carriers induced by coating is found to play an important role in explaining the optical stability of large CdSe/CdS/ZnS and ZnTe/ZnSe/ZnS quantum dots.