Abstract
Linear and nonlinear optical properties in colloidal CdSe/CdS core/shell quantum dots with different sizes have been theoretically investigated in the framework of effective mass approximation. The electron states in colloidal CdSe/CdS core/shell quantum dots have been calculated using the finite element method. The intraband linear and nonlinear absorption spectra have been calculated for colloidal CdSe/CdS core/shell quantum dots with different sizes. In addition, the dependences of the linear and nonlinear refractive index change on the incident light energy have been calculated. In the last section of the paper the second- and third-order harmonic generation spectra have been presented.
Highlights
Despite the fact that modern semiconductor nanotechnologies provide an opportunity to grow quantum dots (QDs) of different shapes and sizes, the methods of manufacturingQDs are expensive, require specialized equipment, and cannot provide sufficient volumes for industrial production [1,2,3]
Core/shell quantum dots have a number of advantages: the shell structure protects the core from environmental influences, enhances physical capabilities, or brings forth new ones, limits volumetric expansion, thereby preserving structural integrity, and prevents the formation of large particles in the core
The modified Pöschl–Teller potential was chosen as the model ically investigated
Summary
Despite the fact that modern semiconductor nanotechnologies provide an opportunity to grow quantum dots (QDs) of different shapes and sizes, the methods of manufacturingQDs are expensive, require specialized equipment, and cannot provide sufficient volumes for industrial production [1,2,3]. Despite the fact that modern semiconductor nanotechnologies provide an opportunity to grow quantum dots (QDs) of different shapes and sizes, the methods of manufacturing. The way out of this predicament was the introduction of the colloidal QD manufacturing process, which is carried out on the basis of solutions at low temperatures, and provides a unique opportunity for mass chemical synthesis and a narrow size distribution [4,5,6]. Among colloidal QDs, a special place is occupied by QDs with a core/shell structure. To obtain a core/shell structure, epitaxial layers of inorganic material (shell) are grown on the QD’s core material [12,13,14,15]. It should be noted that most of the properties of the core/shell QDs depend both on the core materials and the shell material
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