Modeling of electronic structure for dome-shaped quantum dots

Abstract

A Hamiltonian operator in assessing the energy levels and wavefunctions of quantum dots (QDs) was proposed. The finite element method was used to solve the numerical Schrödinger equation for envelope function in the effective mass approximation. Within this model, we have investigated QDs with different geometries (cone, lens and dome-shaped dot). While it is easy to attain stability for conical QDs, it is difficult with lens QDs. Strain and mole-fraction effects are also studied. Our results coincide with the experimental one.

Calculation of threshold current density and efficiency for multiple quantum wire of 〖Hg〗_(0.5) 〖Cd〗_(0.5) Te/〖Hg〗_(0.8) 〖Cd〗_(0.2) Te/CdTe laser

“…This equation also considers the confinement factor by replacing with . It is seen here in order to reduce the threshold current density, one can increase and to reduce d and , achieving low threshold current is one of the main goals in laser development [4].…”

“…For semiconductor-device applications, the difference in energy gap provides another degree of freedom that produces many interesting phenomena. Heterojunctions have been widely used in various device applications [4]. The improved performance of (QW) laser diode with respect to equivalent bulk heterostructure devices led to the consideration of lowerdimensional structure, e.g.…”

Charge transfer in copper oxide nanostructure

“…There are limited research results exploring the influence of various applied potentials to the conductive electrode on which the Copper (i) oxide is electro-plated. Cu2O was electrodeposited on different substrates and studied the growth of crystal and their effects on Photo-electrochemical characteristics [8]. Variation in Electrodeposition potential and current change the shape, size, morphology and orientation of thin films which may result variation in geometrical, optical, electrical and photo-conductivity properties.…”

Characterization of nickel sulfide and zinc sulfide nanostructures

“…Solar and wind energy are the natural and major renewable resources of energy but cannot supply energy continuously. When we consider the electrical energy storage devices (ESDs), cutting edge devices are using electrochemical capacitors (ECs), batteries, and supercapacitors (SCs) [1][2][3]. SCs and energy storage devices have been found very interesting due to their higher reliability and power density, fast charge-discharge rates, long lifetime, and more environment compatibility, compared with the rechargeable batteries.…”