Impact of shell thickness on exciton and biexciton binding energies of a ZnSe/ZnS core–shell quantum dot

2010 ◽  
Vol 71 (9) ◽  
pp. 1201-1205 ◽  
Author(s):  
Pratima Sen ◽  
Saikat Chattopadhyay ◽  
Joseph Thomas Andrews ◽  
Pranay Kumar Sen
Keyword(s):  
Quantum Dot ◽  
Shell Thickness ◽  
Binding Energies ◽  
Core Shell

Effect of Magnetic Field and Shell Thickness on Binding Energies of a ZnSe/ZnS Core Shell Quantum Dot

2016 ◽  
Vol 46 (2) ◽  
pp. 967-970 ◽  
Author(s):  
Bashir Mohi ud din Bhat ◽  
Muhammad Shunaid Parvaiz ◽  
Pratima Sen
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Shell Thickness ◽  
Binding Energies ◽  
Core Shell

scholarly journals Effect of Shell and Shell Thickness on Photoluminescence (PL) of a CdSe/ZnS Core – Shell Quantum Dot

2012 ◽  
Vol 365 ◽  
pp. 012037 ◽  
Author(s):  
Saikat Chattopadhyay ◽  
Pratima Sen ◽  
J T Andrews ◽  
P K Sen
Keyword(s):  
Quantum Dot ◽  
Shell Thickness ◽  
Core Shell

scholarly journals Influence of Shell Thickness and Surface Passivation on PbS/CdS Core/Shell Colloidal Quantum Dot Solar Cells

2014 ◽  
Vol 26 (13) ◽  
pp. 4004-4013 ◽  
Author(s):  
Darren C. J. Neo ◽  
Cheng Cheng ◽  
Samuel D. Stranks ◽  
Simon M. Fairclough ◽  
Judy S. Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Shell Thickness ◽  
Surface Passivation ◽  
Core Shell ◽  
Quantum Dot Solar Cells ◽  
Colloidal Quantum Dot

Binding energies and photoionization cross-sections of donor and acceptor impurities in inverted core/shell ellipsoidal quantum dots: Effects of magnetic field, ellipsoid anisotropy and impurity position

2019 ◽  
Vol 33 (13) ◽  
pp. 1950131 ◽  
Author(s):  
Lei Shi ◽  
Zu-Wei Yan
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Cross Section ◽  
Cross Sections ◽  
Applied Magnetic Field ◽  
Photoionization Cross Section ◽  
Binding Energies ◽  
Core Shell ◽  
Perturbation Approach ◽  
Donor And Acceptor

Within the framework of the effective-mass approximation and by using a variational and perturbation approach, the binding energies and photoionization cross-sections of donor and acceptor impurities in an inverted core/shell ellipsoidal spherical quantum dot under an applied magnetic field have been studied. We have calculated the binding energies of both donor and acceptor impurities as a function of the core and shell sizes and shapes with different impurity positions under the applied magnetic field. In addition, the corresponding photoionization cross-section is calculated. Our results show that the binding energy of the acceptor impurity is larger than that of the donor impurity, and both of them with different impurity positions and quantum ellipsoid anisotropies will exhibit a nonmonotonic change. The peak value of the photoionization cross-section will reach a maximum with the increasing ratio R1/R2. It is found that the applied magnetic field can be an effective means of enhancing the photoionization cross-section of an impurity state in such core/shell quantum dot system.

Binding energies and photoionization cross-sections of donor impurities in GaN/AlxGa1−xN spherical quantum dot under hydrostatic pressure

2020 ◽  
Vol 34 (14) ◽  
pp. 2050153
Author(s):  
Shuo Li ◽  
Lei Shi ◽  
Zu-Wei Yan
Keyword(s):  
Hydrostatic Pressure ◽  
Binding Energy ◽  
Quantum Dot ◽  
Cross Section ◽  
Cross Sections ◽  
Photoionization Cross Section ◽  
Binding Energies ◽  
Core Shell ◽  
Core Size ◽  
Shell Size

In this paper, the binding energy and photoionization cross-section of donor impurity state in [Formula: see text] quantum dot structure are studied theoretically by using variational method. The variation of binding energy and photoionization cross-section with core and shell sizes at different impurity locations under hydrostatic pressure is calculated numerically. The results show that the binding energy decreases monotonously with the core size at different impurity locations for [Formula: see text] core/shell quantum dot. In contrast, for the inverted core/shell quantum dot, the binding energy exhibits different trends with the increase of core size at different impurity locations. But the binding energy decreases monotonically with the shell size for both of them. Moreover, when the photon energy is approximately equal to the donor binding energy, the peak of the photoionization cross-section appears. There will be different peak shifts under different conditions, and its peak intensity increases with the increase of core and shell sizes. When the hydrostatic pressure is applied, the binding energy and the peak strength of the photoionization cross-section increase with the increase of the pressure.

Illustrating the Shell Thickness Dependence in Alloyed Core/Shell Quantum-Dot-Based Light-Emitting Diodes by Impedance Spectroscopy

2019 ◽  
Vol 123 (42) ◽  
pp. 26011-26017 ◽  
Author(s):  
Ali Shmshad ◽  
Jialun Tang ◽  
Imran Muhammad ◽  
Dengbao Han ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Quantum Dot ◽  
Shell Thickness ◽  
Light Emitting Diodes ◽  
Thickness Dependence ◽  
Core Shell ◽  
Light Emitting
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