Shell-Thickness-Dependent Biexciton Lifetime in Type I and Quasi-Type II CdSe@CdS Core/Shell Quantum Dots

2018 ◽  
Vol 122 (25) ◽  
pp. 14091-14098 ◽  
Author(s):  
Degui Kong ◽  
Yanyan Jia ◽  
Yueping Ren ◽  
Zhaoxiong Xie ◽  
Kaifeng Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Thickness ◽  
Core Shell ◽  
Type I ◽  
Type Ii

Interfacial strain effect on type-I and type-II core/shell quantum dots

2016 ◽  
Vol 97 ◽  
pp. 489-494 ◽  
Author(s):  
Negar Gheshlaghi ◽  
Hadi Sedaghat Pisheh ◽  
M. Rezaul Karim ◽  
Derya Malkoc ◽  
Hilmi Ünlü
Keyword(s):  
Quantum Dots ◽  
Strain Effect ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Interfacial Strain

Interband Optical Transition Energies in Type-II PbSe/PbS Core/Shell Quantum Dots

2017 ◽  
Vol 6 (1) ◽  
pp. 80-86
Author(s):  
S. N. Saravanamoorthy ◽  
A. John Peter
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Shell Thickness ◽  
Optical Transition ◽  
Hole Pair ◽  
Core Shell ◽  
Type Ii ◽  
Electron Hole ◽  
Transition Energies ◽  
Electron Hole Pair

Electronic and optical properties of Type-II lead based core/shell semiconducting quantum dots are reported. Binding energies of electron–hole pair, optical transition energies and the absorption coefficients are investigated taking into account the geometrical confinement in PbSe/PbS core/shell quantum dot nanostructure. The energies are obtained with the increase of shell thickness for various inner core radii. The probability densities of electron and hole wave functions of radial coordinate of the core PbSe and PbS shell quantum dots are presented. The optical transition energy with the spatial confinement is brought out. The electronic properties are obtained using variational approach whereas the compact density matrix method is employed for the nonlinear optical properties. The results show that (i) a decrease in binding energy is obtained when the shell thickness increases due to more separation of electron–hole pair and (ii) the energy band gap decreases with the increase in the shell thickness resulting in the reduction of the higher energy interband transitions.

scholarly journals Enhancing photo-reduction quantum efficiency using quasi-type II core/shell quantum dots

2016 ◽  
Vol 7 (7) ◽  
pp. 4125-4133 ◽  
Author(s):  
Yanyan Jia ◽  
Jinquan Chen ◽  
Kaifeng Wu ◽  
Alex Kaledin ◽  
Djamaladdin G. Musaev ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Quantum Efficiency ◽  
Shell Thickness ◽  
Removal Rate ◽  
Core Shell ◽  
Type Ii ◽  
Fast Increase

Enhancing photoreduction quantum yield in core/shell QDs through an unexpectedly fast increase of hole removal rate with shell thickness.

Synthesis of Type-I CdTe Core and Type-II CdTe/CdS Core/Shell Quantum Dots by a Hydrothermal Method and Their Optical Properties

2017 ◽  
Vol 90 (1) ◽  
pp. 52-58 ◽  
Author(s):  
Taichi Watanabe ◽  
Kohji Takahashi ◽  
Kunio Shimura ◽  
Hang-Beom Bu ◽  
Kim Hyeon-Deuk ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Hydrothermal Method ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Cdte Core

scholarly journals Interface Strain Effects on ZnSe/ (CdSe) based Type I and ZnSe/CdS Type II Core/Shell Quantum Dots

2016 ◽  
Vol 102 ◽  
pp. 152-163 ◽  
Author(s):  
Negar Gheshlaghi ◽  
Hadi Sedaghat Pisheh ◽  
M. Rezaul Karim ◽  
Hilmi Ünlü
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Type I ◽  
Type Ii ◽  
Strain Effects ◽  
Interface Strain
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