Effects of Sb/As intermixing on optical properties of GaSb type-II quantum dots in GaAs grown by droplet epitaxy

2010 ◽  
Vol 97 (26) ◽  
pp. 261906 ◽  
Author(s):  
Takuya Kawazu ◽  
Hiroyuki Sakaki
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Droplet Epitaxy ◽  
Type Ii

Type-II GaSb/GaAs Nanostructures Grown by Droplet Epitaxy with Various Ga Amounts

2015 ◽  
Vol 1131 ◽  
pp. 60-63 ◽  
Author(s):  
Maetee Kunrugsa ◽  
Somsak Panyakeow ◽  
Somchai Ratanathammaphan
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Optical Properties ◽  
Droplet Epitaxy ◽  
Formation Mechanisms ◽  
Type Ii ◽  
Quantum Rings ◽  
Force Microscopy ◽  
Atomic Force

We study the GaSb/GaAs nanostructures (NSs) grown by droplet epitaxy technique with various Ga amounts. Ga amount deposited on the GaAs (001) substrate was varied between 3-5 ML to form the different size and density of liquid Ga droplets. The Sb flux was subsequently irradiated to crystallize the droplets. Morphology of GaSb NSs was investigated by atomic force microscopy (AFM). Quantum rings were obtained after crystallizing 3-ML Ga droplets, whereas some kind of quantum dots were formed after crystallizing 4-and 5-ML Ga droplets. The formation mechanisms leading to the different structure are discussed. The photoluminescence (PL) measurement was performed to examine the optical properties of GaSb/GaAs NSs.

scholarly journals Ultrafast optical properties of type-II CdZnS/ZnSe core-shell quantum dots

2018 ◽  
Vol 26 (14) ◽  
pp. 18480 ◽  
Author(s):  
Lingling Ran ◽  
Haiyang Li ◽  
Wenzhi Wu ◽  
Yachen Gao ◽  
Zhijun Chai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Core Shell ◽  
Type Ii ◽  
Ultrafast Optical

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.

GaSb/GaAs type-II quantum dots grown by droplet epitaxy

2009 ◽  
Vol 20 (45) ◽  
pp. 455604 ◽  
Author(s):  
Baolai Liang ◽  
Andrew Lin ◽  
Nicola Pavarelli ◽  
Charles Reyner ◽  
Jun Tatebayashi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Droplet Epitaxy ◽  
Type Ii

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

Optical properties of multi-layer type II InP/GaAs quantum dots studied by surface photovoltage spectroscopy

2011 ◽  
Vol 110 (6) ◽  
pp. 064302 ◽  
Author(s):  
Ts. Ivanov ◽  
V. Donchev ◽  
K. Germanova ◽  
P. F. Gomes ◽  
F. Iikawa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Photovoltage ◽  
Type Ii ◽  
Surface Photovoltage Spectroscopy
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