scholarly journals Quantum dots in the GaAs/AlxGa1−xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

2015 ◽  
Vol 107 (3) ◽  
pp. 033106 ◽  
Author(s):  
Luca Francaviglia ◽  
Yannik Fontana ◽  
Sonia Conesa-Boj ◽  
Gözde Tütüncüoglu ◽  
Léo Duchêne ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Thickness ◽  
Core Shell ◽  
Shell Nanowires

Crystal Phase Quantum Dots in the Ultrathin Core of GaAs–AlGaAs Core–Shell Nanowires

Nano Letters ◽  
2015 ◽  
Vol 15 (11) ◽  
pp. 7544-7551 ◽  
Author(s):  
Bernhard Loitsch ◽  
Julia Winnerl ◽  
Gianluca Grimaldi ◽  
Jakob Wierzbowski ◽  
Daniel Rudolph ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Crystal Phase ◽  
Core Shell ◽  
Shell Nanowires

scholarly journals Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

2014 ◽  
Vol 90 (7) ◽  
Author(s):  
Yannik Fontana ◽  
Pierre Corfdir ◽  
Barbara Van Hattem ◽  
Eleonora Russo-Averchi ◽  
Martin Heiss ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Self Assembled ◽  
Shell Nanowires

Solution-growth and optoelectronic properties of ZnO:Cl@ZnS core–shell nanowires with tunable shell thickness

2013 ◽  
Vol 555 ◽  
pp. 213-218 ◽  
Author(s):  
Jiandong Fan ◽  
Cristian Fábrega ◽  
Reza Zamani ◽  
Alexey Shavel ◽  
Frank Güell ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Optoelectronic Properties ◽  
Solution Growth ◽  
Core Shell ◽  
Shell Nanowires

scholarly journals Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

2020 ◽  
Vol 10 (18) ◽  
pp. 6282
Author(s):  
Muhammad Safwan Zaini ◽  
Josephine Ying Chyi Liew ◽  
Shahrul Ainliah Alang Ahmad ◽  
Abdul Rahman Mohmad ◽  
Mazliana Ahmad Kamarudin
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Quantum Confinement ◽  
Shell Thickness ◽  
Quantum Confinement Effect ◽  
Band Gap Energy ◽  
Confinement Effect ◽  
Core Shell ◽  
Lead Sulphide ◽  
Peak Energy

The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs.

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 Determination of the Optimal Shell Thickness for Self-Catalyzed GaAs/AlGaAs Core–Shell Nanowires on Silicon

Nano Letters ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 3426-3433 ◽  
Author(s):  
R. Songmuang ◽  
Le Thuy Thanh Giang ◽  
J. Bleuse ◽  
M. Den Hertog ◽  
Y. M. Niquet ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
Shell Nanowires

scholarly journals Exciton dynamics in GaAs/(Al,Ga)As core-shell nanowires with shell quantum dots

2016 ◽  
Vol 94 (15) ◽  
Author(s):  
Pierre Corfdir ◽  
Hanno Küpers ◽  
Ryan B. Lewis ◽  
Timur Flissikowski ◽  
Holger T. Grahn ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Exciton Dynamics ◽  
Shell Nanowires

scholarly journals Effects of shell thickness on the electric field dependence of exciton recombination in CdSe/CdS core/shell quantum dots

2017 ◽  
Vol 7 (6) ◽  
pp. 1871 ◽  
Author(s):  
Clare E. Rowland ◽  
Marc Currie ◽  
Kimihiro Susumu ◽  
Eunkeu Oh ◽  
Gary Kushto ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Field Dependence ◽  
Shell Thickness ◽  
Core Shell ◽  
Electric Field Dependence ◽  
Exciton Recombination
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