scholarly journals Production of three-dimensional quantum dot lattice of Ge/Si core–shell quantum dots and Si/Ge layers in an alumina glass matrix

2015 ◽  
Vol 26 (6) ◽  
pp. 065602 ◽  
Author(s):  
M Buljan ◽  
N Radić ◽  
J Sancho-Paramon ◽  
V Janicki ◽  
J Grenzer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Glass Matrix ◽  
Three Dimensional ◽  
Core Shell

scholarly journals Evaluation of CdTe/CdS/ZnS core/shell/shell quantum dot toxicity on three-dimensional spheroid cultures

2016 ◽  
Vol 5 (1) ◽  
pp. 126-135 ◽  
Author(s):  
Mehriban Ulusoy ◽  
Antonina Lavrentieva ◽  
Johanna-Gabriela Walter ◽  
Franziska Sambale ◽  
Mark Green ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Three Dimensional ◽  
Core Shell ◽  
Tissue Structures ◽  
Cytotoxicity Effects ◽  
Dose Dependent

Three-dimensional hAD-MSCs spheroid cultures, with the ability to resemble closely in vivo tissue structures, were assessed for evaluation of dose-dependent cytotoxicity effects of CdTe/CdS/ZnS quantum dots.

Preparation of photostable near-infrared luminescent glass with quantum dot-layered double hydroxide composites

2016 ◽  
Vol 4 (37) ◽  
pp. 8624-8627 ◽  
Author(s):  
Sanghwa Jeong ◽  
Hong Nam Nguyen ◽  
Sekyu Hwang ◽  
Beomsoo Kim ◽  
Jong Heo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Layered Double Hydroxide ◽  
Glass Matrix ◽  
Near Infrared ◽  
Core Shell ◽  
Arsenic Sulfide ◽  
Sulfide Glass ◽  
Double Hydroxide

A nanocomposite from near-infrared emitting PbS/CdS core/shell quantum dots and a layered double hydroxide nanoclay was incorporated into an arsenic sulfide glass to represent a highly bright and photostable glass matrix.

Core–shell ZnSe–CdSe quantum dots: a facile approach via decomposition of cyclohexeno-1,2,3-selenadiazole

RSC Advances ◽  
2014 ◽  
Vol 4 (34) ◽  
pp. 17526-17532 ◽  
Author(s):  
Sreenu Bhanoth ◽  
Priyesh V. More ◽  
Aditi Jadhav ◽  
Pawan K. Khanna
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Synthesis Method ◽  
Core Shell ◽  
Cdse Quantum Dots ◽  
First Time

For the first time ever cyclohexeno-1,2,3-selenadiazole (SDZ) has been employed for the synthesis of core–shell ZnSe–CdSe quantum dots thus promoting an eco-friendly and reasonably less toxic synthesis method for such quantum dot hetero-structures.

scholarly journals Simple and Multi-layered Quantum dot in various structures

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Manu Mitra
Keyword(s):  
Quantum Dots ◽  
Wave Function ◽  
Optical Properties ◽  
Quantum Dot ◽  
Three Dimensional ◽  
Polarized Light ◽  
High Peak ◽  
Different Color ◽  
Incoming Light ◽  
Dimensional Wave

Abstract: Quantum dots have interesting optical properties. They absorb incoming light of one color and emit out light of a completely different color. This research paper discloses eigen states of a simple and multilayer quantum dot in various structures for cuboid, cylinder, dome, cone, and pyramid, and its three-dimensional wave function, energy states, light and dark transitions (X-polarized), light and dark transitions (Y-polarized), light and dark transitions (Zpolarized), light and dark transitions (phi = 0 and theta= 45), absorption (phi = 0 and theta = 45), absorption sweep of angle theta, and integrated absorption are plotted and the observations of high peak values are noted and documented.

Structure evolution from CdSSe alloy to CdS/CdSe core/shell for Cd(S, Se) composite quantum dots and its impact on the performance of sensitized solar cell

2021 ◽  
Author(s):  
Junfei Fang ◽  
Wenlei Lv ◽  
Yilong Lei ◽  
Jianping Deng ◽  
Pengchao Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Quantum Dot ◽  
Structure Evolution ◽  
Core Shell ◽  
Cdse Core

CdSSe alloy and CdS/CdSe core/shell quantum dots (QDs) are widely studied in quantum dot solar cell (QDSSCs). However, up to date, there have been no detailed comparative investigations on the cell...

Investigation of the Electron Energy Spectrum in a Three Dimensional Regimented Tetragonal Quantum Dot Superlattice

2001 ◽  
Vol 677 ◽  
Author(s):  
Olga L. Lazarenkova ◽  
Alexander A. Balandin
Keyword(s):  
Quantum Dots ◽  
Energy Spectrum ◽  
Quantum Dot ◽  
Electron Energy ◽  
Electronic Band Structure ◽  
Three Dimensional ◽  
Electron Energy Spectrum ◽  
Real Crystal ◽  
Electronic Band ◽  
Gaas Quantum Dot

ABSTRACTWe analyze the electron energy spectrum in three-dimensional regimented arrays of semiconductor quantum dots. The coupling among quantum dots results in formation of three- dimensional electron mini-bands. Changing the size of quantum dots, inter-dot distance, barrier height and regimentation, one can control the electronic band structure of this quantum dot superlattice, which can also be referred to as quantum dot crystal due to its structure and energy spectrum that resemble those of a real crystal. Results of computer simulations carried out for a tetragonal InAs/GaAs quantum dot superlattice show that the electron density of states, effective mass tensor and other properties are different from those of bulk and conventional quantum well superlattices.

Internal Atomic-Scale Structure Determination and Band Alignment of II-VI Quantum Dot Heterostructures

2019 ◽  
Author(s):  
Cecilia Gentle ◽  
Yuanheng Wang ◽  
Tyler N. Haddock ◽  
Conner P. Dykstra ◽  
Renske M. van der Veen
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Absorption Spectroscopy ◽  
Shell Structure ◽  
Electronic Band Structure ◽  
Band Alignment ◽  
Atomic Scale ◽  
Core Shell ◽  
Cdse Core ◽  
Electronic Band

<p>This work shows that ZnTe/CdSe core/shell quantum dots synthesized by standard literature procedures in actuality have an alloyed Cd<sup>­</sup><sub>x</sub>Zn<sub>1-x</sub>Te core. We employ X-ray absorption spectroscopy (XAS) at all four <i>K</i>-shell ionization edges (Zn, Te, Cd, Se) and perform a global fitting analysis in order to extract the first-shell bond distances. We combine our XAS results with transmission electron microscopy (TEM) sizing and elemental analyses, which allows us to propose models of the internal particle structure. Our multimodal characterization approach confirms <b>(1) </b>the presence of Cd-Te bonds, <b>(2) </b>cation<b> </b>alloying in the particle core (and the absence of anion alloying), and <b>(3) </b>a patchy pure-phase CdSe shell. We synthesize particles of different shell thicknesses and performed synthetic control studies that allowed us to discard a ZnTe/CdTe/CdSe core/shell/shell structure and confirm the alloyed core/shell structure. Our structural analysis is extended with electronic band structure calculations and UV/vis absorption spectroscopy, demonstrating that the alloyed Cd<sup>­</sup><sub>x</sub>Zn<sub>1-x</sub>Te/CdSe core/shell quantum dots exhibit a direct band gap, different from the predicted type-II band alignment of the intended ZnTe/CdSe core/shell quantum dots. This study highlights the challenges with synthesizing II-VI quantum dot heterostructures and the power of XAS for understanding the internal structure of heterogenous nanoparticles.</p>

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