Mechanism of GaN quantum dot overgrowth by Al0.5Ga0.5N: Strain evolution and phase separation

2012 ◽  
Vol 111 (8) ◽  
pp. 084309 ◽  
Author(s):  
M. Korytov ◽  
J. A. Budagosky ◽  
J. Brault ◽  
T. Huault ◽  
M. Benaissa ◽  
...  
Keyword(s):  
Phase Separation ◽  
Quantum Dot ◽  
Strain Evolution

Large-Area Ordered Quantum-Dot Monolayers via Phase Separation During Spin-Casting

2005 ◽  
Vol 15 (7) ◽  
pp. 1117-1124 ◽  
Author(s):  
S. Coe-Sullivan ◽  
J. S. Steckel ◽  
W.-K. Woo ◽  
M. G. Bawendi ◽  
V. Bulović
Keyword(s):  
Phase Separation ◽  
Quantum Dot ◽  
Large Area ◽  
Spin Casting

Carrier relaxation mechanisms and Fermi versus non-Fermi carrier distribution in quantum dot arrays formed by activated alloy phase separation

2000 ◽  
Vol 11 (4) ◽  
pp. 309-313 ◽  
Author(s):  
M V Maximov ◽  
A F Tsatsul'nikov ◽  
D S Sizov ◽  
Yu M Shernyakov ◽  
A E Zhukov ◽  
...  
Keyword(s):  
Phase Separation ◽  
Quantum Dot ◽  
Carrier Distribution ◽  
Carrier Relaxation

Influence of functionalized side chains of polythiophene diblock copolymers on the performance of CdSe quantum dot hybrid solar cells

2017 ◽  
Vol 5 (6) ◽  
pp. 2473-2477 ◽  
Author(s):  
Chandima Bulumulla ◽  
Jia Du ◽  
Katherine E. Washington ◽  
Ruvanthi N. Kularatne ◽  
Hien Q. Nguyen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Quantum Dot ◽  
Functional Groups ◽  
Diblock Copolymers ◽  
Side Chains ◽  
Hybrid Solar Cells ◽  
Polymer Nanoparticle ◽  
Cdse Quantum Dot ◽  
Functionalized Side

The incorporation of functional groups into the side chains of polythiophenes can improve the phase separation of polymer : nanoparticle hybrid solar cells (HSCs).

New Tools to Control Morphology of Self-Organized Quantum Dot Nanostructures

2000 ◽  
Vol 618 ◽  
Author(s):  
V.A. Shchukina ◽  
N.N. Ledentsova ◽  
V.M. Ustinov ◽  
Yu.G. Musikhin ◽  
V.B. Volovik ◽  
...  
Keyword(s):  
Phase Separation ◽  
Quantum Dot ◽  
Electronic Spectra ◽  
Temperature Increase ◽  
Equilibrium Distribution ◽  
Growth Mode ◽  
Lateral Size ◽  
Capping Layer ◽  
Self Organized ◽  
Effects Of Temperature

ABSTRACTWe consider several approaches to control morphology of self-organized quantum dot (QD) nanostructures. (i) We study effects of temperature and of temperature ramping on formation of QD arrays. The theory of equilibrium distribution of island volumes is developed predicting an entropy-driven decrease of island volume at higher temperatures. Experiments on InAs/GaAs(001) obtained both at submonolayer deposition and in Stranski-Krastanow (SK) growth mode reveal the decrease of island volume with temperature increase that agrees with the thermodynamic picture of island formation. (ii) We show a reversibility of temperature-driven changes in island volume, shape, and density for SK InAs/GaAs(001) islands and a new possibility to control QDs. (iii) We consider an advanced way of formation of complex QD structures. For multisheet arrays of strained islands a transition between correlation and anticorrelation driven by the spacer thickness is predicted theoretically and confirmed experimentally. (iv) The overgrowth of InAs/GaAs islands by an InGa(Al)As alloy leads to alloy phase separation in the capping layer and an effective increase of both the lateral size and the height of the QDs. These complex growth approaches enable us to tune efficiently electronic spectra of the QD systems.

Tuning quantum dot properties by activated phase separation of an InGa(Al)As alloy grown on InAs stressors

2000 ◽  
Vol 62 (24) ◽  
pp. 16671-16680 ◽  
Author(s):  
M. V. Maximov ◽  
A. F. Tsatsul’nikov ◽  
B. V. Volovik ◽  
D. S. Sizov ◽  
Yu. M. Shernyakov ◽  
...  
Keyword(s):  
Phase Separation ◽  
Quantum Dot

One-dimensional Bi2O3 QD-decorated BiVO4 nanofibers: electrospinning synthesis, phase separation mechanism and enhanced photocatalytic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3767-3773 ◽  
Author(s):  
Chade Lv ◽  
Gang Chen ◽  
Jingxue Sun ◽  
Chunshuang Yan ◽  
Hongjun Dong ◽  
...  
Keyword(s):  
Phase Separation ◽  
Quantum Dot ◽  
Photocatalytic Performance ◽  
Separation Mechanism ◽  
One Dimensional ◽  
Photocatalytic Activities ◽  
Phase Separation Mechanism

In this work, we design and successfully fabricate novel Bi2O3 quantum dot (QD)-decorated BiVO4 nanofibers by electrospinning. Furthermore, it exhibits enhanced photocatalytic activities by promoting the separation of photoinduced electrons and holes.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

1994 ◽  
Vol 52 ◽  
pp. 646-647
Author(s):  
J. Tong ◽  
L. Eyring
Keyword(s):  
Fracture Toughness ◽  
Phase Separation ◽  
Sol Gel ◽  
Great Influence ◽  
High Strength ◽  
Chemical Durability ◽  
Separation Method ◽  
Toughening Mechanism ◽  
Ceramic Films ◽  
Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

Phase separation in fluid additive hard sphere mixtures?

1998 ◽  
Vol 95 (2) ◽  
pp. 131-135 ◽  
Author(s):  
DOUGLAS HENDERSON DEZSO BODA KWONG-YU CHAN
Keyword(s):  
Phase Separation ◽  
Hard Sphere
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