Correlation Between GaInAsSb Surface Step Structure and Phase Separation

1999 ◽  
Vol 607 ◽  
Author(s):  
C.A. WANG
Keyword(s):  
Phase Separation ◽  
Quantitative Measure ◽  
Organometallic Vapor Phase Epitaxy ◽  
Full Width ◽  
Vicinal Surface ◽  
Lower Growth ◽  
Surface Step ◽  
Step Structure ◽  
Peak Energy ◽  
Lower Growth Temperature

AbstractA strong correlation between the surface step structure and phase separation in metastable GaInAsSb epitaxial layers grown by organometallic vapor phase epitaxy has been identified. The full width at half maximum (FWHM) of 4-K photoluminescence (PL) peak energy is used as a semi-quantitative measure of the degree of phase separation. The step structure of GaInAsSb grown at 525 °C is vicinal, while it is step-bunched for layers grown at 575 °C. The corresponding 4-K PL FWHM data indicate that the degree of phase separation is minimized when the layers aregrown at the lower growth temperature. It is proposed that the longer terrace lengths of a step-bunched surface are associated with a longer adatom lifetime compared to a vicinal surface, and thus the adatoms have more time to cluster and phase separate, which is the preferred equilibrium state. Increasing the growth rate, which reduces the adatom lifetime, also reduces the PL FWHM, and thus, the degree of phase separation.

HETERO-GROWTH OF (100) ORIENTATED ZNO FILMS ON SILICON BY SS-CVD

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4250-4254 ◽  
Author(s):  
JIAN-GUO LU ◽  
ZHI-ZHEN YE ◽  
HAN-HONG CHEN ◽  
JING-YUN HUANG ◽  
BING-HUI ZHAO
Keyword(s):  
Texture Coefficient ◽  
Zinc Acetate Dihydrate ◽  
Chemical Vapor ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Lower Growth ◽  
Force Microscopy ◽  
Atomic Force ◽  
First Time ◽  
Lower Growth Temperature

ZnO films with (100) preferred orientation are reported for the first time. ZnO films were synthesized on Si(100) substrate by solid-source chemical vapor deposition (SS-CVD) using zinc acetate dihydrate (solid) as a precursor. The structural properties were investigated by X-ray diffraction and atomic force microscopy. Results show that a lower growth temperature and a higher deposition rate will facilitate the formation of (100) texture. The texture coefficient for (100) plane is 3.28.

Development of LPE process for fabrication of coated conductors

2000 ◽  
Vol 659 ◽  
Author(s):  
Teruo Izumi ◽  
Natsuro Hobara ◽  
Toru Izumi ◽  
Katsuya Hasegawa ◽  
Masahiko Kai ◽  
...  
Keyword(s):  
Growth Temperature ◽  
Recent Progress ◽  
High Growth ◽  
High Growth Rate ◽  
Coated Conductors ◽  
The Other ◽  
Lower Growth ◽  
The Difference ◽  
Lower Growth Temperature ◽  
Selection Of

ABSTRACTRecent Progress of development for coated conductors by the LPE technique was reviewed. Double layered LPE films were applied to the growth on metal substrates. In both cases of MgO- and NiO- buffers, the constructions were succeeded to grow on Hastelloy and Ni tapes, respectively. In the case of the MgO-buffer, the problem, which is the melting back of the 1st LPE layer during dipping for the growth of the 2nd LPE layer, was found. The problem was solved by means of the selection of the materials for each LPE layer to introduce the difference in the growth temperature for the 1st and the 2nd layers. The lower growth temperature for the 1st LPE layer than that for 2nd one is effective to avoid the problem. On the other hand, the double layered LPE films on Ni tapes revealed Tc of 85K. Concerning the long tape processing, the high growth rate of 1≈ was confirmed even without rotation using the long tape apparatus.

Surface step structure of a lens-shaped Si(001) vicinal substrate

1989 ◽  
Vol 183 (1-2) ◽  
pp. 229-233 ◽  
Author(s):  
Kunihiro Sakamoto ◽  
Kazushi Miki ◽  
Tsunenori Sakamoto
Keyword(s):  
Surface Step ◽  
Step Structure ◽  
Vicinal Substrate

Isoelectronic surfactant-induced surface step structure and correlation with ordering in GaInP

2002 ◽  
Vol 235 (1-4) ◽  
pp. 15-24 ◽  
Author(s):  
S.W. Jun ◽  
G.B. Stringfellow ◽  
J.K. Shurtleff ◽  
R.-T. Lee
Keyword(s):  
Surface Step ◽  
Step Structure

scholarly journals Three archetypical classes of macromolecular regulators of protein liquid–liquid phase separation

2019 ◽  
Vol 116 (39) ◽  
pp. 19474-19483 ◽  
Author(s):  
Archishman Ghosh ◽  
Konstantinos Mazarakos ◽  
Huan-Xiang Zhou
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Computational Study ◽  
Quantitative Measure ◽  
Liquid Phase Separation ◽  
Wide Range ◽  
Regulatory Effects ◽  
High Concentrations ◽  
Droplet Phase ◽  
Liquid Liquid Phase Separation

Membraneless organelles, corresponding to the droplet phase upon liquid–liquid phase separation (LLPS) of protein or protein–RNA mixtures, mediate myriad cellular functions. Cells use a variety of biochemical signals such as expression level and posttranslational modification to regulate droplet formation and dissolution, but the physical basis of the regulatory mechanisms remains ill-defined and quantitative assessment of the effects is largely lacking. Our computational study predicted that the strength of attraction by droplet-forming proteins dictates whether and how macromolecular regulators promote or suppress LLPS. We experimentally tested this prediction, using the pentamers of SH3 domains and proline-rich motifs (SH35 and PRM5) as droplet-forming proteins. Determination of the changes in phase boundary and the partition coefficients in the droplet phase over a wide range of regulator concentrations yielded both a quantitative measure and a mechanistic understanding of the regulatory effects. Three archetypical classes of regulatory effects were observed. Ficoll 70 at high concentrations indirectly promoted SH35–PRM5 LLPS, by taking up volume in the bulk phase and thereby displacing SH35 and PRM5 into the droplet phase. Lysozyme had a moderate partition coefficient and suppressed LLPS by substituting weaker attraction with SH35 for the stronger SH35–PRM5 attraction in the droplet phase. By forming even stronger attraction with PRM5, heparin at low concentrations partitioned heavily into the droplet phase and promoted LLPS. These characteristics were recapitulated by computational results of patchy particle models, validating the identification of the 3 classes of macromolecular regulators as volume-exclusion promotors, weak-attraction suppressors, and strong-attraction promotors.

LPE Growth of Textured KNbO3 Film Using SrTiO3 Substrate and V2O5 Flux

2006 ◽  
Vol 11-12 ◽  
pp. 109-112
Author(s):  
T. Hibino ◽  
Kenichi Kakimoto ◽  
Hitoshi Ohsato
Keyword(s):  
Thin Films ◽  
Phase Diagram ◽  
Growth Rate ◽  
Liquid Phase ◽  
Surface Morphology ◽  
Liquid Phase Epitaxy ◽  
Growth Temperature ◽  
Film Growth ◽  
Lower Growth ◽  
Lower Growth Temperature

KNbO3 thin films were grown on (100) and (110) SrTiO3 substrates by liquid phase epitaxy (LPE) technique. The film orientation and surface morphology were characterized by XRD and AFM, respectively. The limited phase diagram of K2O-Nb2O5-V2O5 system was prepared by DTA measurement to investigate the effect of V2O5 flux on the LPE growth of KNbO3 film. The use of V2O5 flux enhanced a film growth rate at lower growth temperature.

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