Heat-Resistant Barrier Contacts Made on the Basis of TiBx and ZrBx to SiC and GaN

2009 ◽  
Vol 615-617 ◽  
pp. 565-568 ◽  
Author(s):  
Alexander A. Lebedev ◽  
A.E. Belyaev ◽  
N.S. Boltovets ◽  
V.N. Ivanov ◽  
Raisa V. Konakova ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Phase Composition ◽  
Heat Resistance ◽  
Contact Structure ◽  
Schottky Barriers ◽  
Electrophysical Properties ◽  
Depth Profiles ◽  
Contact Metallization ◽  
Before And After ◽  
Concentration Depth Profiles

We studied the heat resistance of AuTiBx (ZrBx) barrier contacts to n-SiC 6H and n-GaN. The Schottky barrier diode (SBD) parameters, the concentration depth profiles for contact structure components and the phase composition of contact metallization were measured both before and after rapid thermal annealing (RTA) at temperatures up to 900 °С (1000 °С) for contacts to GaN (SiC 6H). It is shown that the layered structure of metallization and electrophysical properties of Schottky barriers (SBs) remain stable after RTA, thus indicating their heat resistance. The ideality factor n of the I-V characteristic of SBDs after RTA was 1.2, while the SB height φВ was ~0.9 eV (~0.8 eV) for the gallium nitride (silicon carbide) barrier structures.

Parameters for Nitrogen Diffusion in Ni, Ti, and Al Obtained from Implanted Bilayers

1992 ◽  
Vol 279 ◽  
Author(s):  
K. K. Bourdelle ◽  
D. O. Boerma
Keyword(s):  
Nuclear Reaction ◽  
Room Temperature ◽  
Vacuum Annealing ◽  
Nitride Layer ◽  
Nuclear Reaction Analysis ◽  
Nitrogen Diffusion ◽  
Depth Profiles ◽  
Solid Interface ◽  
Before And After ◽  
Concentration Depth Profiles

ABSTRACTNi foils and samples consisting of bilayers of Ni or Fe on Al, Ti or Si were implanted at room temperature with 15N+ ions to fluences of around 1×l017 N/cm2. The concentration depth profiles of 15N were determined with nuclear reaction analysis before and after vacuum annealing. It was found that the penetrability for N atoms of the surface and the solid/solid interface plays an important role in the N redistribution during implantation or annealing. The formation of a nitride layer or nitride clusters in Ni and Fe was deduced. Parameters for N migration determined for the metals under investigation are discussed in terms of models.

Electrophysical and Optical Properties of 4H-SiC UV Detectors Irradiated with Electrons

2019 ◽  
Vol 963 ◽  
pp. 722-725 ◽  
Author(s):  
Evgenia V. Kalinina ◽  
Alexander A. Lebedev ◽  
Vitalii V. Kozlovski ◽  
V.V. Zabrodskiy ◽  
Anatoly M. Strel'chuk ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ultraviolet Radiation ◽  
Spectral Sensitivity ◽  
Spectral Range ◽  
Comparative Studies ◽  
Schottky Barriers ◽  
Electrophysical Properties ◽  
Uv Detectors ◽  
Before And After ◽  
20 Nm

Comparative studies of the structural, electrophysical properties and spectral sensitivity of 4H-SiC photodetectors of ultraviolet radiation in the spectral range of 200-400 nm were carried out before and after electron irradiations. Photodetectors with Cr Schottky barriers with thickness of 20 nm and 8 mm diameter were formed on n-4H-SiC CVD epitaxial layers with a thickness of 5 μm and concentration Nd-Na= (1-4) х1014 cm-3. Cr/4H-SiC photodiodes were irradiated by electrons at 0.9 MeV energy with doses (0.2-1) x1016 cm-2.

High thermal conductivity of pure dense SiC ceramics prepared via HTPVT

2019 ◽  
Vol 12 (03) ◽  
pp. 1950032 ◽  
Author(s):  
Yuchen Deng ◽  
Yaming Zhang ◽  
Nanlong Zhang ◽  
Qiang Zhi ◽  
Bo Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Grain Size ◽  
Phase Composition ◽  
Room Temperature ◽  
Vapor Transport ◽  
Physical Vapor Transport ◽  
Growth Substrate ◽  
Sic Ceramics ◽  
Evolution Of Microstructure

Pure dense silicon carbide (SiC) ceramics were obtained via the high-temperature physical vapor transport (HTPVT) method using graphite paper as the growth substrate. The phase composition, the evolution of microstructure, the thermal diffusivity and thermal conductivity at RT to 200∘C were investigated. The obtained samples had a relative density of higher than 98.7% and a large grain size of 1[Formula: see text]mm, the samples also had a room-temperature thermal conductivity of [Formula: see text] and with the temperature increased to 200∘C, the thermal conductivity still maintained at [Formula: see text].

Microstructure and Mechanical Properties of Ti-6Al-4V Manufactured by SLM

2015 ◽  
Vol 651-653 ◽  
pp. 677-682 ◽  
Author(s):  
Anatoliy Popovich ◽  
Vadim Sufiiarov ◽  
Evgenii Borisov ◽  
Igor Polozov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Behavior ◽  
Ductile Fracture ◽  
Elevated Temperatures ◽  
Initial Material ◽  
Laser Melting ◽  
Microstructure And Mechanical Properties ◽  
Before And After

The article presents results of a study of phase composition and microstructure of initial material and samples obtained by selective laser melting of titanium-based alloy, as well as samples after heat treatment. The effect of heat treatment on microstructure and mechanical properties of specimens was shown. It was studied mechanical behavior of manufactured specimens before and after heat treatment at room and elevated temperatures as well. The heat treatment allows obtaining sufficient mechanical properties of material at room and elevated temperatures such as increase in ductility of material. The fractography of samples showed that they feature ductile fracture with brittle elements.

Hg1−x−yCdxZnyTe: Growth, Properties and Potential for Infrared Detector Applications

1986 ◽  
Vol 90 ◽  
Author(s):  
Debra L. Kaiser ◽  
Piotr Becla
Keyword(s):  
Carrier Concentration ◽  
Vapor Phase ◽  
Infrared Detector ◽  
Vapor Phase Epitaxy ◽  
Diffusion Method ◽  
Depth Profiles ◽  
Growth Properties ◽  
Concentration Depth Profiles

ABSTRACTClose-spaced isothermal vapor phase epitaxy (VPE) was used to grow quaternary Hg1−x−yCdxZnyTe epillayers on Cd1−zZnzTe substrates. Composition, resistivity, and carrier concentration depth profiles were determined in the epilayers. p-n junctions were produced from material with appropriate properties using the Hg diffusion method. The junctions showed excellent I-V characteristics and high spectral detectivities.

Concentration Depth Profiles of Microplastic Particles in River Flow and Implications for Surface Sampling

2021 ◽  
Vol 55 (9) ◽  
pp. 6032-6041
Author(s):  
Win Cowger ◽  
Andrew B. Gray ◽  
James J. Guilinger ◽  
Brandon Fong ◽  
Kryss Waldschläger
Keyword(s):  
River Flow ◽  
Surface Sampling ◽  
Depth Profiles ◽  
Concentration Depth Profiles

Assessment of biofilm changes and concentration-depth profiles during arsenopyrite oxidation by Acidithiobacillus thiooxidans

2017 ◽  
Vol 24 (24) ◽  
pp. 20082-20092 ◽  
Author(s):  
Hugo Ramírez-Aldaba ◽  
Jorge Vazquez-Arenas ◽  
Fabiola S. Sosa-Rodríguez ◽  
Donato Valdez-Pérez ◽  
Estela Ruiz-Baca ◽  
...  
Keyword(s):  
Acidithiobacillus Thiooxidans ◽  
Depth Profiles ◽  
Concentration Depth Profiles

Quantitative Phase-Composition Analysis of Liquid-Phase-Sintered Silicon Carbide Using the Rietveld Method

2004 ◽  
Vol 83 (9) ◽  
pp. 2282-2286 ◽  
Author(s):  
Angel L. Ortiz ◽  
Francisco L. Cumbrera ◽  
Florentino Sánchez-Bajo ◽  
Fernando Guiberteau ◽  
Huiwen Xu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Phase Composition ◽  
Liquid Phase ◽  
Rietveld Method ◽  
Composition Analysis ◽  
Quantitative Phase ◽  
Phase Composition Analysis ◽  
Sintered Silicon

scholarly journals Effects of Environmental Factors on Concrete Carbonation Depth and Compressive Strength

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2167 ◽  
Author(s):  
Ying Chen ◽  
Peng Liu ◽  
Zhiwu Yu
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Relative Humidity ◽  
Co2 Concentration ◽  
Crystal Structure Analysis ◽  
Hydration Products ◽  
Carbonation Depth ◽  
Concrete Carbonation ◽  
Before And After ◽  
Compressive Strength Of Concrete

The influence of temperature, CO2 concentration and relative humidity on the carbonation depth and compressive strength of concrete was investigated. Meanwhile, phase composition, types of hydration products and microstructure characteristics of samples before and after the carbonation were analyzed by XRD and ESEM. Research results demonstrate that temperature, CO2 concentration and relative humidity influence the carbonation depth and compressive strength of concrete significantly. There is a linear relationship between temperature and carbonation depth, as well as the compressive strength of concrete. CO2 concentration and relative humidity present a power function and a polynomial function with carbonation depth of concrete, respectively. The concrete carbonation depth increases with the increase of relative humidity and reaches the maximum value when the relative humidity is 70%. Significant differences of phase composition, hydration products and microstructure are observed before and after the carbonation. Carbonization products of samples are different with changes of temperatures (10 °C, 20 °C and 30 °C). The result of crystal structure analysis indicates that the carbonation products are mainly polyhedral spherical vaterite and aragonite.

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