Correlation between photoluminescence and surface species in porous silicon: Low‐temperature annealing

1994 ◽  
Vol 64 (15) ◽  
pp. 1983-1985 ◽  
Author(s):  
L. Tsybeskov ◽  
P. M. Fauchet
Keyword(s):  
Porous Silicon ◽  
Low Temperature ◽  
Surface Species ◽  
Low Temperature Annealing

STABLE PHOTOLUMINESCENCE IN LOW-TEMPERATURE ANNEALED POROUS SILICON

2001 ◽  
Vol 15 (24) ◽  
pp. 1077-1085 ◽  
Author(s):  
DELIANG ZHU ◽  
QIANWANG CHEN ◽  
YUHENG ZHANG
Keyword(s):  
Porous Silicon ◽  
Low Temperature ◽  
Luminescence Intensity ◽  
Ambient Air ◽  
Peak Position ◽  
Low Temperature Annealing ◽  
Improved Stability

The low-temperature annealing of porous silicon (PS) has been studied in ambient air and vacuum. After air-annealed samples were again stored in air for a period of time, their luminescence exhibited improved stability in comparison to fresh samples. But their luminescence intensity is much weaker than that of fresh samples, and their peak position moves to shorter wavelengths. A stoichiometric oxide SiO2 can easily be formed on PS surfaces if the annealing is performed in vacuum. The SiO2 layer prevents nc-Si from further oxidation and guarantees the luminescence intensity and that peak position remains unchanged with air storage.

Low-temperature annealing of YBa2Cu3O7-x

1992 ◽  
Vol 50 (1) ◽  
pp. 88-89
Author(s):  
R.L. Sabatini ◽  
Yimei Zhu ◽  
Masaki Suenaga ◽  
A.R. Moodenbaugh
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Temperature ◽  
Oxygen Diffusion ◽  
Diffusion Rate ◽  
Oxygen Depletion ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Microstructural Effects ◽  
Oxygen Diffusion Rate

Low temperature annealing (<400°C) of YBa2Cu3O7x in a ozone containing oxygen atmosphere is sometimes carried out to oxygenate oxygen deficient thin films. Also, this technique can be used to fully oxygenate thinned TEM specimens when oxygen depletion in thin regions is suspected. However, the effects on the microstructure nor the extent of oxygenation of specimens has not been documented for specimens exposed to an ozone atmosphere. A particular concern is the fact that the ozone gas is so reactive and the oxygen diffusion rate at these temperatures is so slow that it may damage the specimen by an over-reaction. Thus we report here the results of an investigation on the microstructural effects of exposing a thinned YBa2Cu3O7-x specimen in an ozone atmosphere using transmission electron microscopy and energy loss spectroscopy techniques.

scholarly journals Effects of equal channel angular pressing and heat treatments on the microstructures and mechanical properties of selective laser melted and cast AlSi10Mg alloys

2021 ◽  
Vol 21 (3) ◽  
Author(s):  
Przemysław Snopiński ◽  
Mariusz Król ◽  
Marek Pagáč ◽  
Jana Petrů ◽  
Jiří Hajnyš ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Equal Channel Angular Pressing ◽  
Heat Treatments ◽  
Electron Backscattered Diffraction ◽  
Angular Pressing ◽  
Low Temperature Annealing ◽  
Transmission Electron ◽  
Before And After ◽  
The Impact

AbstractThis study investigated the impact of the equal channel angular pressing (ECAP) combined with heat treatments on the microstructure and mechanical properties of AlSi10Mg alloys fabricated via selective laser melting (SLM) and gravity casting. Special attention was directed towards determining the effect of post-fabrication heat treatments on the microstructural evolution of AlSi10Mg alloy fabricated using two different routes. Three initial alloy conditions were considered prior to ECAP deformation: (1) as-cast in solution treated (T4) condition, (2) SLM in T4 condition, (3) SLM subjected to low-temperature annealing. Light microscopy, transmission electron microscopy, X-ray diffraction line broadening analysis, and electron backscattered diffraction analysis were used to characterize the microstructures before and after ECAP. The results indicated that SLM followed by low-temperature annealing led to superior mechanical properties, relative to the two other conditions. Microscopic analyses revealed that the partial-cellular structure contributed to strong work hardening. This behavior enhanced the material’s strength because of the enhanced accumulation of geometrically necessary dislocations during ECAP deformation.

Improving the Performance of Green LEDs by Low-Temperature Annealing of p-GaN with PdZn

2009 ◽  
Vol 12 (5) ◽  
pp. H185 ◽  
Author(s):  
Ja-Yeon Kim ◽  
Min-Ki Kwon ◽  
Seong-Ju Park ◽  
Sunwoon Kim ◽  
Je Won Kim ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Annealing ◽  
Green Leds

Low-temperature annealing of heavily ion-implanted layer

1990 ◽  
Vol 73 (6) ◽  
pp. 86-91
Author(s):  
Tadahiro Ohmi ◽  
Yoshio Ishihara ◽  
Tadashi Shibata ◽  
Akira Okita
Keyword(s):  
Low Temperature ◽  
Low Temperature Annealing ◽  
Ion Implanted

Low temperature annealing of nanocrystalline Si paste for pn junction formation

2021 ◽  
Vol 135 ◽  
pp. 106093
Author(s):  
Yusuke Kuboki ◽  
Huan Zhu ◽  
Morihiro Sakamoto ◽  
Hiroshige Matsumoto ◽  
Kungen Teii ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Annealing ◽  
Pn Junction ◽  
Junction Formation ◽  
Nanocrystalline Si
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