A Thermal Instability in the Laser-Driven Melting and Recrystallization of Thin Silicon Films on Glass Substrates

1987 ◽  
Vol 109 (4) ◽  
pp. 841-847 ◽  
Author(s):  
C. P. Grigoropoulos ◽  
R. H. Buckholz ◽  
G. A. Domoto
Keyword(s):  
Thermal Instability ◽  
Scanning Speed ◽  
Silicon Films ◽  
Temperature Fields ◽  
Linear Perturbation ◽  
Conductive Heat ◽  
Glass Substrates ◽  
Conductive Glass ◽  
Temperature Distributions ◽  
Thin Silicon

This paper develops a conductive heat transfer stability theory for the laser-driven melting and recrystallization of thin silicon films deposited on conductive (glass) substrates. The important parameters are: laser power, laser intensity distribution, and beam scanning speed. Basic state temperature distributions are obtained for straight phase boundaries. These calculated temperature distributions show the origin of instability. A linear perturbation analysis is used to obtain the leading order corrections to the basic-state temperature fields. The perturbation time rate of growth, as a function of the disturbance wavelength, is then predicted.

Lifetime Regime in the Electrically-Detected Transient Grating Method Applied to Amorphous and Microcrystalline Silicon Films

2002 ◽  
Vol 715 ◽  
Author(s):  
P. Sanguino ◽  
M. Niehus ◽  
S. Koynov ◽  
P. Brogueira ◽  
R. Schwarz ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Analytical Calculation ◽  
Chemical Vapor ◽  
Silicon Films ◽  
Dielectric Relaxation Time ◽  
Transient Grating ◽  
Minority Carrier Diffusion Length ◽  
Carrier Recombination ◽  
Thin Silicon ◽  
Good Agreement

AbstractThe minority-carrier diffusion length in thin silicon films can be extracted from the electrically-detected transient grating method, EDTG, by a simple ambipolar analysis only in the case of lifetime dominated carrier transport. If the dielectric relaxation time, τdiel, is larger than the photocarrier response time, τR, then unexpected negative transient signals can appear in the EDTG result. Thin silicon films deposited by hot-wire chemical vapor deposition (HWCVD) near the amorphous-to-microcrystalline transition, where τR varies over a large range, appeared to be ideal candidates to study the interplay between carrier recombination and dielectric response. By modifying the ambipolar description to allow for a time-dependent carrier grating build-up and decay we can obtain a good agreement between analytical calculation and experimental results.

A simple quality factor for characterization of thin silicon films

2008 ◽  
Vol 354 (19-25) ◽  
pp. 2227-2230 ◽  
Author(s):  
J. Kočka ◽  
T. Mates ◽  
M. Ledinský ◽  
H. Stuchlíková ◽  
J. Stuchlík ◽  
...  
Keyword(s):  
Quality Factor ◽  
Silicon Films ◽  
Thin Silicon

Optical properties of ultra-thin silicon films deposited on nanostructured anodic alumina surfaces

2014 ◽  
Vol 104 (8) ◽  
pp. 081119 ◽  
Author(s):  
Shu-Yi Wang ◽  
Diana-Andra Borca-Tasciuc ◽  
Deborah A. Kaminski
Keyword(s):  
Optical Properties ◽  
Anodic Alumina ◽  
Silicon Films ◽  
Thin Silicon

scholarly journals Pulsed UV Laser Processing of Carbosilane and Silazane Polymers

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 372 ◽  
Author(s):  
Samuel Ligon ◽  
Gurdial Blugan ◽  
Jakob Kuebler
Keyword(s):  
Laser Beam ◽  
Laser Processing ◽  
Scanning Speed ◽  
Inert Atmosphere ◽  
Laser Wavelength ◽  
Uv Laser ◽  
Glass Substrates ◽  
Polymer Precursors ◽  
Laser Systems ◽  
Pre Treatment

Freestanding SiCNO ceramic pieces with sub-mm features were produced by laser crosslinking of carbosilane and silazane polymer precursors followed by pyrolysis in inert atmosphere. Three different pulsed UV laser systems were investigated, and the influence of laser wavelength, operating power and scanning speed were all found to be important. Different photoinitiators were tested for the two lasers operating at 355 nm, while for the 266 nm laser, crosslinking occurred also without photoinitiator. Pre-treatment of glass substrates with fluorinated silanes was found to ease the release of green bodies during solvent development. Polymer crosslinking was observed with all three of the laser systems, as were bubbles, surface charring and in some cases ablation. By focusing the laser beam several millimeters above the surface of the resin, selective polymer crosslinking was observed exclusively.

scholarly journals Microwave Spectroscopic Detection of Human Hsp70 Protein on Annealed Gold Nanostructures on ITO Glass Strips

Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 118
Author(s):  
Rodica Ionescu ◽  
Raphael Selon ◽  
Nicolas Pocholle ◽  
Lan Zhou ◽  
Anna Rumyantseva ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Stress Disorders ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Conductive Glass ◽  
Hsp70 Protein ◽  
Atomic Force ◽  
Ito Glass ◽  
First Time ◽  
Human Heat Shock Protein

Conductive indium-tin oxide (ITO) and non-conductive glass substrates were successfully modified with embedded gold nanoparticles (AuNPs) formed by controlled thermal annealing at 550 °C for 8 h in a preselected oven. The authors characterized the formation of AuNPs using two microscopic techniques: scanning electron microscopy (SEM) and atomic force microscopy (AFM). The analytical performances of the nanostructured-glasses were compared regarding biosensing of Hsp70, an ATP-driven molecular chaperone. In this work, the human heat-shock protein (Hsp70), was chosen as a model biomarker of body stress disorders for microwave spectroscopic investigations. It was found that microwave screening at 4 GHz allowed for the first time the detection of 12 ng/µL/cm2 of Hsp70.

Stability of phase boundaries on thin silicon layers with glass substrates

1987 ◽  
Vol 62 (2) ◽  
pp. 474-480 ◽  
Author(s):  
Costas P. Grigoropoulos ◽  
Richard H. Buckholz ◽  
Gerald A. Domoto
Keyword(s):  
Phase Boundaries ◽  
Glass Substrates ◽  
Thin Silicon
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