Gas Phase Reactions Relevant to Chemical Vapor Deposition: Optical Diagnostics

1989 ◽  
Vol 168 ◽  
Author(s):  
D. Burgess
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Optical Emission ◽  
Laser Photolysis ◽  
Particle Nucleation ◽  
Gas Phase Reactions ◽  
Decomposition Processes ◽  
Rate Of Reaction

AbstractLaser photolysis, optical emission, and laser-induced fluorescence (LIF) were used to investigate laser driven decomposition processes in the gas phase pertaining to the systems: SiH4 → Si (s) and SiH4 → NH3 → Si3N4 (s). These processes are important to silicon/ silicon-nitride chemical vapor deposition, flame-driven gas phase silicon-particle nucleation, and laser-induced processes for materials fabrication. UV laser photolysis was used to generate SiHx and NHx species from silane and ammonia. A number of photofragments were identified by emission from excited states. The rate of reaction of NH2 with silane was measured using LIF to detect NH2 as a function of time following photolysis of ammonia

Gas Phase Reactions Relevant to Chemical Vapor Deposition: Numerical Modeling

1989 ◽  
Vol 168 ◽  
Author(s):  
D. Burgess ◽  
M. R. Zachariah
Keyword(s):  
Numerical Modeling ◽  
Chemical Vapor Deposition ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Phase Particle ◽  
Chemical Vapor ◽  
Particle Nucleation ◽  
Gas Phase Reactions ◽  
Experimental Conditions ◽  
Silicon Based

AbstractNumerical modeling of gas phase chemical kinetics was used to investigate reactions following silane decomposition to suggest experimental conditions and to interpret concentrations measurements. The effects of concentration and temperature gradients on kinetic pathways and reactive intermediates were studied. These processes are relevant to silicon-based chemical vapor deposition (CVD), to flame-driven gas phase particle nucleation, and to laser-induced processes for materials fabrication.

A Comprehensive Multiphysics, Multiscale Study of Reactor Chamber and Substrate Orientation Effects on Carbon Nanotube Synthesis During Chemical Vapor Deposition Process

2008 ◽  
Author(s):  
Mahmoud Reza Hosseini ◽  
Nader Jalili ◽  
David A. Bruce
Keyword(s):  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Temperature Profile ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Physical Property ◽  
Fabrication Process ◽  
Multiphase Model ◽  
Gas Phase Reactions

A comprehensive multiphysics, multiphase model of carbon nanotube (CNT) fabrication process by chemical vapor deposition (CVD) is utilized to study the effects of several physical phenomena inside the quartz tube. The investigations include fluid flow properties, temperature profile and heat transfer as well as diffusion and concentration of carbon species along the substrate. These properties are examined in a great detail for a horizontally placed substrate. For each physical property, the effects of substrate dislocation as well as the angle between substrate and reactor chamber longitudinal axis are investigated. It is shown that the temperature in the gas phase reactions region is significantly lower compared to the temperature profile around the substrate. Based on the obtained results, two new CVD system designs are proposed to enhance the temperature in the reactor chamber section where gas phase reactions take place. Moreover, it is shown that substrate dislocation and angle change result in physical property change such as species concentration on upper and lower substrate surfaces. This study is also applicable to other CVD-based fabrication process such as deposition of any layer, since the methodology of the fabrication process remains the same.

FTIR In Situ Studies of the Gas Phase Reactions in Chemical Vapor Deposition of SiC

1995 ◽  
Vol 142 (7) ◽  
pp. 2357-2362 ◽  
Author(s):  
S. Jonas ◽  
W. S. Ptak ◽  
W. Sadowski ◽  
E. Walasek ◽  
C. Paluszkiewicz
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Gas Phase Reactions ◽  
In Situ Studies

Roles of Gas Phase and Surface Photolysis in Laser Chemical Vapor Deposition from Fe(CO)5

1989 ◽  
Vol 158 ◽  
Author(s):  
Xin Xu ◽  
J.I. Steinfeld
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Laser Photolysis ◽  
Chemical State ◽  
Xps Analysis ◽  
Laser Chemical Vapor Deposition ◽  
Iron Films

ABSTRACTThe chemical state of the carbon and oxygen incorporated in iron films formed by laser photolysis of Fe(CO)5 has been examined by profiling XPS analysis. A significant portion of the codeposited CO is photodissociated at the growing surface.

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