Comparative Characteristics of GaAs and InAs Langmuir Evaporation - Monte Carlo Simulation

Spirina, Anna A.; Neizvestny, Igor; Shwartz, Nataliya L.

doi:10.4028/www.scientific.net/DDF.386.27

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Comparative Characteristics of GaAs and InAs Langmuir Evaporation - Monte Carlo Simulation

Abstract:

The process of GaAs and InAs substrates high-temperature annealing under the Langmuir evaporation conditions is studied by Monte Carlo simulation. The temperature range of gallium arsenide and indium arsenide congruent and incongruent evaporation are determined. It was demonstrated that the congruent evaporation temperature T_c is sensitive to the vicinal surface terrace width. The decrease of the terrace width results in a decrease in the congruent evaporation temperature. The Ga and In diffusion lengths along the (111)A and (111)B surfaces at congruent temperatures are estimated. The surface morphology transformation kinetic during high-temperature annealing is analyzed.

Info:

Periodical:

Defect and Diffusion Forum (Volume 386)

Main Theme:

Physics and Technology of Nanostructured Materials IV

Edited by:

Nikolay G. Galkin

Pages:

27-32

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.386.27

Citation:

A. A. Spirina et al., "Comparative Characteristics of GaAs and InAs Langmuir Evaporation - Monte Carlo Simulation", Defect and Diffusion Forum, Vol. 386, pp. 27-32, 2018

Online since:

September 2018

Authors:

Anna A. Spirina *, Igor Neizvestny, Nataliya L. Shwartz

Keywords:

GaAs, InAs, Langmuir Evaporation, Monte Carlo, Simulation

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References

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Paper TitlePages

On the Dynamics of Wetting of Water-Methanol Volatile Sessile Drops on Smooth Substrates

Authors: S. David, Khellil Sefiane, Martin E.R. Shanahan

Abstract: The wetting and evaporation behaviour of methanol-water droplets deposited on a smooth silicon substrate were investigated experimentally. Contact angle and droplet shape kinetics were studied using an optical technique. Drops were deposited onto a silicon substrate and enclosed in a cell with nitrogen as the ambient gas. Besides the case of pure water and pure methanol, three different volume fractions of methanol in water were investigated: 10%, 50% and 80%. Using a Kruss DSA100 contact angle analyser, the behaviour of the contact angle, droplet volume, and base width was determined as a function of time. Results show that evaporation of the droplet takes place in successive stages for mixtures. The more volatile component seems to evaporate principally in the first stage, during which the contact angle of the binary drop is closer to that of pure methanol. Because the wetting behaviour is partly dictated by the surface tension of the liquid-vapour interface, methanol is believed to be concentrated at the interface during this first stage. After complete evaporation of the methanol, the wetting behaviour of the droplet tends towards that of pure water. The mechanisms that dictate the evaporation and wetting behaviour of such binary droplets include many effects: diffusion of methanol in water in the liquid phase; accumulation of one of the component near the interface and preferential evaporation followed by diffusion of one component in another in the vapour phase. In order to model the phenomenon, the above effects must be taken into account. Solutal Marangoni stress as well as interfacial instabilities may also play an important role in the behaviour of theses systems.

469

Critical Flow Theory on Nonlinear Penetrating Mechanism of High Energy Beam Drilling

Authors: Je Ee Ho, Da Chih Chen

Abstract: For most of previous study on electron beam drilling (E.B) or laser beam drilling (L.B), the evaporating phenomena was assumed to be a minor parameter and could be neglected. In fact, the assumption usually leads to the overestimation of drilling efficiency and causes a significant deviation from experiment result. To improve this defect, a critical flow theory, based on the reacting pressure downward into the melting layer, is first introduced in this study; which not only successfully separates the evaporating model to convective model, but the critical transition of drilling characteristic will be also accessed. Examine the melting cavity of copper drilling conducted in E.B process, the evaporating phenomena responsible for drilled cavity had been verified to be as a prior parameter as the incident energy density is below 6×10¹⁰ w/m². When compared with the experiment data made by Allmen [1], proposed theory shows an excellent agreement for copper drilling and their relative errors are no more than 30%.

3949

The Evaporation Effect of Front Keyhole Wall in Penetration Welding with an Electron Beam

Authors: Yi Luo, Jin He Liu, Chang Hua Du, Hui Bin Xu, Chun Tian Li

Abstract: The process of vacuum electron beam welding is characterized by deep-penetration with the action of keyhole effect. The assumption of simple cylindrical physical model of keyhole is reasonable according to the thermal transfer of the keyhole effect during welding. There is an intensive evaporation arises from the front keyhole wall owing to the high energy density of electron beam. Therefore, an analysis model of heat transfer at the interface of vapor phase and front keyhole wall was proposed to the temperature calculation on the basis of heat transfer theory. The evaporation of the primary elements, which are Mg, Al, Zn and Mn in AZ series magnesium alloy, can be analyzed by the model, as well as the influence of keyhole radius varying on the temperature at vapor-solid interface offront keyhole wall. And dimensionless parameters are introduced to analyze the influence of the process condition on the thermal effect. The calculation results show that Mg and Zn are vulnerable to vaporize loss during the vacuum electron beam welding on AZ series magnesium alloy, and the evaporation of Mg occurs earlier than Zn. A longer electron beam acting duration and smaller keyhole size will increase the temperature of the front keyhole wall significantly, which has a considerable influence on the evaporation effect of the elements.

355

Research Progress of Fractionation Mechanism of Stable Hydrogen and Oxygen Isotope during Water Body Evaporation

Authors: Hong Yun Ma, Zhen Hong Zhao, Dong Wang, Jun Zhang, Li Guo, Zhi Jun Li

Abstract: Evaporation is the most significant process that affects the isotopic transport of surface water. The study of mechanisms and modeling of the evaporation process has a very important practical significance in improving the isotopic analysis method. This paper reviews the international development of the mechanism of hydrogen and oxygen stable isotopic fractionation and model. It indicates that as the most ideal tracers of hydrologic cycle, stable hydrogen and oxygen isotopes have their unique and irreplaceable functions. However, field experiments of evaporation and further research are limited by the complexities of kinetic flow in the atmosphere and observation technique. Modeling and experiments are commonly based on the assumption that evaporating water is well-mixed, and isotopic stratification in liquid is not considered by most laboratories. While it dose affect. Flow disturbance in the atmosphere is the most uncertain factor for isotopic fractionation in the process of evaporation. The modeling example shows isotopic evaporation line of natural water can be simulated properly while detailed simulations are limited by the lake of observational data of isotopic diffusion processes in both air phase and liquid phase.

2588

Transient Analysis of Inlet Fogging Process for Gas Turbine Systems

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