Abstract

The travelling solvent method known as TSM is a process used to produce pure and homogeneous crystals. The TSM process has been tested on many alloys producing uniform and uncontaminated crystal products. A three-dimensional numerical simulation for the growth of Ge1-xSix by the travelling solvent method under axial rotation has been modelled. In this model a mesh sensitivity analysis has been carried out to find an optimum mesh which provides accurate results while saving computational time, The full Navier-Stokes equations together with the energy, mass transport and continuity equations were solved numerically using the finite element technique. The application of crucible rotation to the travelling solvent method is an attempt to control the buoyancy induced convection throughout the melt and to suppress the three-dimensional characteristics of unsteady heat flow. The application of different rotational speeds on the solvent has also been investigated. These different speeds of rotation were shown to have a considerable effect on the buoyancy induced flow. The solute distribution throughout the melt was also affected substantially. Taking these two factors into account plays a crucial role in the crystal growth process. The speed of rotation was found to have a significant effect on the intensity of the convective flow in the melt and an optimal rotational speed was encountered.

Highlights

  • With today’s technological demands, the production o f purer crystal structures o f semiconductor materials is required to increase the performance o f all m odem electronics

  • This chapter is broken down into two sections; the first section discusses the results obtained in the terrestrial condition and the second, the results obtained in the microgravity condition

  • At the position o f 0.03 cm above the growth interface quite a large variation o f concentration is observed which is undesirable for crystal growth where there is 9.1% silicon at the center and 6.5% towards the sides

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Summary

Introduction

We present the results obtained with the uniform heater profile applied to the TSM model under different rotational speeds. The uniform heater profile that was applied is shown in figure 3.1. This chapter is broken down into two sections; the first section discusses the results obtained in the terrestrial condition and the second, the results obtained in the microgravity condition.

Traveling solvent method
Model Description
Governing Equations
Navier-Stokes Equations
Dimensional Analysis
Model Dimensions
Model Boundary Conditions
2.53 Heater Profile
M esh Sensitivity Analysis
Terrestrial Condition
Microgravity Condition
CHAPTER 4 Non-Uniform Heating Condition
Findings
CHAPTERS Conclusion
Full Text
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