Prof. François Dupret 1989 First research on Silicon growth in University of Louvain. 1992 First collaborations with major IC companies.
Development of defect-free silicon wafer production. Today, more than 35 patents are referencing FEMAG Software 2003 FEMAGSoft S.A., spin-off from University of Louvain. 2006 Collaboratrion with major Solar companies. Development of low-cost and low-oxygen content processes. 2009 Large investment for a new software framework 2010 Release of Software application for Sapphire ingot production.
Result using coarse mesh
Result using BLM mesh
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Velocity field
FEMAGSoft © 2012
FEMAG-HEM
FEMAG-HEM Software to simulate Sapphire Growth by Heat Exchange Method
Stream function
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FEMAGSoft © 2012
Melt meshes
BLM mesh is very important to simulate the interface
Coarse mesh
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BLM (boundary layer mesh)
FEMAGSoft © 2012
Sapphire Growth by CZ and kyropoulos
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Sapphire growth by HEM
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What are FEMAG software?
▪ Process-dedicated simulation tools, adapted to your own processes and able to solve your problems.
利用晶体生长软件FEMAG 对蓝宝石晶体生长仿真模拟方法
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FEMAGSoft S.A., Belgium
A SPIN-OFF company from
Universite catholique de Louvain Belgium
Professor F. Dupret
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Specifications: - Temperature in the sapphire and in all furnace components by solving the
global heat transfer in the furnace (radiation, conduction , convection). - Flow velocity in the sapphire liquid phase. - Crystallization front shape - Ohmic and Induction Heating - Advanced radiation heat transfer in the sapphire - Gas convection - Anisotropic thermal stresses in the crystal
Content
➢ General introduction ➢ Sapphire Growth
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Introduction
For more than 25 years, FEMAGSoft develops simulation software dedicated to the research and development of optimal crystal growth processes. 1984 First research on Germanium growth in University of Louvain.
CZ process with Induction Heating system
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Temperature in the crystal and in the melt
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FEMAG-CZ/OX
The interface shape and position is a result of the simulation
▪ Time Dependent
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Process-dedicated tools
▪ FEMAG-CZ : Czochralski ▪ FEMAG-FZ : Floating Zone ▪ FEMAG-VB : Vertical Bridgman ▪ FEMAG-CZ/OX : Czochralski for Sapphire ▪ FEMAG-KY : Kyropoulos ▪ FEMAG-DS : Directional Solidification ▪ FEMAG-HEM : Heat Exchange Method
CZ process with Induction Heating system
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Melt velocity amplitude
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FEMAG-CZ/OX / CZ and KYROPOULOS process
Temperature field in the melt
▪ Global ▪ All the furnace components are considered. ▪ All the heat transfer mode are considered (radiation transfer, heat conduction, melt and gas convection) ▪ Induction and ohmic heating
Local temperature field
BLM mesh enables a better prediction of the crystalisation interface
Page ▪R24esult using coarse mesh
Result using BLM mesh FEMAGSoft © 2012
Specifications: - Temperature in the sapphire and in all furnace components by solving the
global heat transfer in the furnace (radiation, conduction , convection). - Flow velocity in the sapphire liquid phase. - Crystallization front shape - Advanced radiation heat transfer in the sapphire - Gas convection - Anisotropic thermal stresses in the crystal
the resulting crystal quality.
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Sapphire Simulation Objective
CZOCHRALSKI
KYROPULOS
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HEM
FEMAG-CZ/OX
FEMAG-CZ/OX Software to simulate Sapphire Growth by CZ and Kyropoulos
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FEMAG-CZ/OX
Induction Heating system
CZ process with Induction Heating system
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Temperature in the Hot Zone
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FEMAG-CZ/OX
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Sapphire Simulation Objective
Our goal is to provide accurate simulation tool, able to take all the process features into account and to optimize the growth process in terms of
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Sapphire Crystal Growth Simulation
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Sapphire Simulation Objective
➢ The market of Sapphire is experiencing a very fast growth rate and become very competitive ➢Many companies invest in simulation software in order to reinforce their positions ➢ HEM, Czochralski and Kyropoulos process require optimization and a good understanding ➢ Strong need for efficient numerical tools. ➢ Radiation effects in the participating crystal and melt is a complex problem.