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SINTEF-Heliosi Crystallisation

[Cheetah Partner]
  • Silicon crystallization, including multicrystalline and monocrystalline silicon

Technical Info

MAIN FEATURES

 

SINTEF is operating two induction heated furnaces for customized directional solidification of silicon and Czochralski pullers

 

 

INDUCTION HEATED FURNACES:

SINTEF is operating two induction heated furnaces for customized directional solidification of silicon

 

1. Crystalox DS-250

  • Located in a class 10 000 clean room
  • 12 kg cylindrical ingots, diameter 250 mm, height 105 mm
  • Heat extraction combining various techniques
  • Possibility for different crucible rotation patterns, taking melt samples/adding material to melt
  • Micro-GC for online melt atmosphere measurements
  • In-house developed control and data acquisition software

2. Cyberstar PV-furnace

  • Gen. 3, up to 120 kg, square 550 mm x 550 mm ingots
  • Independently controlled upper and lower heaters
  • Possibility for mounting electromagnetic stirrer and adding material during/afte melting, taking melt samples

 

CZOCHRALSKI PULLERS

SINTEF operates two Czochralski pullers for customized crystallization of solar grade silicon,one FerroTec CZ2208 and one small Cz puller

 

1. FerroTec CZ2208

  • Hot zone for 20'' crucibles
  • Up to 6'' ingots (8'' in near future)
  • Up to 120 kg charge weight

2. Small Cz

  • 15 kg cylindrical crystals, diameter 4 inch
  • Hot zone for 12 inch crucibles
  • In house developed software with data acquisition
  • Various furnace tanks and lids allows for flexibility and new development
  • Last update : Oct 2011

 

MODELLING OF SI CASTING:

SINTER focus is to understand design and optimize processes for the production of high quality silicon ingots (mono- and multi crystalline). Thorough validation of the models is based on the close interaction with experimental activities.

 

LIMITATIONS OR CONSTRAINTS :

For the crystallization the experiments are carried out by SINTEF.

 

TYPICAL SERVICE

  • Testing of silicon feedstock
  • Testing of additions to feedstock, either before charging or later in the run
  • Testing of crucible and coating material
  • Tracing of impurity elements and their distribution in the ingot
  • Recharging P- and n-type
  • Control of defect formation
  • Semi continuous casting
  • Addition of elements and dopants
  • Hot zone development
  • Oxygen control

PARTICIPATION TO PROJECTS

  • Experiments and modelling to understand and optimize the process for crystallization of ingots (mono- and multi crystalline)

Equipment & Instruments

PV Technologies

PV RTD Tags

Contacts

Main contact

ØVRELID Eivind