The Czochralski crystal-growing system SC 22 has been specially designed for the industrial production of monocrystalline Silicon crystals (ingots) in the solar industry. The modular system concept means that it can be optimized in line with the customer’s needs. The 22" hot zone is optimized for minimal energy consumption, can be charged with up to 140 kg of Silicon (without feeder) and, in the standard process, can produce crystals with a diameter of up to 200 mm (8"), although diameters of up to 230 mm (9") are possible.
Depending on the diameter and charge, crystals with a length of up to 2.8 m can be pulled. The maximum crystal pulling rate is 10 mm/min, while the maximum crystal and crucible rotation rate is 35 rpm. A camera system for measuring the diameter and two pyrometers for measuring the temperature allow automatic process control by means of a PLC and PC. The user-friendly graphical interface for process control and monitoring is optimized for mass production. We also offer vacuum pumps and dust filters (SiO) specially optimized in line with your system requirements. A feeder allows the original crucible charge in the SC 22 to be increased to 180 kg. The system also allows multiple crystals to be pulled from one crucible (multi-pulling). An optional active crystal cooling system for increasing the axial temperature gradient can be used to significantly accelerate the crystal pulling rate and, in turn, improve productivity. A crucible charging system and crystal removal system are available as accessories.