Sell Cz Semi Grade Pot Scrap

Description

The seed has the same crystal orientation required in the finished ingot. To achieve doping uniformity, the seed crystal and the crucible of molten silicon are rotated in opposite directions. Once conditions for the crystal growth have been met, the seed crystal is slowly lifted out of the melt. Growth begins with a rapid pulling of the seed crystal in order to minimize the number of crystal defects within the seed at the beginning of the growing process. The pull speed is then reduced to allow the diameter of the crystal to increase. When the desired diameter is obtained the growth conditions are stabilized to maintain the diameter. As the seed is slowly raised above the melt, the surface tension between the seed and the melt causes a thin film of the silicon to adhere to the seed and then to cool. While cooling, the atoms in the melted silicon orient themselves to the crystal structure of the seed.