Reduced oxygen-related defects and low impurity diffusions, due to non-oxide ceramic crucible material
Reduced SiC inclusions, due to lower CO concentration
The final quality of silicon wafers depends greatly on the conditions under which crystallization takes place. When using high oxygen-containing crucible material in direct contact with graphite supports, a high level of CO gas must be introduced in the furnace atmosphere.
With Steuler Solar reusable ceramic crucibles, this problem is eliminated as our crucible reaction bonds with oxides only as small trace elements. Composed of a non-oxide ceramic, our crucibles significantly reduce most oxygen-related defects, improving minority carrier lifetime and the resultant overall electrical performance of solar cells.
Our Steuler Solar reusable ceramic crucibles are made with raw materials of the highest purity. No reaction catalysts such as iron or other metal oxides are added in the process. A number of metal impurities known to reduce the electrical performance of wafers are reduced by up to 90% compared with traditional crucibles. As our crucibles are ceramic, problems arising from the diffusion mechanism from crucible to silicon melt are as well reduced.
The reduced in CO concentration results in reduced SiC ingot inclusions. This in turn reduces breakage during wafer sawing, increasing yield.