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Natural Gas Essay Examples

Natural Gas

...In the first years, only Czochralski (Cz) grown single crystals were used for solar cells. This material still plays an important role. As the cost of silicon is a significant proportion of the cost of a solar cell, great efforts have been made to reduce these costs. One technology, which dates back to the 1970s, is block casting which avoids the costly puling process. Silicon is melted and poured into a square SiO/SiN coated graphite crucible. Controlled cooling produces a polycrystalline silic...

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