A new spin cast process for mass-production of polycrystalline silicon sheets

A spin cast process for producing polycrystalline silicon sheets for low-cost and high-efficiency solar cells and equipment for its application to mass production are discussed. This process makes it possible to produce high-quality silicon sheets with a production rate of 15 s/sheet. A maximum solar cell efficiency of over 13% is obtained. To reduce production time, a crystal growth zone occurs in the equipment between the spinning zone and the cooling zone. The crystal grows after the spinning process with a physical growth rate of 20 mm/min when mold modules in the crystal growth zone are transferred to the cooling zone