Description:
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Polycrystalline silicon sheets having a 150 mm diameter or 100 mm square with thicknesses of 0.3 to 0.4 mm have been obtained directly by spinning the silicon melt dropped on the plate. A production time of the sheet formation from the melt is about one second per sheet. The crystallites of the sheet have columnar structures. Material loss in the production process is little or none because of a clean recovery of the surplus silicon. Using this sheet, p-n junction solar cells with AMI efficiencies of 5.8 to 6.1% have been made experimentally.
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