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Low Cost Production of Terrestrial Solar Arrays Utilizing EFG Silicon Ribbon Crystal

A new production line has been investigated for low cost terrestrial solar arrays using EFG silicon ribbon crystal. This paper describes the recent technical progress on EFG ribbon growth, wafer fabrication process for silicon ribbon, electrical output performance of ribbon solar cells and modules and also commercial solar arrays. EFG silicon ribbons with 50 mm width and 0.3∼0.5 mm thickness are grown continuously up to 50 meters long. Semi-automatic growth operation with ribbon width control by utilizing TV camera watching system is developed to achieve simultaneous and stable production from several growth stations. From this ribbon, 50×76 mm large area rectangular solar cells are successfully produced using screen printed metallization technology with an average conversion efficiency of 8%.