Increasing Cell Efficiency of S-Web Silicon Ribbon Material Using Synthetic Silica Crucibles

For solar cell application Si ribbons 12 cm wide and up to 150 m long have been grown with a pulling speed of 1m/min by the S-web technique. The ribbon material is polycrystalline with grain sizes in the order of mm2. This should allow to process cells with efficiencies up to 15%. Efficiencies of 12% for test solar cells of 20 mm x 20 mm in size have been reported earlier.