Limiting Factors for the Application of Crystalline Upgraded Metallurgical Grade Silicon



V. Schlosser

A-1060 Vienna, Austria



Abstract-Differently processed upgraded metallurgical grade silicon (UMG-Si) has been used to produce planar diffused solar cells. The results obtained from these cells were used to evaluate the 1imiting factors governing the conversion efficiency in UMG-Si-cells. The present state of practical cell processing was taken into accourt for the discussion of the potential of new technologies. For conventionally processed cells on UMG-Si having a planar junction, it appears,that a conversion efficiency of about 13 percent under AM1.5 conditions (incident light intensity = 1kWm-2, T = 27 degrees Centigrade) cannot be exceeded. Experimentally a conversion efficiency of 10.5 percent was obtaind.

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