Solar cells fabricated without gasification of metallurgical-grade silicon. The substrates are prepared by: melting metallurgical grade silicon in a furnace; solidifying the melted metallurgical grade silicon into an ingot; slicing the ingot to obtain a plurality of wafers; polishing and cleaning each...http://www.google.fr/patents/US7951640?utm_source=gb-gplus-shareBrevet US7951640 - Low-cost multi-junction solar cells and methods for their production
Low-cost multi-junction solar cells and methods for their production
