The objectives of this contract weren• To determine the feasibility of silicon epitaxial growth on low-cost silicon substrates for the development of silicon sheet capable of producing low-cost, high-efficiency solar cells.n• To achieve a goal of 12% (AM-O) efficient solar cells fabricated on thin epitaxial layers (<25 um) grown on low-cost substrates.n• To evaluate the add-on cost for the epitaxial process and to develop low-cost epitaxial growth procedures for application in conjunction with low-cost silicon substrates.nIn Section III, the basic epitaxial procedures and solar-cell fabrication and evaluation techniques are described, followed by a discussion of the de¬velopment of baseline epitaxial solar-cell structures, grown on high-quality conventional silicon substrates. This work resulted in the definition of three basic structures which reproducibly yielded efficiencies in the range of 12 to 13.7%.
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