Large area silicon sheet by EFG. Fourth quarterly report, October 1, 1977--December 31, 1977

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A detailed economic evaluation is presented of several EFG ribbon growth technology scenarios using the ''SAMICS'' interim price estimation guidelines. It is concluded that the growth of 10 ribbons from a double five ribbon furnace of the general type represented by the existing Machine 3A would meet the requirements of producing ribbon at a price below $20/m/sup 2/ the 1986 goal. The technology requirements are that one operator can operate 2 of the 5 ribbon growth stations in which each ribbon grows at a speed of 7.5 cm/min and is also 7.5 cm wide. The machines also would have to … continued below

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Pages: 117

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Wald, F.V. January 15, 1978.

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A detailed economic evaluation is presented of several EFG ribbon growth technology scenarios using the ''SAMICS'' interim price estimation guidelines. It is concluded that the growth of 10 ribbons from a double five ribbon furnace of the general type represented by the existing Machine 3A would meet the requirements of producing ribbon at a price below $20/m/sup 2/ the 1986 goal. The technology requirements are that one operator can operate 2 of the 5 ribbon growth stations in which each ribbon grows at a speed of 7.5 cm/min and is also 7.5 cm wide. The machines also would have to achieve a duty cycle of 67% at minimum and yields above 75%. Finally, silicon must be available at $10 to approximately $25/kg, depending on the yield assumed. These conclusions are the final results of the economic analysis. The progress towards the growth of 7.5 cm wide ribbon at 7.5 cm/min is discussed. Also, fluid flow phenomena have been investigated and it is shown that by utilization of such phenomena the impurity distribution in the ribbon may be manipulated to a significant extent. Also, using a somewhat novel ''EBIC'' technique it was demonstrated that the internal grain structure found previously in some ribbons grown at high speeds has virtually no influence on the performance of the material when made into a solar cell.

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Pages: 117

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Dep. NTIS, PC A06/MF A01.

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  • January 15, 1978

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  • July 2, 2018, 10:52 p.m.

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  • Oct. 22, 2018, 1:33 p.m.

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Wald, F.V. Large area silicon sheet by EFG. Fourth quarterly report, October 1, 1977--December 31, 1977, report, January 15, 1978; United States. (https://digital.library.unt.edu/ark:/67531/metadc1194216/: accessed July 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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