Large area silicon sheet by EFG. Second quarterly report, April 1, 1977--June 30, 1977

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During the quarter on which this document reports significant amounts of 2'' wide ribbon have been grown from both growth systems at speeds up to 2''/min. Solar cells prepared from the material have shown conversion efficiencies up to 8% (AM1). Thus, it is believed that the basic effort to produce reasonably clean conditions in these resistance heated furnaces has succeeded. However, the ribbons produced show a cross-sectional structure which is significantly different from that of induction furnace grown ribbon (1'' wide at a rate of 1''/min). Also, the ribbon produced in this program has unusually large inhomogeneities across its width. … continued below

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107 pages

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Wald, F. V. June 15, 1977.

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During the quarter on which this document reports significant amounts of 2'' wide ribbon have been grown from both growth systems at speeds up to 2''/min. Solar cells prepared from the material have shown conversion efficiencies up to 8% (AM1). Thus, it is believed that the basic effort to produce reasonably clean conditions in these resistance heated furnaces has succeeded. However, the ribbons produced show a cross-sectional structure which is significantly different from that of induction furnace grown ribbon (1'' wide at a rate of 1''/min). Also, the ribbon produced in this program has unusually large inhomogeneities across its width. Some hypotheses to explain both of these features are advanced and the possible implications for solar cell performance are touched upon. The multiple ribbon growth system (JPL No. 3A) has shown a number of flaws with respect to the reliability of the basic furnace design. These definitely need to be rectified before any significant demonstration of multiple ribbon growth can proceed. The cartridges, however, have performed quite well. The work on 3'' cartridge design and automatic controls has proceeded nearly on schedule and the report contains a detailed description of the approach and the equipment to be used for automatic control of ribbon width.

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107 pages

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Dep. NTIS, PC A06/MF A01.

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  • June 15, 1977

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  • Jan. 23, 2019, 12:54 p.m.

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  • March 22, 2021, 3:28 p.m.

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Wald, F. V. Large area silicon sheet by EFG. Second quarterly report, April 1, 1977--June 30, 1977, report, June 15, 1977; United States. (https://digital.library.unt.edu/ark:/67531/metadc1408121/: accessed May 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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