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  • 1
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    Low cost silicon solar arrays (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Continuous growth methodology for silicon solar cell ribbons deals with capillary effects, die effects, thermal effects and crystal shape effects. Emphasis centers on the shape of the meniscus at the ribbon edge as a factor contributing to ribbon quality with respect to defect densities. Structural and electrical characteristics of edge defined, film-fed grown silicon ribbons are elaborated. Ribbon crystal solar cells produce AMO efficiencies of 6 to 10%.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proc. of the 1st ERDA Semiann. Solar Photovoltaic Conversion Program Conf.; p 104-171
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Low cost solar array project 1: Silicon material (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The low cost production of silicon by deposition of silicon from a hydrogen/chlorosilane mixture is described. Reactor design, reaction vessel support systems (physical support, power control and heaters, and temperature monitoring systems) and operation of the system are reviewed. Testing of four silicon deposition reactors is described, and test data and consequently derived data are given. An 18% conversion of trichlorosilane to silicon was achieved, but average conversion rates were lower than predicted due to incomplete removal of byproduct gases for recycling and silicon oxide/silicon polymer plugging of the gas outlet. Increasing the number of baffles inside the reaction vessel improved the conversion rate. Plans for further design and process improvements to correct the problems encountered are outlined.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-164162 , DOE/JPL-955269-80/5 , JPL-9950-515 , QPR-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Low-cost solar array project task 1: Silicon material. Gaseous melt replenishment system (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The operation of a silicon production technique was demonstrated. The essentials of the method comprise chemical vapor deposition of silicon, by hydrogen reduction of chlorosilanes, on the inside of a quartz reaction vessel having large internal surface area. The system was designed to allow successive deposition-melting cycles, with silicon removal being accomplished by discharging the molten silicon. The liquid product would be suitable for transfer to a crystal growth process, casting into solid form, or production of shots. A scaled-down prototype reactor demonstrated single pass conversion efficiency of 20 percent and deposition rates and energy consumption better than conventional Siemens reactors, via deposition rates of 365 microns/hr. and electrical consumption of 35 Kwhr/kg of silicon produced.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163764 , DOE/JPL-955269-80/6 , JPL-9950-596
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    EFG silicon ribbon solar cells (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The growth and characteristics of edge defined, film fed grown (EFG) silicon ribbons are discussed. Factors involved in the growth of continuous lengths of 1 in. wide ribbons are examined. The structural and electrical characteristics of the ribbons have been studied and the results are presented. Solar cells have been fabricated using the ribbon crystals and typical AMO efficiencies of 6 to 10% have been realized.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 06, 1975 - May 08, 1975; Scottsdale, AZ
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Low cost solar array project. Task 1: Silicon material, gaseous melt replenishment system (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A system to combine silicon formation, by hydrogen reduction of trichlorosilane, with the capability to replenish a crystal growth system is described. A variety of process parameters to allow sizing and specification of gas handling system components was estimated.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-162270 , DOE/JPL-955269-79-1 , DRL-113 , QPR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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