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  • 1
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    Directed-energy process technology efforts (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A summary of directed-energy process technology for solar cells was presented. This technology is defined as directing energy or mass to specific areas on solar cells to produce a desired effect in contrast to exposing a cell to a thermal or mass flow environment. Some of these second generation processing techniques are: ion implantation; microwave-enhanced chemical vapor deposition; rapid thermal processing; and the use of lasers for cutting, assisting in metallization, assisting in deposition, and drive-in of liquid dopants. Advantages of directed energy techniques are: surface heating resulting in the bulk of the cell material being cooler and unchanged; better process control yields; better junction profiles, junction depths, and metal sintering; lower energy consumption during processing and smaller factory space requirements. These advantages should result in higher-efficiency cells at lower costs. The results of the numerous contracted efforts were presented as well as the application potentials of these new technologies.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proceedings of the 25th Project Integration Meeting; p 111-122
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Flat-plate solar array project. Volume 5: Process development (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The goal of the Process Development Area, as part of the Flat-Plate Solar Array (FSA) Project, was to develop and demonstrate solar cell fabrication and module assembly process technologies required to meet the cost, lifetime, production capacity, and performance goals of the FSA Project. R&D efforts expended by Government, Industry, and Universities in developing processes capable of meeting the projects goals during volume production conditions are summarized. The cost goals allocated for processing were demonstrated by small volume quantities that were extrapolated by cost analysis to large volume production. To provide proper focus and coverage of the process development effort, four separate technology sections are discussed: surface preparation, junction formation, metallization, and module assembly.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-180663 , JPL-PUB-86-31-VOL-5 , NAS 1.26:180663 , DOE/JPL-1012-125-VOL-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Environmental tests of metallization systems for terrestrial photovoltaic cells (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Seven different solar cell metallization systems were subjected to temperature cycling tests and humidity tests. Temperature cycling excursions were -50 deg C to 150 deg C per cycle. Humidity conditions were 70 deg C at 98% relative humidity. The seven metallization systems were: Ti/Ag, Ti/Pd/Ag, Ti/Pd/Cu, Ni/Cu, Pd/Ni/Solder, Cr/Pd/Ag, and thick film Ag. All metallization systems showed a slight to moderate decrease in cell efficiencies after subjection to 1000 temperature cycles. Six of the seven metallization systems also evidenced slight increases in cell efficiencies after moderate numbers of cycles, generally less than 100 cycles. The copper based systems showed the largest decrease in cell efficiencies after temperature cycling. All metallization systems showed moderate to large decreases in cell efficiencies after 123 days of humidity exposure. The copper based systems again showed the largest decrease in cell efficiencies after humidity exposure. Graphs of the environmental exposures versus cell efficiencies are presented for each metallization system, as well as environmental exposures versus fill factors or series resistance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL-PUBL-85-86 , DOE/JPL-1012-113 , NAS 1.26:177215 , NASA-CR-177215
    Format: application/pdf
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  • 4
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    Mechanisms limiting the performance of large grain polycrystalline silicon solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The open-circuit voltage and short-circuit current of large-grain (1 to 10 mm grain diameter) polycrystalline silicon solar cells is determined by the minority-carrier diffusion length within the bulk of the grains. This was demonstrated by irradiating polycrystalline and single-crystal (Czochralski) silicon solar cells with 1 MeV electrons to reduce their bulk lifetime. The variation of short-circuit current with minority-carrier diffusion length for the polycrystalline solar cells is identical to that of the single-crystal solar cells. The open-circuit voltage versus short-circuit current characteristic of the polycrystalline solar cells for reduced diffusion lengths is also identical to that of the single-crystal solar cells. The open-circuit voltage of the polycrystalline solar cells is a strong function of quasi-neutral (bulk) recombination, and is reduced only slightly, if at all, by grain-boundary recombination.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Solar Energy Conference; Oct 17, 1983 - Oct 21, 1983; Athens; Greece
    Format: text
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