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  • 1
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    Solar-array-materials passive LDEF experiment (A0171) (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The objective of this experiment is to evaluate the synergistic effects of the space environment on various solar-array materials, including solar cells, cover slips with various antireflectance coatings, adhesive, encapsulants, reflector materials, substrate strength materials, mast and harness materials, structural composites, and thermal control treatments. The experiment is passive and consists of an arrangement of material specimens mounted in a 3-in.-deep peripheral tray. The effects of the space environment on the specimens will be determined by comparison of preflight and postflight measurements of mechanical, electrical, and optical properties.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 86-87
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  • 2
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    On the cause of the flat-spot phenomenon observed in silicon solar cells at low temperatures and low intensities (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A model that explains the flat-spot power loss phenomenon is presented. Evidence suggests that the effect is due to localized metallurgical interactions between the silicon substrate and the contact metallization. These reactions are shown to result in localized regions in which the P-N junction is destroyed and replaced with a metal semiconductor-like interface. The effects of thermal treatment, crystallographic orientation, junction depth, and metallization are shown along with a method of preventing the effect through the suppression of vacancy formation at the free surface of the contact metallization. Data indicating the effectiveness of a TiN diffusion barrier in preventing the effect are also given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ESA Photovoltaic Generators in Space; p 65-70
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  • 3
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    Advanced photovoltaic experiment (S0014) (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The advanced photovoltaics-related experiments for investigating a portion of the solar spectrum and the effect of the space environment on photovoltaics. The information will be used to provide correlation between space and ground testing and also to provide for more accurate performance measurement in the laboratory. Specific objectives of these experiments are to provide information on the performance and endurance of advanced and conventional solar cells, to improve reference standards for photovoltaic measurements, and to measure the energy distribution in the extraterrestrial solar spectrum. Data to be obtained will include temperatures and short-circuit current of the samples. Six-point current-voltage (I-V) characteristics will be obtained for selected samples. These data will be recorded once a day during the flight. Orbit data will be correlated with preflight and postflight measurement of the samples.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 88-90
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  • 4
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    Space Station Power System issues (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A number of attractive options are available for the Space Station Power System. These include a photovoltaic system or solar dynamic system for power generation, batteries or fuel cells for energy storage and ac or dc for power management and distribution. These options are being explored during the present preliminary design and definition phase of the Space Station Program. Final selections are presently targeted for January 1986.
    Keywords: SPACECRAFT PROPULSION AND POWER
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  • 5
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    Space station power system (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is pointed out that space station planning at NASA began when NASA was created in 1958. However, the initiation of the program for a lunar landing delayed the implementation of plans for a space station. The utility of a space station was finally demonstrated with Skylab, which was launched in 1972. In May 1982, the Space Station Task Force was established to provide focus and direction for space station planning activities. The present paper provides a description of the planning activities, giving particular attention to the power system. The initial space station will be required to supply 75 kW of continuous electrical power, 60 kW for the customer and 15 kW for space station needs. Possible alternative energy sources for the space station include solar planar or concentrator arrays of either silicon or gallium arsenide.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IEEE Transactions on Aerospace and Electronic Systems (ISSN 0018-9251); AES-20; 666-671
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  • 6
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    Space Station Power System Advanced Development (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The objectives of the Space Station Advanced Development Program are related to the development of a set of design options and/or new capabilities to support Space Station development and operation, taking into account also a quantification of the performance and risk of key state-of-the-art technologies, and a reduction of the cost and schedule risk in Space Station development. Attention is given to the photovoltaic power system, a solar dynamic system, and aspects of power management and distribution. A major issue will be the selection of the power generation system. In view of the advantages of the solar dynamic system, it is attempted to resolve issues associated with this system.
    Keywords: SPACECRAFT PROPULSION AND POWER
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  • 7
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    Recent developments in lightweight solar cell modules (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two types of lightweight solar cell modules were prepared. The goal is to achieve a module with a power to weight ratio of 350 watts per kilogram. Both structures use thin cells approximately 50 micrometers thick and glass covers approximately 75 micrometers thick. In one structure the glass is bonded to the module using 93-500 silicone adhesive; while the other relies on heat and pressure bonding using FEP as the adhesive. Specific powers of about 335 watts per kilogram were achieved.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Photovoltaic Res. and Technol.; p 345-349
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  • 8
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    Effect of ionizing radiation on ruby (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Optical absorption and electron paramagnetic resonance techniques used to study ionizing radiation effect on ruby lasers
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-TN-D-3379
    Format: application/pdf
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  • 9
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    Annular Electrode Improves Solar-Cell Welds (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved method of electrical-resistance welding of solar-cell inter-connections developed by using an annular welding-electrode shape. Improved weld electrode consists of two coaxial cylinders, outer one with annular cross section and inner one with circular cross section. Possible annular weld-electrode configurations result in better quality welds for interconnecting solar-array elements.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-13804 , NASA Tech Briefs (ISSN 0145-319X); 6; 4; P. 468
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  • 10
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    Method of making encapsulated solar cell modules (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electrical connections to solar cells in a module are made at the same time the cells are encapsulated for protection. The encapsulating material is embossed to facilitate the positioning of the cells during assembly.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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