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  • ENERGY PRODUCTION AND CONVERSION  (9)
  • 2020-2023
  • 1985-1989  (9)
  • 1960-1964
  • 1945-1949
  • 1940-1944
  • 1
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    Performance of AlGaAs, GaAs and InGaAs cells after 1 MeV electron irradiation (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Electron irradiations were made on three different types of III-V cells. AlGaAs, GaAs, and InGaAs cells with bandgaps of approximately 1.72, 1.43, and 1.1 eV, respectively, were tested. All of the cells were concentrator cells and performance data from one sun to beyond 100x AMO were taken. The total 1 MeV electron fluence was 3 times 10 to the 15th power e/square cm with data taken at several intermediate fluences. Cell performance is presented as a function of electron fluence for various concentration ratios and two different temperatures (25 and 80 C). Since these three cell types are potential candidates for the individual cells in a cascade structure, it is possible to calculate the loss in performance of cascade cells under 1 MeV irradiation. Data are presented which show the calculated performance of both series-connected and separately connected cascade cells.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Space Photovoltaic Research and Technology 1986. High Efficiency, Space Environment and Array Technology; p 223-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Bipolar nickel-hydrogen battery development (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A comparison of the bipolar Ni-H2 battery with other energy systems to be used in future high-power space systems is presented. The initial design for the battery under the NASA-sponsored program is described and the candidate stack components are evaluated, including electrodes, separator, electrolyte reservoir plate, and recombination sites. The compressibility of the cell elements, electrolyte activation, and thermal design are discussed. Manufacturing and prototype test results are summarized.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Test results of a 60 volt bipolar nickel-hydrogen battery (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In July, l986, a high-voltage nickel-hydrogen battery was assembled at the NASA Lewis Research Center. This battery incorporated bipolar construction techniques to build a 50-cell stack with approximately 1.0 A-hr capacity (C) and an open-circuit voltage of 65 V. The battery was characterized at both low and high current rates prior to pulsed and nonpulsed discharges. Pulse discharges at 5 and 10 C were performed before placing the battery on over 1400, 40% depth-of-discharge, low-earth-orbit cycles. The successful demonstration of a high-voltage bipolar battery in one containment vessel has advanced the technology to where nickel-hydrogen high-voltage systems can be constructed of several modules instead of hundreds of individual cells.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-89927 , E-3631 , NAS 1.15:89927 , AIAA PAPER 87-9262
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    NASA TECHNICAL REPORTS
  • 4
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    Radiation performance of AlGaAs concentrator cells and expected performance of cascade structures (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Aluminum gallium arsenide, GaAs, silicon and InGaAs cells have been irradiated with 1 MeV electrons and 37 MeV protons. These cells are candidates for individual cells in a cascade structure. Data is presented for both electron and proton irradiation studies for one sun and a concentration level of 100X AMO. Results of calculations on the radiation resistance of cascade cell structures based on the individual cell data are also presented. Both series connected and separately connected structures are investigated.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-100145 , E-3697 , NAS 1.15:100145
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    NASA TECHNICAL REPORTS
  • 5
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    Performance of GaAs concentrator cells under electron irradiations from 0.4 to 2.3 MeV (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Gallium arsenide concentrator cells were irradiated with electrons with energies varying from 0.4 to 2.3 MeV, and their electrical performance was measured. The cells are 5 x 5 mm square with a 4-mm diameter illuminated area. At each of four different electron energy levels (0.4, 0.7, 1.0, and 2.3 MeV), three n/p and two p/n cells were irradiated. I-V performance measurements were made prior to irradiation and at several intermediate fluence levels. The final fluence level was 3 X 10 to the 15th e/sq cm. It is concluded that the power degradation is independent of the temperature at which it is measured.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Sept. 26-30, 1988; Las Vegas, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    InP homojunction solar cell performance on the LIPS III flight experiment (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Performance data for the NASA Lewis Research Center indium phosphide n+p homojunction solar cell module on the LIPS 3 flight experiment is presented. The objective of the experiment is to measure the performance of InP cells in the natural radiation environment of the 1100 km altitude, 60+ deg inclination orbit. Analysis of flight data indicates that the performance of the four cells throughout the first year is near expected values. No degradation in short-circuit current was seen, as was expected from radiation tolerance studies of similar cells. Details of the cell structure and flight module design are discussed. The results of the temperature dependency and radiation tolerance studies necessary for normalization and analysis of the data are included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Sept. 26-30, 1988; Las Vegas, NV; United States
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    NASA TECHNICAL REPORTS
  • 7
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    High altitude current-voltage measurement of GaAs/Ge solar cells (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Measurements of high-voltage (Voc of 1.2 V) gallium arsenide on germanium tandem junction solar cells at air mass 0.22 showed that the insolation in the red portion of the solar spectrum is insufficient to obtain high fill factor. On the basis of measurements in the LeRC X-25L solar simulator, these cells were believed to be as efficient as 21.68 percent AM0. Solar simulator spectrum errors in the red end allowed the fill factor to be as high as 78.7 percent. When a similar cell's current-voltage characteristic was measured at high altitude in the NASA Lear Jet Facility, a loss of 15 percentage points in fill factor was observed. This decrease was caused by insufficient current in the germanium bottom cell of the tandem stack.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE Photovoltaic Specialists Conference; Sept. 26-30, 1988; Las Vegas, NV; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Airborne tracking sunphotometer apparatus and system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An airborne tracking Sun photometer apparatus has a rotatable dome. An azimuth drive motor is connected to rotate the dome. The dome has an equatorial slot. A cylindrical housing is pivotally mounted inside the dome at the equatorial slot. A photometer is mounted in the housing to move in the equatorial slot as the housing pivots. The photometer has an end facing from the slot with an optical flat transparent window. An elevation drive motor is connected to pivot the cylindrical housing. The rotatable dome is mounted in the bulkhead of an aircraft to extend from the interior of the aircraft. A Sun sensor causes the photometer to track the Sun automatically. Alternatively, the photometer may be oriented manually or by computer.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    InP homojunction solar cell performance on the LIPS 3 flight experiment (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Performance data for the NASA Lewis Research Center indium phosphide n+p homojunction solar cell module on the LIPS 3 Flight Experiment is presented. The objective of the experiment is to measure the performance of InP cells in the natural radiation environment of the 1100 km altitude, 60+ deg inclination orbit. Analysis of flight data indicates that the performance of the four cells throughout the first year is near expected values. No degradation in short-circuit current was seen, as was expected from radiation tolerance studies of similar cells. Details of the cell structure and flight module design are discussed. The results of the temperature dependency and radiation tolerance studies necessary for normalization and analysis of the data are included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-101390 , E-4454 , NAS 1.15:101390 , Photovoltaic Specialists Conference; Sep 26, 1988 - Sep 30, 1988; Las Vegas, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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