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  • 1
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    Flight data from the PASP-Plus experiment (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The photovoltaic array space power (PASP)-Plus solar cell flight experiment is described, and the observed performances of different solar cell types during the first six months of their operation, are summarized. The solar cell types include single crystal and amorphous silicon, GaAs, several multijunction cell types, indium phosphide and GaAs/GaSb concentrator cells. The radiation degradation experienced by some of the solar cell types agrees with theoretical predictions. Other samples, including silicon, are degraded less than predicted. Effects, including the increase in temperature of all the experiments and the effect of sun glint on cell measurement, are discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ESA, Proceedings of 4th European Space Power Conference (ESPC). Volume 2: Photovoltaic Generators, Energy Storage; p 578-592
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radiation effects in heteroepitaxial InP solar cells (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Heteroepitaxial InP solar cells, with GaAs substrates, were irradiated by 0.5 and 3 MeV protons and their performance, temperature dependency, and carrier removal rates determined as a function of fluence. The radiation resistance of the present cells was significantly greater than that of non-heteroepitaxial InP cells at both proton energies. A clear difference in the temperature dependency of V(sub oc), was observed between heteroepitaxial and homoepitaxial InP cells. The analytically predicted dependence of dV(sub oc)/dT on Voc was confirmed by the fluence dependence of these quantities. Carrier removal was observed to increase with decreasing proton energy. The results obtained for performance and temperature dependency were attributed to the high dislocation densities present in the heteroepitaxial cells while the energy dependence of carrier removal was attributed to the energy dependence of proton range.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Proceedings of the 12th Space Photovoltaic Research and Technology Conference (SPRAT 12); p 16-22
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Solar electric propulsion for Mars transport vehicles (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Solar electric propulsion (SEP) is an alternative to chemical and nuclear powered propulsion systems for both piloted and unpiloted Mars transport vehicles. Photovoltaic solar cell and array technologies were evaluated as components of SEP power systems. Of the systems considered, the SEP power system composed of multijunction solar cells in an ENTECH domed fresnel concentrator array had the least array mass and area. Trip times to Mars optimized for minimum propellant mass were calculated. Additionally, a preliminary vehicle concept was designed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-103234 , E-5654 , NAS 1.15:103234
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    NASA TECHNICAL REPORTS
  • 4
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    23.5 percent thin-film space concentrator cells (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Thin-film AlGaAs-GaAs double-heterostructure concentrator cells were fabricated which exhibit total-area conversion efficiencies as high as 23.5 percent AM0 at 100 suns, 25 C. This is one of the best space concentrators measured to date at NASA and is designed for a thin-film cell without a prismatic coverglass. This solar cell structure consists of a GaAs/AlGaAs film less than 5 micron thick mounted to a glass cover/superstrate, with coplanar back-side contacts. The coverglass is not prismatic. The CLEFT process, a method for mechanically separating epitaxial layers from their substrate, is used to process these cells into thin films. The advantages of single-crystal GaAs are thereby retained, while reducing weight and cutting cost by allowing for substrate reuse. Thin-film cells also have better thermal management capabilities and can be stacked for use in tandem structures. Cell fabrication and performance are described, and directions for further improvements are identified.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IEEE Photovoltaic Specialists Conference; May 21, 1990 - May 25, 1990; Kissimmee, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Lightweight concentrator module with 30 percent AM0 efficient GaAs/GaSb tandem cells (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A concept is presented for an aerospace concentrator module with lightweight domed lenses and 30 percent AM0 efficient GaAs/GaSb tandem solar cell circuits. The performance of transparent GaAs cells is reviewed. NASA's high-altitude jet flight calibration data for recent GaSb cells assembled with bulk GaAs filters are reported, along with subsequent Boeing and NASA measurements of GaSb I-V performance at various light levels and temperatures. The expected performance of a basic two-terminal tandem concentrator circuit with three-to-one voltage matching is discussed. All of the necessary components being developed to assemble complete flight test coupons are shown. Straightforward interconnect and assembly techniques yield voltage matched circuits with near-optimum performance over a wide temperature range.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IEEE Photovoltaic Specialists Conference; May 21, 1990 - May 25, 1990; Kissimmee, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Thermal annealing of GaAs concentrator solar cells (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The thermal annealing of GaAs concentrator cells after electron irradiation is reported. Results are given for cells annealed at 150, 200, and 250 C. Isochronal annealing was done for 20 min intervals up to 350 C. For cells irradiated with electrons of energies between 0.7 and 2.3 MeV, the recovery decreases with increasing electron energy. Isothermal and isochronal annealing produce the same recovery. Cells irradiated to 3 x 10 to the 15th or 1 x 10 to the 16th e/sq cm recover to similar unannealed fractions. Significant annealing is seen starting at 150 C, although very long times are required.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC-89; Aug 06, 1989 - Aug 11, 1989; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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