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  • ENERGY PRODUCTION AND CONVERSION  (6)
  • 1
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    Photovoltaic conversion of laser power to electrical power (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Photovoltaic laser to electric converters are attractive for use with a space-based laser power station. The results of modeling studies for a silicon vertical junction converter used with a Nd laser are given. A computer code was developed for the model and this code was used to conduct a parametric study for a Si vertical junction converter consisting of one p-n junction irradiated with a Nd laser. These calculations predict an efficiency over 50 percent for an optimized converter.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center, Space Photovoltaic Research and Technology 1986. High Efficiency, Space Environment and Array Technology; p 133-144
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    NASA TECHNICAL REPORTS
  • 2
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    Mathematical modeling of a photovoltaic-laser energy converter for iodine laser radiation (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Space-based laser power systems will require converters to change laser radiation into electricity. Vertical junction photovoltaic converters are promising devices for this use. A promising laser for the laser power station is the t-C4F9I laser which emits radiation at a wavelength of 1.315 microns. This paper describes the results of mathematical modeling of a photovoltaic-laser energy converter for use with this laser. The material for this photovoltaic converter is Ga(53)In(47)As which has a bandgap energy of 0.94 eV, slightly below the energy of the laser photons (0.943 eV). Results of a study optimizing the converter parameters are presented. Calculated efficiency for a 1000 vertical junction converter is 42.5 percent at a power density of 1 x 10 to the 3d power w/sq cm.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-100482 , NAS 1.15:100482
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  • 3
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    Three-dimensional models of conventional and vertical junction laser-photovoltaic energy converters (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Three-dimensional models of both conventional planar junction and vertical junction photovoltaic energy converters have been constructed. The models are a set of linear partial differential equations and take into account many photoconverter design parameters. The model is applied to Si photoconverters; however, the model may be used with other semiconductors. When used with a Nd laser, the conversion efficiency of the Si vertical junction photoconverter is 47 percent, whereas the efficiency for the conventional planar Si photoconverter is only 17 percent. A parametric study of the Si vertical junction photoconverter is then done in order to describe the optimum converter for use with the 1.06-micron Nd laser. The efficiency of this optimized vertical junction converter is 44 percent at 1 kW/sq cm.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-4039 , L-16424 , NAS 1.15:4039
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  • 4
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    A theoretical study of photovoltaic converters (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The final phase of research was performed in the model simulation for the solar simulator pumped atomic iodine laser. The geometry for the steady state laser operation with axial lasant flow is illustrated. The chemical kinetics for this laser are described.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-180956 , NAS 1.26:180956
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  • 5
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    Mathematical optimization of photovoltaic converters for diode lasers (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The mathematical optimization of vertical-junction photovoltaic converters for use with diode laser arrays supplying powers up to 1 MW is discussed. Photovoltaic parameters were optimized using a mathematical model. The optimized converters have 500 single junctions connected in series. The efficiency varies from 41 percent for a 0.73-micron diode laser to 46 percent for a 0.83-micron diode laser. The optimum width of the single-junction converter is small, 3.0 microns, in order for the p-n junction to be within a diffusion length of the light-generated carriers. Another critical parameter is the series resistance; the optimum value of 0.001 ohms should be achievable. Another critical parameter is the donor carrier concentration, for which an optimum value of 5 x 10 to the 15th carriers/cu cm has been chosen.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IECEC-89; Aug 06, 1989 - Aug 11, 1989; Washington, DC; United States
    Format: text
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  • 6
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    A theoretical study of photovoltaic converters (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Mathematical models for the photovoltaic conversion of laser power were developed. These models simulate the operation of planar and vertical junction photovoltaic converters and are described in detail.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-180635 , NAS 1.26:180635
    Format: application/pdf
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