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  • 1
    Electronic Resource
    Electronic Resource
    The effects of glucocorticoids on thymidine kinase and nucleoside phosphotransferase during development of chicken embryo retina
    Amsterdam : Elsevier
    FEBS Letters 164 (1983), S. 166-170 
    Details
    ISSN: 0014-5793
    Keywords: Development ; Glucocorticoid ; Nucleoside phosphotransferase ; Retina ; Thymidine kinase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(83)80042-8
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Short-circuit current improvement in thin cells with a gridded back contact (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The use of gridded back contact on thin silicon solar cells 50 micrometers was investigated. An unexpected increase in short circuit current of almost 10 percent was experienced for 2 cm x 2 cm cells. Control cells with the standard continuous contact metallization were fabricated at the same time as the gridded back cells with all processes identical up to the formation of the back contact. The gridded back contact pattern was delineated by evaporation of Ti-Pd over a photo-resist mask applied to the back of the wafer; the Ti-Pd film on the controls was applied in the standard fashion in a continuous layer over the back of the cell. The Ti-Pd contacts were similarly applied to the front of the wafer, and the grid pattern on both sides of the cell was electroplated with 8-10 micrometers of silver.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center Space Photovoltaic Res. and Technol.; p 67-70
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The gridded back contact and its effect on solar cell performance (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effect of using gridded back contacts on silicon solar cells made with Al baked surface field (BSF) was experimentally investigated and found to result in a significant increase in conversion efficiency due to higher short-circuit current. An increase of 5 to 8% was noted for thin cells while a smaller increase was observed for standard thickness cells. Several possible explanatory mechanisms are suggested and summarized, including stress relief, incomplete BSF formation, improved back surface recombination velocity, and improved optical reflection off the back silicon-air interface.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Coplanar back contacts for thin silicon solar cells (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The type of coplanar back contact solar cell described was constructed with interdigitated n(+) and p(+) type regions on the back of the cell, such that both contacts are made on the back with no metallization grid on the front. This cell construction has several potential advantages over conventional cells for space use namely, convenience of interconnects, lower operating temperatures and higher efficiency due to the elimination of grid shadowing. However, the processing is more complex, and the cell is inherently more radiation sensitive. The latter problem can be reduced substantially by making the cells very thin (approximately 50 micrometers). Two types of interdigitated back contact cells are possible, the types being dependent on the character of the front surface. The front surface field cell has a front surface region that is of the same conductivity type as the bulk but is more heavily doped. This creates an electric field at the surface which repels the minority carriers. The tandem junction cell has a front surface region of a conductivity type that is opposite to that of the bulk. The junction thus created floats to open circuit voltage on illumination and injects carriers into the bulk which then can be collected at the rear junction. For space use, the front surface field cell is potentially more radiation resistant than the tandem junction cell because the flow of minority carriers (electrons) into the bulk will be less sensitive to the production of recombination centers, particularly in the space charge region at the front surface.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-165272
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Analysis of the effects of impurities in silicon (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A solar cell fabrication and analysis program was conducted to determine the effects on the resultant solar cell efficiency of impurities intentionally incorporated into silicon. It was found that certain impurities such as titanium, tantalum, and vanadium were bad, even in very small concentrations. Cell performance appeared relatively tolerable to impurities such as copper, carbon, calcium, chromium, iron and nickel (in the concentration levels which were considered).
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163133 , DOE/JPL-955307 , JPL-9950-325
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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