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  • 1
    Electronic Resource
    Electronic Resource
    Analytic calculation of cation distributions in ferrite spinel Mn"1"-"γFe"2" "+" "γO"4
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 49 (1988), S. 761-766 
    Details
    ISSN: 0022-3697
    Keywords: Manganese ferrite ; cation distributions ; defect thermodynamics ; electrical resistivity ; magnetic ferrite ; thermoelectric power
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(88)90025-X
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Correlation of solar cell electrical properties with material characteristics of silicon cast by the ubiquitous crystallization process (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Solar cells were fabricated using a conservative 'baseline' process on 1-3 Omega-cm p-type silicon from ingots cast by the ubiquitous crystallization process. Conversion efficiencies of the cells were measured, as well as spectral response and minority carrier diffusion length. Adjacent slices from the same ingot were studied for their grain size, dislocation distribution, and impurity distribution. Cell performance was related to the observed structural features, as well as to the chemical structure of the ingot.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Electrochemical Society, Journal (ISSN 0013-4651); 130; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Field experience with various slicing methods (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Wafer slicing using internal diameter (ID) saw, multiblade slurry (MBS) saw and multiwire slurry (MWS) saw techniques were evaluated. Wafer parameters such as bow, taper, and roughness which may not be important factors for solar cell fabrication, were considerably better for ID saw than those of the MBS and MWS saw. Analysis of add-on slicing cost indicated that machine productivity seems to be a major limiting factor for ID saw, while expendible material costs are a major factor for both MBS and MWS saw. Slicing experience indicated that the most important factors controling final wafer cost are: (1) silicon cost (wafer thickness + kerf loss); (2) add-on slicing cost, and (3) mechanical yield. There is a very strong interaction between these parameters, suggesting a necessity of optimization of these parameters.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the Low-Cost Solar Array Wafering Workshop; p 179-185
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Improved performance from solar cells made from candidate sheet silicon materials (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Performance of solar cells made from various candidate silicon sheets is updated and the results are presented. Solar cells were fabricated using a baseline process and other process variations, and tested under AM1 conditions. Performance of the baseline solar cells indicates that remarkable improvements in material quality have been achieved for most of the sheets, showing efficiencies close to that of the control cells made from conventional CZ silicon. Process variations (or additions), in general, have resulted in significant improvements in all performance with a degree of change dependent on the process chosen and to a certain extent the sheet quality.
    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
  • 5
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    Current status of solar cell performance of unconventional silicon sheets (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that activities in recent years directed towards reduction in the cost of silicon solar cells for terrestrial photovoltaic applications have resulted in impressive advancements in the area of silicon sheet formation from melt. The techniques used in the process of sheet formation can be divided into two general categories. All approaches in one category require subsequent ingot wavering. The various procedures of the second category produce silicon in sheet form. The performance of baseline solar cells is discussed. The baseline process included identification marking, slicing to size, and surface treatment (etch-polishing) when needed. Attention is also given to the performance of cells with process variations, and the effects of sheet quality on performance and processing.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: Photovoltaic Solar Energy Conference; Oct 27, 1980 - Oct 31, 1980; Cannes; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Silicon solar cell process development, fabrication, and analysis (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Work has progressed in fabrication and characterization of solar cells from ubiquitous crystallization process (UCP) wafers and LASS ribbons. Gettering tests applied to UCP wafers made little change on their performance compared with corresponding baseline data. Advanced processes such as shallow junction (SJ), back surface field (BSF), and multilayer antireflection (MLAR) were also applied. While BSF by Al paste had shunting problems, cells with SJ and BSF by evaporated Al, and MLAR did achieve 14.1% AMI on UCP silicon. The study of LASS material was very preliminary. Only a few cells with SJ, BSR, (no BSF) and MLAR were completed due to mechanical yield problems after lapping the material. Average efficiency was 10.7% AMI with 13.4% AMI for CZ controls. Relatively high minority carrier diffusion lengths were obtained. The lower than expected Jsc could be partially explained by low active area due to irregular sizes.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168670 , DOE/JPL-955089-81/12 , JPL-9950-638 , NAS 1.26:168670 , QR-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Silicon solar cell process. Development, fabrication and analysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solar cells were fabricated from unconventional silicon sheets, and the performances were characterized with an emphasis on statistical evaluation. A number of solar cell fabrication processes were used and conversion efficiency was measured under AMO condition at 25 C. Silso solar cells using standard processing showed an average efficiency of about 9.6%. Solar cells with back surface field process showed about the same efficiency as the cells from standard process. Solar cells from grain boundary passivation process did not show any improvements in solar cell performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158035 , DOE/JPL-955089-78/10 , QR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Characterization of CdS/CdTe and CdS/CuInSe2 thin film solar cells (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study on low cost polycrystalline thin film CdS/CdTe and CdS/CuInSe2 solar cells using measurements of spectral response and capacitance-voltage-frequency relationships was performed. Because of high concentrations of localized levels in the energy gap existing in materials and at interfaces, the redistribution of charge among the levels due to illumination plays an important role in the collection of light-generated current in these cells. The results illustrate some related phenomena observed in these cells.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 01, 1984 - May 04, 1984; Kissimmee, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Diagnostic study of BSF silicon solar cells (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Solar cells equipped with back surface fields (BSF) were fabricated by means of an aluminum alloy, boron diffusion, and boron ion implantation. The importance of initial thickness, resistivity, orientation, and the crystal growth method were examined. Aluminum in paste form was screen printed on the cell, followed by alloy formation at 800 C for a minute. Application of the BSFs resulted in open circuit voltage improvements dependent on the substrate resistivity, ranging from 10 mV at 0.3 ohm-cm to 50 mV at 15 ohm-cm. The gains in performance were attributed to a longer penetration depth, a heightened concentration profile at the interface, and higher concentrations in the p+ layer.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Symposium on Materials and New Processing Technologies for Photovoltaics; Oct 01, 1980; Hollywood, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Silicon solar cell process development, fabrication and analysis (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-16409 , QR-7 , JPL-9950510 , DOE/JPL-955089-80/9
    Format: text
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    NASA TECHNICAL REPORTS
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