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  • 11
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    Opto-electronic properties of cells made from various silicon forms (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Opto-electronic properties of the various silicon forms were obtained from the solar cell performance. Performance parameters included the photovoltaic characteristics, minority carrier diffusion length, spectral response and small light spot scanning. Self consistent results were obtained from the various measurement techniques, which can provide useful information on sheet quality, as a potential for low cost terrestrial applications, and areas where the sheet formation methods can be improved.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Seminar on Role of electro-optics in photovoltaic energy conversion; Jul 31, 1980 - Aug 01, 1980; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Silicon solar cell process development, fabrication and analysis (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solar cells were fabricated from EFG ribbons dendritic webs, cast ingots by heat exchanger method, and cast ingots by ubiquitous crystallization process. Baseline and other process variations were applied to fabricate solar cells. EFG ribbons grown in a carbon-containing gas atmosphere showed significant improvement in silicon quality. Baseline solar cells from dendritic webs of various runs indicated that the quality of the webs under investigation was not as good as the conventional CZ silicon, showing an average minority carrier diffusion length of about 60 um versus 120 um of CZ wafers. Detail evaluation of large cast ingots by HEM showed ingot reproducibility problems from run to run and uniformity problems of sheet quality within an ingot. Initial evaluation of the wafers prepared from the cast polycrystalline ingots by UCP suggested that the quality of the wafers from this process is considerably lower than the conventional CZ wafers. Overall performance was relatively uniform, except for a few cells which showed shunting problems caused by inclusions.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163787 , DOE/JPL-955089-81/12 , JPL-9950-597
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    NASA TECHNICAL REPORTS
  • 13
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    Evaluation and optimization of silicon sheet solar cells (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the results and procedures to evaluate and improve the efficiency of solar cells made from various unconventional silicon sheets. The performance parameters included photovoltaic characteristics, spectral response, dark I-V characteristics, and diffusion length. The evaluation techniques used provided accurate and reliable information on sheet performance, and self-consistent results were obtained from the various measurement techniques used. Minority carrier diffusion length (L) was shown to be the ultimate limiting factor for the sheet cell performance (efficiency) and other back-up measurements confirmed this L-dependence. Limited efforts were made to identify defects which influence cell performance, and to use some improved process methods to increase cell efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; Jan 07, 1980 - Jan 10, 1980; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    Silicon solar cell process development, fabrication and analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163247 , DOE/JPL-995089-80/6 , QR-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Silicon solar cell process development, fabrication, and analysis (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two large cast ingots were evaluated. Solar cell performance versus substrate position within the ingots was obtained and the results are presented. Dendritic web samples were analyzed in terms of structural defects, and efforts were made to correlate the data with the performance of solar cells made from the webs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-164676 , DOE/JPL-955089-81/11 , JPL-9950580 , QR-9
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    NASA TECHNICAL REPORTS
  • 16
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    Silicon solar cell process development, fabrication, and analysis (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solar cells from HEM, Dendritic Webs, and EFG ribbons were fabricated and characterized. The HEM solar cells showed only slight enhancement in cell performance after gettering steps (diffusion glass) were added. Dendritic webs from various growth runs indicated that performance of solar cells made from the webs was not as good as that of the conventional CZ cells. The EFG ribbons grown in CO ambient showed significant improvement in silicon quality.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-164618 , DOE/JPL-955089-80/10 , JPL-9950-561 , QR-8
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  • 17
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    Silicon Solar Cell Process Development, Fabrication and Analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The standard solar cells (2x2 cm) from the cast silicon heatexchanger method) showed a maximum AMO efficiency of 10.1%. Cells from low resistivity material (0.5 ohm-cm) showed lower performance than those of the high resistivity cast silicon (3 ohm-cm), an average efficiency 9.5% versus 7.6% Maximum AMO efficiency of the standard solar cells (2x2 cm) from the EFG (RH) ribbons was about 7.5%. The solar cells from controlled SiC, using the displaced die, showed more consistent and better performance than those of the uncontrolled SiC ribbons, an average efficiency of 6.6% versus 5.4% The average AMO efficiency of the standard silicon ceramic (soc) solar calls were about 6%. These were large area solar cells (an average area of 15 sq cm). A maximum efficiency of 7.3% was obtained. The SOC solar cells showed both leakage and series resistance problems, leading to an average curve fill factor of about 60%.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158735 , DOE/JPL-955089-79/3 , QR-3
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  • 18
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    Silicon Solar Cell Process Development, Fabrication and Analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The standard solar cells (2x2 cm) from the cast silicon (HEM) showed a maximum AMO efficiency of 10.1%. Cells from the low resistivity material (0.5 ohm-cm) showed lower performance than those of the high resistivity cast silicon (3 ohm-cm), an average efficiency 9.5% versus 7.6%. Maximum AMO efficiency of the standard solar cells from the EFG (RH) ribbons was about 7.5%. The solar cells from the controlled SiC, using the displaced die, showed more consistent and better performance than those of the uncontrolled SiC ribbons, an average efficiency of 6.6% versus 5.4%. The average AMO efficiency of the standard SOC solar cells were about 6%. These were large area solar cells (an average area of 15 sq cm). A maximum efficiency of 7.3% was obtained. The SOC solar cells showed both leakage and series resistance problems, leading to an average curve fill factor of about 60%.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158736 , DOE/JPL-955089-79/4 , QR-3
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  • 19
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    Silicon Solar Cell Process Development, Fabrication and Analysis, Phase 1 (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solar cells from RTR ribbons, EFG (RF and RH) ribbons, dendritic webs, Silso wafers, cast silicon by HEM, silicon on ceramic, and continuous Czochralski ingots were fabricated using a standard process typical of those used currently in the silicon solar cell industry. Back surface field (BSF) processing and other process modifications were included to give preliminary indications of possible improved performance. The parameters measured included open circuit voltage, short circuit current, curve fill factor, and conversion efficiency (all taken under AM0 illumination). Also measured for typical cells were spectral response, dark I-V characteristics, minority carrier diffusion length, and photoresponse by fine light spot scanning. the results were compared to the properties of cells made from conventional single crystalline Czochralski silicon with an emphasis on statistical evaluation. Limited efforts were made to identify growth defects which will influence solar cell performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-162427 , DOE/JPL-955089-79/4 , DRL-74/DRD-SE
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  • 20
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    Silicon Solar Cell Process Development, Fabrication and Analysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ribbon to Ribbon (RTR) solar cells processed from polycrystalline feedstock showed maximum AMO efficiency of 5.6%. Solar cells from single crystalline feedstock showed slightly higher efficiency than those from polycrystalline feedstock, indicating maximum efficiency of about 6.6% with SiO AR coating. Single crystalline control cells gave 11-12% AMO efficiencies demonstrating that the poor performance of the RTR solar was due to the low quality of material itself. Dendritic web solar cells from the standard process showed maximum AMO efficiency of 9.8% while efficiency of control solar cells were around 11-12%. Web solar cells from back surface field (BSF) process indicated maximum AMO efficiency of 10.9%. Some improvement in open circuit voltage was noticed from the BSF process. Small light spot scanning experiments were carried out on the solar cells from Wacker Silso, EFG, RTR, and dendritic web ribbons. Photoresponse results provided information on localized cell performance and grain size in polycrystalline material, and agreed quite well with the cell performance data, such as efficiency, minority carrier diffusion length, and spectral response.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158363 , DOE/JPL-955089-79/1 , QR-2
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