Photovoltaic mechanisms in polycrystalline thin film solar cells. Quarterly technical progress report No. 4, July 1-September 30, 1979

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A more detailed model of the vertical junction effect was generated which investigates both the increase in light generated current due to enhanced collection at the grain boundary and the increase in dark current due to the increased junction area. Results show that there is an overall increase in the cell's maximum power; however, the increase in power is negligible for grain widths exceeding a few tenths of a millimeter. Solar cells were fabricated on a longitudinal section of cast polysilicon which was analyzed crystallographically by means of x-ray diffraction patterns. Special crystallographic orientation relationships are identified for the relative ... continued below

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Pages: 51

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Storti, G.; Johnson, S.; Lin, H.C. & Armstrong, R.W. January 1, 1979.

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A more detailed model of the vertical junction effect was generated which investigates both the increase in light generated current due to enhanced collection at the grain boundary and the increase in dark current due to the increased junction area. Results show that there is an overall increase in the cell's maximum power; however, the increase in power is negligible for grain widths exceeding a few tenths of a millimeter. Solar cells were fabricated on a longitudinal section of cast polysilicon which was analyzed crystallographically by means of x-ray diffraction patterns. Special crystallographic orientation relationships are identified for the relative orientations of adjacent grains and for the alignment of their boundary interfaces along certain planar segments. The dark I-V characteristics of the polysilicon cells were dominated by recombination within the space-charge region. Scanning photoresponse patterns are matched with the microstructural information to show, in the absence of any detectable impurity effects, that an insignificant or reduced photoresponse measurement is associated with certain boundaries depending on their structural character. The special orientations of grains are indicated on the basis of a model example to be derived from single or multiple twinning relationships on (111) systems.

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Pages: 51

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Dep. NTIS, PC A04/MF A01.

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  • Report No.: DSE-3413-T3
  • Grant Number: ET-78-C-01-3413
  • DOI: 10.2172/5600780 | External Link
  • Office of Scientific & Technical Information Report Number: 5600780
  • Archival Resource Key: ark:/67531/metadc1087429

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  • January 1, 1979

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  • Feb. 10, 2018, 10:06 p.m.

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  • April 11, 2018, 6:14 p.m.

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Storti, G.; Johnson, S.; Lin, H.C. & Armstrong, R.W. Photovoltaic mechanisms in polycrystalline thin film solar cells. Quarterly technical progress report No. 4, July 1-September 30, 1979, report, January 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1087429/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.