Photovoltaic Czochralski silicon manufacturing technology improvements. Annual subcontract report, 1 April 1993--31 March 1994

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Description

This report describes work performed under a 3-year, 3-phase, cost-share contract to demonstrate significant cost reductions and improvements in manufacturing technology. The objective of the program is to reduce costs in photovoltaic manufacturing by approximately 10% per year. The work was focused in three main areas: (1) silicon crystal growth and thin wafer technology; (2) silicon cell processing; and (3) silicon module fabrication and environmental, safety, and health issues. During this reporting period, several significant improvements were achieved. The crystal growing operation improved significantly with an increase in growth capacity due to larger crucibles, higher polysilicon packing density, and high ... continued below

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19 p.

Creation Information

Jester, T. March 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

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  • Jester, T. Siemens Solar Industries, Camarillo, CA (United States)

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Description

This report describes work performed under a 3-year, 3-phase, cost-share contract to demonstrate significant cost reductions and improvements in manufacturing technology. The objective of the program is to reduce costs in photovoltaic manufacturing by approximately 10% per year. The work was focused in three main areas: (1) silicon crystal growth and thin wafer technology; (2) silicon cell processing; and (3) silicon module fabrication and environmental, safety, and health issues. During this reporting period, several significant improvements were achieved. The crystal growing operation improved significantly with an increase in growth capacity due to larger crucibles, higher polysilicon packing density, and high pull speeds. Wafer processing with wire saws progressed rapidly, and the operation is completely converted to wire saw wafer processing. The wire saws yield almost 50% more wafers per inch in production, thus improving manufacturing volume by 50% without any additional expense in crystal growth. Cell processing improvements focused on better understanding the contact paste and firing processes. Module designs for lower material and labor costs began with the focus on a new junction box, larger modules with larger cells, and a less costly framing technique. In addition, chlorofluorocarbon (CFC) usage was completely eliminated in the Siemens manufacturing facility during this period, resulting in significant reductions in the cost of caustic waste treatment.

Physical Description

19 p.

Notes

OSTI as DE95004066

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  • Other Information: PBD: Mar 1995

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  • Other: DE95004066
  • Report No.: NREL/TP--411-7498
  • Grant Number: AC36-83CH10093
  • DOI: 10.2172/41327 | External Link
  • Office of Scientific & Technical Information Report Number: 41327
  • Archival Resource Key: ark:/67531/metadc682814

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  • March 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • March 31, 2016, 8:59 p.m.

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Jester, T. Photovoltaic Czochralski silicon manufacturing technology improvements. Annual subcontract report, 1 April 1993--31 March 1994, report, March 1, 1995; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc682814/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.