Fabrication of stable, large-area thin-film CdTe photovoltaic modules. Final subcontract report, May 10, 1991--February 28, 1995

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During the period of this subcontract, May 1991 through February 1995, Solar Cells, Inc. has developed and demonstrated a low-cost process to fabricate stable large-area cadmium telluride based thin-film photovoltaic modules. This report summarizes the final phase of the project which is concentrated on process optimization and product life tests. One of the major post-deposition process steps, the CdCl{sub 2} heat treatment, has been experimentally replaced with alternative treatments with vapor chloride or chlorine gas. Material and device qualities associated with alternative treatments are comparable or superior to those with the conventional treatment. Extensive experiments have been conducted to optimize ... continued below

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32 p.

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Zhou, T.X. June 1, 1995.

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  • Zhou, T.X. Solar Cells, Inc., Toledo, OH (United States)

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Description

During the period of this subcontract, May 1991 through February 1995, Solar Cells, Inc. has developed and demonstrated a low-cost process to fabricate stable large-area cadmium telluride based thin-film photovoltaic modules. This report summarizes the final phase of the project which is concentrated on process optimization and product life tests. One of the major post-deposition process steps, the CdCl{sub 2} heat treatment, has been experimentally replaced with alternative treatments with vapor chloride or chlorine gas. Material and device qualities associated with alternative treatments are comparable or superior to those with the conventional treatment. Extensive experiments have been conducted to optimize the back-electrode structure in order to ensure long term device stability. Numerous small-area cells and minimodules have been subjected to a variety of stress tests, including but not limited to continuous light soak under open or short circuit or with resistive load, for over 10,000 hours. Satisfactory stability has been demonstrated on 48 cm{sup 2} and 64 cm{sup 2} minimodules under accelerated tests and on 7200 cm{sup 2} large modules under normal operating conditions. The conversion efficiency has also been significantly improved during this period. The total area efficiency of 7200 cm{sup 2} module has reached 8.4%, corresponding to a 60.3W normalized output; the efficiency of 64 cm{sup 2} minimodules and 1.1 cm{sup 2} cells has reached 10.5% (aperture area) and 12.4% (total area), respectively.

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32 p.

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OSTI as DE95009222

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  • Other Information: PBD: Jun 1995

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  • Other: DE95009222
  • Report No.: NREL/TP--413-7991
  • Grant Number: AC36-83CH10093
  • DOI: 10.2172/70752 | External Link
  • Office of Scientific & Technical Information Report Number: 70752
  • Archival Resource Key: ark:/67531/metadc708814

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  • June 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 8:10 p.m.

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Zhou, T.X. Fabrication of stable, large-area thin-film CdTe photovoltaic modules. Final subcontract report, May 10, 1991--February 28, 1995, report, June 1, 1995; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc708814/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.