Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977

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A process sequence is proposed and analyzed with regard to yield and cost of direct materials for fabrication. Cells of at least 13% conversion efficiency and panels of 10% efficiency have been assumed. Material costs, excluding silicon, were estimated as low as $0.19/watt (1975). Use of the JPL Interim Price Estimation Guidelines gives a projected contribution to selling price of $0.24/watt (1975) for the direct materials used in processing. If silicon is included, the contribution to selling price is $0.46/watt (1975). Development effort during this quarter has been applied to junction information, anti-reflection coating and laser scribing. Junction formation effort … continued below

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31 pages

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Szedon, J. R.; Campbell, R. B.; Ghoshtagore, R. N. & Yoldas, B. E. April 26, 1978.

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A process sequence is proposed and analyzed with regard to yield and cost of direct materials for fabrication. Cells of at least 13% conversion efficiency and panels of 10% efficiency have been assumed. Material costs, excluding silicon, were estimated as low as $0.19/watt (1975). Use of the JPL Interim Price Estimation Guidelines gives a projected contribution to selling price of $0.24/watt (1975) for the direct materials used in processing. If silicon is included, the contribution to selling price is $0.46/watt (1975). Development effort during this quarter has been applied to junction information, anti-reflection coating and laser scribing. Junction formation effort was in two areas: (1) establishing the process parameter ranges for the back surface diffusion from a boron-doped oxide and for the front junction diffusion using POCl/sub 3/ and (2) determining if the purity of the POCl/sub 3/ source material is critical to cell performance. Anti-reflection coatings of TiO/sub 2/ have been prepared on cells formed in dendritic web silicon by spin-on application of a liquid metallo-organic precursor.Achievement of 12 to 13% conversion efficiency after single layer coating was common. Laser scribing to remove dendrites from the ribbon and to delineate cell areas has been demonstrated. The presence of photoresist, AR or metallic films on the ribbons does not significantly affect scribing. Laser scribing has been found to degrade cell performance, presumably by damaging the front collecting junction. Proper control of laser penetration during back-surface scribing is expected to solve this problem.

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31 pages

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Dep. NTIS, PC A03/MF A01.

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  • April 26, 1978

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  • July 3, 2018, 8:14 a.m.

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Thumbnail image of item number 1 in: 'Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977'.
Thumbnail image of item number 2 in: 'Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977'.
Thumbnail image of item number 3 in: 'Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977'.
Thumbnail image of item number 4 in: 'Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977'.

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Szedon, J. R.; Campbell, R. B.; Ghoshtagore, R. N. & Yoldas, B. E. Phase 2 of the Array Automated Assembly Task for the Low Cost Silicon Solar Array Project. First quarterly report, October 1, 1977--December 31, 1977, report, April 26, 1978; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc1196471/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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