Accession Number : AD0902834

Title :   Manufacturing Methods for Silicon Solar Cells with Integral Coverslips.

Descriptive Note : Final technical progress rept. 1 Jun 70-30 Mar 72,

Corporate Author : HELIOTEK SYLMAR CA

Personal Author(s) : Somberg, Howard ; Scott-Monck, John A. ; Avery, James E. ; Payne, Patricia A.

Report Date : JUL 1972

Pagination or Media Count : 102

Abstract : A pilot production line employing both an 18 and 42 inch diameter vacuum system was run producing 1600 cells with integral covers up to 150 micrometers thickness. Cells with 50 micrometers covers yielded approx 10 percent average efficiency under AMO, 28 C, conditions while 100 micrometers covers showed greater than 9 percent efficiency. These cells successfully passed typical space type thermal cycling and high temperature storage tests. The integral cover demonstrated behavior at least equivalent to conventional fused silica covers when subjected to 1 MeV electrons and ultraviolet radiation. Electron beam evaporation techniques were used to rapidly deposit up to 150 micrometers thick integral covers. The aluminosilicate glass source material yielded highly transparent (>90 percent transmission) covers provided the glass was premelted to remove volatile materials and then deposited with a background oxygen pressure of approx 0.00005 torr. Cover stresses of approx 3 x 10 to the 8th power dynes/sq cm were routinely achieved by using high condensation rates (approx 300 A/sec.). The stress was shown to be inversely related to condensation rate, but the high oxygen background pressures necessary for good optical transmission prevented higher rates from being achieved. A new TiO antireflection coating, better matched for glass covers than SiO, was implemented.

Descriptors :   (*SOLAR CELLS, MANUFACTURING), HARDENING, SILICON, OPTICAL COATINGS, TITANIUM COMPOUNDS, MONOXIDES, ALUMINUM COMPOUNDS, SILICATES, DEPOSITION, EVAPORATION, ELECTRON BEAMS, ELECTRON IRRADIATION, ULTRAVIOLET RADIATION, REFLECTION.

Subject Categories : Electric Power Production and Distribution
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE