Accession Number:

AD0691506

Title:

ENVIRONMENTAL ASSESSMENT OF THIN SILICON SOLAR CELLS FROM PILOT PRODUCTION

Descriptive Note:

Technical rept.

Corporate Author:

ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

Personal Author(s):

Report Date:

1969-01-01

Pagination or Media Count:

42.0

Abstract:

Following the earlier demonstration of the performance capabilities of 4 mil silicon solar cells and the feasibility of using these cells on large flexible arrays of space vehicles, more than a thousand 4 mil cells have been fabricated in pilot production by four routes. The various types of cells which have been evaluated had solderless evaporated titanium-silver contacts in both a conventional and wrap-round configuration, solderless evaporated titanium-silver contacts over-plated with a layer of copper-gold, and solderless plated nickel-copper-gold contacts in a conventional and wrap-round configuration. Both 1 x 2 and 2 x 2 cm, n on p cells have been manufactured from 1 and 10 ohm cm boron doped silicon. In every case, satisfactory production yields have been achieved. The above cells have been subjected to environmental conditions aimed at studying the effects of high ambient humidity on the cell contacts during shelf-life prior to launch and the degradation in performance from electron and proton irradiation encountered during long term spiral transfer orbits to synchronous altitude. Specifically the problem of low energy synchronous altitude proton irradiation of exposed bar and back contacts and the protection afforded by various forms of coatings has been investigated.

Subject Categories:

  • Electric Power Production and Distribution
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE