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Development of a high efficiency thin silicon solar cellOne hundred thin (120 microns to 260 microns) silicon-aluminum solar cells were fabricated and tested. Silicon slices were prepared, into which an aluminum alloy was evaporated over a range of temperatures and times. Antireflection coatings of tantalum oxide were applied to the cells. Reflectance of the silicon-aluminum interfaces was correlated to alloy temperature (graphs are shown). Optical measurements of the rear surface-internal reflectance of the cells were performed using a Beckman spectrophotometer. An improved gridline pattern was evaluated and stability tests (thermal cycling tests) were performed. Results show that: (1) a high-index, high-transmittance antireflection coating was obtained; (2) the improved metallization of the cells gave a 60 percent rear surface-internal reflectance, and the cells displayed excellent fill factors and blue response of the spectrum; (3) an improved gridline pattern (5 micron linewidths compared to 13 micron linewidths) resulted in a 1.3 percent improvement in short circuit currents; and (4) the stability tests showed no change in cell properties.
Document ID
19760013553
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lindmayer, J. (Solarex Corp. Rockville, MD, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1976
Subject Category
Energy Production And Conversion
Report/Patent Number
QR-2
SX/105/2Q
NASA-CR-146770
Accession Number
76N20641
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: JPL-954290
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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