Solar cell having multiple p-n junctions and process for produci

Details Solar cell having multiple p-n junctions and process for produci Solar cell having multiple p-n junctions and process for produci

1980-08-06

1982-03-16

Weisstuch, Aaron

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

29572, 148 15, 148176, 357 30, 136261, H01L 3106, H01L 3118

Patent

active

043202470

ABSTRACT:
A solar cell with improved energy conversion characteristics is formed from ordinary Czochralski or other types of silicon crystals that are sliced parallel to the growth axis or pulling direction. The slices are heat treated at a sufficiently high temperature and for a sufficiently long period of time to activate oxygen donor states in the slices. The heat treatment is of sufficient duration that at periodic maxima of oxygen concentration in the crystal it produces n-type regions where a background p-type dopant is overcompensated. Each n-type region thus formed is adjacent to a p-type region with a p-n junction therebetween. Collector contacts are applied at the faces of the slices to permit collection of carriers.

REFERENCES:
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patent: 4136435 (1979-01-01), Li
patent: 4153476 (1979-05-01), Shezpuk
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T. B. S. Chadda et al., "Comparison of Vertical Multijunction & Conventional Solar Cell Performance," Conf. Record, 10th IEEE Photovoltaic Specialists Conf. (1973), pp. 52-57.
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