Silicon-based solar energy conversion cells

Details Silicon-based solar energy conversion cells Silicon-based solar energy conversion cells

H - Electricity

01

L

345/23, 117/73,

H01L 31/18 (2006.01) H01L 31/028 (2006.01)

Patent

CA 1240284

ABSTRACT OF THE DISCLOSURE Silicon-based solar cells devised hitherto have used crystalline silicon because of its acceptable electrical characteristics. Amorphous silicon is much cheaper and has better optical absorption characteristics, but its electrical characteristics are so poor that it cannot be used, without some additional treatment such as hydrogenation. The invention provides a method of production of solar cells using amorphous silicon in which the silicon is evaporated in a suitable vacuum onto a substrate in the presence of a positive field which opposes the migration of the positive silicon ions toward the substrate. The resulting devices are found to have much improved electrical characteristic while retaining a good absorption characteristic. A tentative hypothesis is given for the unexpected improvement.

473833

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