AMORPHOUS SILICON PHOTOVOLTAIC CELLS HAVING IMPROVED LIGHT TRAPPING AND ELECTRICITY-GENERATING METHOD
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United States of America Patent
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app pub date -
Oct 19, 2007
filing date -
Apr 26, 2007
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Abandoned
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Abstract
An amorphous silicon photovoltaic cell exhibiting improved light trapping, and a method for generating electricity from sunlight therewith. The cell comprises a plurality of layers, including a transparent superstrate; a specular, first transparent conductor positioned below the transparent superstrate; at least one p-i-n structure having an active layer positioned below the first transparent conductor; a second transparent conductor positioned below the p-i-n structure; and a layer of transparent material positioned below the second transparent conductor. The layer of transparent material may be textured amorphous silicon having a relatively high dielectric constant. The cell may further include a back coating positioned below the layer of transparent material, and a back reflector positioned below the back coating layer.
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