TANDEM PHOTOVOLTAIC DEVICE WITH DUAL FUNCTION SEMICONDUCTOR LAYER
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United States of America Patent
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Issued Date -
Sep 15, 2011
app pub date -
Mar 10, 2010
filing date -
Mar 10, 2010
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Abstract
A tandem photovoltaic device includes at least two photovoltaic cells stacked in an optical and electrical series relationship. At least one of the tandem cells includes a dual function semiconductor layer fabricated from a dual function semiconductor material. This dual function layer is an electronically active constituent of the cell. The dual function layer also is optically active and creates a reflective condition which redirects a portion of the light which has passed through the cell back through the cell's active layers to photo generate additional photocurrent. Use of the dual function material eliminates the need for incorporating separate semiconductor and reflective layers in a photovoltaic device. Further disclosed are exemplary formulations of some dual function materials.
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