Solar cells and method of making solar cells
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United States of America Patent
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Sep 16, 2014
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app pub date -
May 11, 2009
filing date -
May 12, 2008
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Abstract
A multi-junction photovoltaic cell includes at least two P-N junctions electrically connected to each other in series. Each P-N junction includes a P-type absorber layer and a N-type emitter layer, each P-type absorber layer including a plurality of alternating thin film layers of zinc telluride and lead telluride, wherein zinc telluride and lead telluride have respective bandgaps when in bulk thickness and the effective bandgap of each P-type absorber layer is between the respective bandgaps. The effective bandgap of at least one P-type absorber layer is different from that of at least one other P-type absorber layer.
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