ACTIVE SOLAR CELL AND METHOD OF MANUFACTURE
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United States of America Patent
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Oct 1, 2012
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Apr 4, 2007
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Methods for improving the efficiency of solar cells, and a solar cell thereof. One aspect involves a solar cell with a semiconductor layer (11, 12, 13, 14, 15, 16, 17) with a natural band gap NB (NB2, NB3, NB4, NB5, NB6, NB7). This semiconductor layer also has at least one electrode (100, 101, 110, 111, 120, 121) designed to produce an ambient voltage V (V1, V2, V3, V4, V5, V6, V7) into the layer. The incoming photons therefore experience a modified NB−V=B band gap (B1, B2, B3, B4, B5, B6, B7), referred here to as the apparent band gap. Photons with E>B1 will be absorbed into the band gap B, and the electron in the semiconductor valence band will get excited onto the conduction band thus resulting in photocurrent. The ability to tune the apparent band gap B provides an enormous strength to optimize the incoming photon collection.
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