RADIATION RESISTANT INVERTED METAMORPHIC MULTIJUNCTION SOLAR CELL
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United States of America Patent
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Jul 15, 2013
filing date -
Jun 7, 2012
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Abstract
A multijunction solar cell for a space radiation environment, the multijunction solar cell having a plurality of solar sub-cells arranged in order of decreasing band gap including: a first solar subcell composed of InGaP and having a first band gap, the first solar subcell having a first short circuit current associated therewith; a second solar subcell composed of GaAs and having a second band gap which is less than the first band gap, the second solar subcell having a second short circuit current associated therewith; wherein in a beginning of life state the first short circuit current is less than the second short circuit current such that the AM0 conversion efficiency is sub-optimal. However, in an end of life state, the short circuit current are substantially matched, which results in an improved AM0 conversion efficiency.
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