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A novel approach has been developed to enable the creation of a fully lattice-matched two-terminal four-junction III–V solar cell is which an upper 1.85 eV GaInP/ 1.42 eV GaAs two-junction (2J) tandem cell is bonded to a lower Eg3 eV GaInAsP/ 0.74 GaInAs eV 2J tandem cell. In this configuration, the upper tandem is grown inverted and lattice-matched to a GaAs substrate, and the lower tandem is grown...
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