Fabrication Method for Multi-junction Solar Cells
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Nov 13, 2014
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Jul 19, 2012
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Abstract
A fabrication method for high-efficiency multi junction solar cells, including: providing a Ge substrate for semiconductor epitaxial growth; growing an emitter region over the Ge substrate (as the base) to form a first subcell with a first band gap; forming a second subcell with a second band gap larger than the first band gap and lattice matched with the first subcell over the first subcell via MBE; forming a third subcell with a third band gap larger than the second band gap and lattice matched with the first and second subcells over the second subcell via MOCVD; and forming a fourth subcell with a fourth band gap larger than the third band gap and lattice matched with the first, second and third subcells over the third subcell via MOCVD.
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