Four-Junction Solar Cell and Fabrication Method
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Nov 21, 2016
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Jun 24, 2014
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A method of fabricating a four-junction solar cell includes: forming a first epitaxial structure comprising first and second subcells and a cover layer over a first substrate through a forward epitaxial growth, and forming a second epitaxial structure comprising third and fourth subcells over the second substrate; forming a groove and a metal bonding layer; forming a groove on the cover layer surface of the first epitaxial structure and the substrate back surface of the second epitaxial structure, and depositing a metal bonding layer in the groove; and bonding the first epitaxial structure and the second epitaxial structure; bonding the cover layer surface of the first epitaxial structure and the substrate back surface of the second epitaxial structure, ensuring that the metal bonding layers are aligned to each other to realize dual bonding between the metal bonding layers and between the semiconductors through high temperature and high pressure treatment.
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