Patent No. EP3923349 (titled "Four Junction Solar Cell And Solar Cell Assemblies For Space Applications") was filed by Solaero on Jan 17, 2018. The application was issued on Jul 19, 2023.
A four-junction solar cell for space applications with improved end-of-life performance, comprising an upper first subcell with a bandgap of 2.0-2.15 eV, a second subcell with a bandgap of 1.55-1.8 eV, a third subcell with a bandgap of 1.41 eV or less, and a fourth subcell with a bandgap of 0.67 eV, where the fourth subcell is lattice mismatched from the third subcell. The average bandgap of the four subcells is greater than 1.35 eV, and the cell is designed to maintain high efficiency at temperatures up to 70°C after 5 years of operation in space.

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