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The patent EP3923349 was granted to Solaero on Jul 19, 2023. The application was filed on Jan 17, 2018 under application number EP21187462A. The patent is currently recorded with a legal status of "Granted And Under Opposition".
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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