Left: Illustration showing front contact grid, AR coating, top cell, middle cell, tunnel junction, bottom cell, and back contact. From top to bottom layers are N+-GaAs, n-AlInP, n-InGaP, p-InGaP, p-AlGaInP, p++-GaAs, n++-GaAs, n-InGaP, n-InGaAs, p-InGaP, p++-GaAs, n++-GaAs, n-GaAs, n-Ge, p-Ge. Right: Graph of energy gap in electron volts versus lattice constant in angstroms and wavelength in micrometers.
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