High-low refractive index stacks for broadband antireflection coatings for multijunction solar cells

Abstract Antireflection coatings are an interesting challenge for multijunction solar cells due to their broadband spectrum absorption and the requirement of current matching each subcell. A new design cell antireflection is presented in this work which alternative high low index materials used minimize reflection a (300–1800 nm). We compared short circuit density high-low refractive stacks designs with optimum double-layer by considering two optical combinations (MgF2/ZnS Al2O3/TiO2) AM0 AM1.5D spectra. The calculations demonstrate that lattice-matched triple-junction inverted metamorphic quadruple-junction cells, outperform coatings. philosophy requires no because only exhibits excellent performance angle these slightly better than classical double-layers whereas analysis thickness sensitivity shows small deviations from deposition targets impact Finally, some technical solutions depositing multilayers discussed.