Multilayer Antireflection Coating for Triple Junction Solar Cells

According to the theory of optical films, we simulate the reflectivity of antireflection coatings (ARCs) for solar cells of Ga_0.5In_0.5P/GaAs/Ge based on an optical transfer matrix. In order to provide sufficient consideration of the refractive index dispersion effect of multilayer ARCs, we use multi−dimensional matrix data for reliable simulation. After the reflection curves are obtained, the effective average reflectance R_e is introduced to optimize the film system by minimizing R_e. Optimization of single layer (Al₂O₃), double layer (MgF₂/ZnS) and triple layer (MgF₂/Al₂O₃/ZnS) ARCs is realized by using this method for space and terrestrial applications. Effects of these ARCs are compared after optimization. These theoretical parameters can be used to guide experiments.