Research on constitutive parameters of high-efficiency inverted metamorphic GaAs triple junction solar cell for space applications

Another option for the next generation of solar cells for space applications is the inverted metamorphic (IMM) GaAs triple junction solar cell, which has a greater photoelectric conversion efficiency since it significantly addresses the current issue of subcell mismatch. IMM solar cells have the mechanical properties of ductile materials, which are different from the brittle materials properties of conventional GaAs triple junction solar cells; therefore, the accuracy of the constitutive model of IMM solar cells is a key factor in simulating its resistance to the mechanical environment. In this paper, the Voce constitutive model is used to simulate the tensile experimental process of IMM solar cells. On the basis of the ANSYS-OptiSlang co-simulation platform, the NLPQL optimization algorithm is used, and the tensile experimental validation is combined to form the objective function with the difference between the numerical simulation and experimental data. Then, the objective function is minimized to acquire the parameters of the constitutive model. The results indicate that the stress-strain curves calculated by the inverse optimization method are very similar to the experimental results. The ensuing mechanical simulation analysis can make use of the IMM solar cell constitutive model that was created using this technique.