Solar cells for space applications are typically designed to provide highest performance values at End of Life (EOL) conditions, meaning after a typical to be expected degradation due to particle irradiation and under a constant sun spectrum without perturbation by any atmosphere. Typically, these solar cells are used without modification also for Martian missions. However, due to the fact that the spectral conditions on Mars are significantly different from typical space missions, those solar cells are not at all optimised for providing highest performances.