Theoretical investigation on optimum bandgap energies of Ge-Based III–V Triple-Junction solar cells for long-term energy production on mars

Based on theoretical considerations, optimum triple-junction bandgap combinations are determined to achieve highest electrical energy production for a long-term mission on the Martian surface. The solar cell structures analyzed in this contribution are based on the GaInP/GaInAs/Ge material system. Realistic ambient temperature and atmospheric dust profiles as well as spectral illumination conditions as observed on the Martian surface are considered. The variation of optimum bandgap combinations during the yearly cycle is discussed with respect to the environmental parameters.