Energy Harvesting Efficiency of III-V Multi-Junction Concentrator Solar Cells under Realistic Spectral Conditions

摘要

A theoretical analysis on the spectral sensitivity of the bandgap design of four practical III-V triple-junction solar cell structures is presented. The underlying solar cell model uses the detailed balance method. Six locations on Earth are investigated for which the monthly average of the measured aerosol optical depth and the precipitable water are used to calculate direct solar spectra with a discretisation of one spectrum per hour. The model is used to analyze the solar cell designs for the highest yearly energy production. Furthermore, the ideal bandgap combination for a maximal energy harvest is calculated for each location. It is shown that the metamorphic solar cell structure of Ga_(0.35)In_(0.65)P/Ga_(0.83)In_(0.17)As/Ge with transparencies optimized for the standard AM 1.5d reference spectrum leads to the highest energy harvesting efficiencies and shows the lowest spectral sensitivity. The standard lattice-matched structure ofIn P/Ga_(0.99)In_(0.01) As/Ge shows the highest spectral sensitivity with up to 10.8% difference in the yearly energy harvesting.