Matching of multi junction solar cells for solar array production

The current matching of multi junction solar cells determines the most important cell characteristics, such as efficiency and degradation hardness. The evaluation of current-voltage curves under different spectral irradiances enables a quantitative assessment of the device. Especially the variation of one cell's fill factor clearly indicates the shift in the current matching. A minimal fill factor can be observed at highest power or only a decreasing fill factor during the shift from red- to blue-rich spectra, which confirms the theory of series connected devices. This information shows the optimisation potential of the cell as a feedback for the manufacturer as well as the correct classification for matching to receive a high power string, module and panel. The end of life efficiency can be maximised by careful selection of the appropriate multi junction solar cell for an individual mission.