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High efficiency and radiation resistant InGaP/GaAs//CIGS stacked solar cells for space applications

Mechanical stacking solar technology has great potential to achieve high-efficiency multijunction solar cells. A new mechanical stacking solar cell method using conductive nanoparticle alignments enables InGaP/GaAs//CIGS solar cell fabrication. This structure is expected to be suitable for space solar cells, because of its potential high radiation resistance. We fabricated a prototype of such solar cell and performed radiation tests to investigate their applicability in space. The results showed that the solar cells have higher radiation resistance than that of typical InGaP/GaAs/InGaAs IMM3J space solar cells.