Abstract:The solar cells with highest efficiencies are the tandem cells with three or four pn junctions in series, connected by tunnel diodes. The current produced by the stacked pn junctions is limited by the smallest one. Therefore, to optimize the full solar cell efficiency it is crucial to match the current produced by the different junctions. This issue has been extensively investigated over the years. In the most usual case of three pn junctions, the current is limited by the middle junction. Recently, the use of… Show more
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