p-n GaInP2/GaAs tandem solar cells

This paper reports the study on p-n GaInP2/GaAs tandem cells. The cell samples were produced by metal-organic chemical vapor deposition at a low gas pressure. In order to optimize the device configuration, numerical modeling has been performed for the impacts of a field-aided collection on the performances of the top cells. On the basis of modeling results, a modified configuration of top cells is introduced, using p(+)-p(-)-n(-)-n(+) structure instead of p(+)-n structure. This modification has brought about much improved photovoltaic performance of the top and tandem cells, with the conversion efficiency Eff = 14.26% and 23.82% (AMO, 25degreesC, 2 x 2cm(2)), respectively.