Correlation between the open circuit voltage and the electroluminescence spectrum of solar cells with quantum objects

GaAs solar cells with different number of rows of GaInAs quantum objects have been studied. It has been shown that recombination through quantum objects linearly increases with respect to recombination through the bulk GaAs with the number of rows increases. The ratio of the saturation currents of p-n junctions with and without quantum objects, which determines the open circuit voltage drop (ΔVoc) has been investigated. A direct relationship between the increase of ΔVoc and the increase in the relative electroluminescence intensity in quantum objects has been established.