Impact of solar simulator spectrum on multi-junction solar cell measurement

Accurate laboratory measurement of the IV parameters of multi-junction (MJ) solar cells is highly dependent on the incident spectrum. This paper examines the influence of simulator spectrum on MJ solar cell measurements through the use of a multi-zone solar simulator capable of varying light output on each MJ subcell independently. It is shown through solar simulator spectrum offset that standard characterization methodology may result in significant error in IV parameter measurement resulting in over or underestimation of cell performance.