Dual-junction solar cells with multiple-quantum-well top cells

Multiple-quantum-wells (MQW) in multijunction solar cells allow the absorption edges of the subcells to be tuned individually to maximize the energy yields. In this paper, we present the properties a quantum well material for InGaP quantum well solar cells and the performances of the dual-junction dual-MQW devices. We demonstrate that this dual-junction device can achieve 28% efficiency at 100 suns, which can be further improved by reducing the series resistance in the device.