GaInP/GaAs tandem concentrator cells

We discuss the initial development of a concentrator device based on the GaInP/GaAs monolithic tandem cell structure. The very high one‐sun efficiency of this device, coupled with its characteristic low operating current, make this a promising candidate for use under high concentration. Test results for a prototype device are presented. This device achieves an efficiency of 29.5% at a concentration of 102 suns.