Concentrator module based on LPE-grown GaAs solar cells

The design of a 62.6 cm/sup 2/ concentrator test module and the results of its outdoor measurements are presented. The module is based on p-AlGaAs/p-GaAs/n-GaAs(substrate) solar cells grown by the LPE etchback-regrowth method. A new concentrator grid design with only 3.3% shadowing is applied to these solar cells. The module efficiency of 19.1% has been obtained under 851 W/m/sup 2/ direct normal insolation without active cooling and without secondary lenses. >