AM0 calibration of 34% efficient mechanically stacked GaInP/GaAsGaSb circuits

During a recent NASA Phase 2 SBIR contract JX Crystals fabricated a batch of triple-junction voltage-matched line-focus concentrator cell circuits, which measured up to 3.4 watts of output power, over 30% AM0 efficiency, during initial flash testing. These circuits have 4 GaInP/GaAs dual junction cells on transparent GaAs assembled on top of 8 diffused junction GaSb booster cells. A novel front cell contact enables all top side bonding. Three of these circuits were flown on the NASA Lear Jet for confirming calibration in October 2001. The flight samples were then used to calibrate JXC´s in-house flash tester and corrected results are reported herein.