Qualification status of 30% efficient next triple junction (XTJ) GaInP2/GaAs/Ge solar cells to AIAA S-111-2005 standard

Spectrolab presents the qualification status of its latest triple junction space solar cell, neXt Triple Junction (XTJ). The beginning of life efficiency averages 29.9% at maximum power (AM0, 28°C, 135.3 mW/cm2). The qualification in progress complies with the AIAA S-111-2005 standards for bare cell, CIC, and coupon level tests. Thermal cycle GEO coupons built for engineering confidence prior to the qualification showed excellent mechanical and electrical performance. Interim qualification status and test results are discussed.