Testing of dual-junction SCARLET modules and cells plus lessons learned

Key simulator test methods and results for Solar Concentrator Array with Refractive Linear Element Technology (SCARLET) cells, modules, and module strings are presented from the NASA/JPL New Millennium DS1 program. Important observations and lessons learned are discussed. These findings include: (1) a significant efficiency increase for shunted low performing 1 sun cells at SCARLET's /spl sim/7 sun concentration; (2) a decrease in temperature coefficient under SCARLET concentration; and (3) the importance of active germanium (third junction) screening during GaInP/sub 2//GaAs/Ge cell production especially when red reflecting covers are used.