Spectrolab (Boeing)

Recognized under Tier 5 — Energy Production & Storage, Spectrolab is Boeing's solar cell subsidiary and a leading supplier of high-efficiency multijunction solar cells for spacecraft power systems, with its NeXt Triple Junction (XTJ) and XTJ Prime cells rated above 30 percent efficiency. Spectrolab cells have flown on hardware landed on the Moon in 1969, on Mars rovers since 2004, and on the Juno spacecraft that reached Jupiter in 2016. More recently, Spectrolab supplied 3,360 XTJ cells across the six-panel solar array of NASA's SWOT ocean-topography satellite and roughly 4,000 XTJ Prime cells for the array powering the Roman Space Telescope. Reliable, high-efficiency photovoltaics remain the default power source for most Moon and Mars missions, and Spectrolab's decades of flight-proven cell heritage underpin the solar arrays that must keep functioning through lunar dust exposure and the dimmer sunlight found at Mars.