Rocket Lab Begins Qualification of Highest Performing Space Solar Cell Technology

Rocket Lab USA, Inc., a global leader in launch services, space systems and space solar power products, announced that its next-generation solar cell technology is transitioning into qualification.

The cell is the next product from SolAero’s patented Inverted MetaMorphic (IMM) solar cell technology, dubbed IMM-β, that is expected to exhibit a conversion efficiency of ~33.3% in volume production.

IMM-β is the 4^th generation IMM product created by SolAero Technologies Inc. (SolAero), a space solar power company acquired by Rocket Lab in January 2022.

The IMM-β solar cell is expected to be the highest efficiency space solar cell technology in high-volume production. The cell boasts an average 33.3% Beginning of Life (BOL) efficiency, up from 32% for the IMM-α that is currently in volume production.

The IMM-β is also a radiation-hard cell with a power remaining factor of 87% after exposure to 1-MeV electrons at a fluence of 1E15 e/cm² or equivalent of about 15 years life in GEO. Now undergoing final space qualification testing, the cells are expected to be ready for commercial use later in 2022.

In addition to its best-in-class efficiency, IMM is more than 40% lighter than typical space grade solar cells which helps to make satellites more cost effective.

“We’re excited to bring to market this next significant step in solar cell performance,” said Brad Clevenger, Vice President & General Manager, Space Systems Power Solutions. “In partnership with our colleagues at the Air Force Research Laboratory (AFRL), we’re not only commercializing the world’s highest efficiency and lightest weight space solar cell, we’re doing so at the most competitive cost of any IMM technology to date. IMM-β‘s impact on solar array and launch mass will make it a compelling option for satellite integrators.”

“IMM-β’s superior performance is a mission enabler in many applications in the civil, military and commercial space markets. It is also the next stepping stone to even higher performance future IMM solar cell technologies, solidifying SolAero’s segment leading position for many years to come,” added Navid Fatemi, SolAero’s Vice President of Business Development.