Rocket Lab releases IMM Apex solar cell with 31.5% efficiency for space applications

Rocket Lab released IMM Apex, a next-generation inverted metamorphic solar cell for space, targeting higher efficiency and lower mass.

• Beginning-of-life conversion efficiency is set at 31.5%; cell mass has been reduced 40%, lifting specific power while retaining radiation hardness and temperature performance.
• The design removes germanium substrates, cutting exposure to critical-mineral supply constraints and rising input costs in the space-power supply chain.
• It is a mechanical and electrical drop-in replacement for heritage germanium-based cells, aiming to reduce customer retooling costs and integration risk.
• Manufacturing process changes support multi-100-kilowatt production volumes, positioning the product for faster delivery into growing satellite demand.