HexSeed raises $811K to cool AI data centres with diamond coatings
What's the deal? HexSeed TechnologyDealroom has a profile for this one. Try Dealroom → has raised $811,000 in a seed round to develop diamond coatings that reduce energy waste in the data centres powering AI. Carbon13Dealroom has a profile for this one. Try Dealroom → led the round, with participation from Net Zero Technology CentreDealroom has a profile for this one. Try Dealroom → and Vento VenturesDealroom has a profile for this one. Try Dealroom →.
What's the endgame? The startup, working with University of BristolDealroom has a profile for this one. Try Dealroom → researchers, is developing a way to apply ultra-thin diamond coatings to electronic components in data centre power systems. Diamond is one of the world's most effective heat conductors, so the coatings could help components run cooler, more efficiently, and for longer.
The technical hurdle: existing methods for applying diamond require temperatures that would damage finished semiconductors. HexSeed is developing a low-temperature process that can coat completed gallium nitride (GaN) devices without harming them.
Why now? Data centres already consume a significant share of global electricity, and the International Energy AgencyDealroom has a profile for this one. Try Dealroom → predicts their demand could reach 945 TWh by 2030, driven largely by AI. GaN transistors are more efficient than silicon, but managing the heat they generate remains a major challenge.
The company's first target is power conversion hardware for hyperscale data centres. The funding will demonstrate the coating process on commercial GaN devices and support engagement with pilot customers. It also unlocks an Innovate UKDealroom has a profile for this one. Try Dealroom → Partnership Grant, awarded provisionally earlier this year.
HexSeed was founded by chief executive officer Mark Tandy, chief technology officer Leonardo Santoni, and chief operating officer Michael Glerum. It is working with University of Bristol Professors Paul May, a diamond materials expert, and Martin Kuball, a specialist in semiconductor devices and heat management.
"Data centres are on track to consume a significant share of UK grid capacity within the decade, and a large proportion of that energy is lost as heat in power conversion," said Tandy. The funding will move the technology "from laboratory demonstration to working GaN devices," he added.
The signal: At $811,000, HexSeed's raise sits near the middle of comparable seed rounds — modest, but typical for a research-led hardware startup still proving its process. As AI drives data centre power demand higher, efficiency at the component level is becoming a market of its own.
Read more: University of Bristol
Image credit: Free Public Domain Illustrations by rawpixel
