HexSeed Raises Seed Funding for AI Chip Thermal Management

Edinburgh-based HexSeed Technology has successfully closed an early-stage funding round, securing over £600,000 to advance its innovative thermal management solutions for AI semiconductors. The investment, aimed at scaling its proprietary low-temperature diamond coating technology, was spearheaded by climate-tech venture builder Carbon13. Additional support came from the Net Zero Technology Centre and Italian venture capital firm Vento, underscoring a broad investor confidence in HexSeed's potential to address critical challenges in the rapidly expanding AI infrastructure sector.

Founded in late 2025 by a trio of experts including Chief Executive Mark Tandy, CTO Dr. Leonardo Santoni, and COO Dr. Michael Glerum, HexSeed is focused on developing advanced materials to combat the escalating heat generated by high-performance computing. The company's core innovation lies in its ability to transform captured carbon dioxide into industrial-grade synthetic diamond films, operating under a carbon capture and utilization model. This unique approach not only offers a sustainable manufacturing pathway but also yields a material with exceptional thermal conductivity.

The technology is particularly relevant for the next generation of power semiconductors, such as Gallium Nitride (GaN) transistors, which promise greater efficiency over traditional silicon. HexSeed's low-temperature microwave plasma technique, developed in collaboration with researchers at the University of Bristol, enables the direct application of these diamond coatings onto fabricated GaN chips. This process is designed to significantly enhance heat dissipation away from critical device areas.

The implications for data centers, which are increasingly straining global energy resources, are substantial. As AI workloads intensify, the thermal management of power conversion hardware becomes paramount. HexSeed's solution promises to extend the operational lifespan of these vital components, boost overall thermal efficiency, and crucially, reduce the substantial energy consumption currently lost as heat in hyperscale facilities. This aligns directly with the growing demand for more sustainable and efficient data center operations, a market segment projected to consume a significant portion of national grid capacity in the coming decade.

With this new capital infusion, HexSeed plans to move beyond laboratory demonstrations. The immediate priorities include validating the diamond coating process on commercial GaN devices and initiating pilot trials with key customers. The primary target market for these initial deployments is data center power conversion hardware, where the need for improved thermal performance is most acute. This strategic focus aims to prove the technology's real-world efficacy and commercial viability.

“The energy lost as heat in power conversion within data centers represents a significant inefficiency, and our technology offers a direct solution,” stated Mark Tandy. “This funding is instrumental in enabling us to transition our low-temperature diamond coating from a proven concept to functional GaN devices ready for commercial application.” The successful validation and pilot programs are expected to pave the way for broader adoption across the semiconductor industry, addressing a critical bottleneck in the advancement of AI and high-performance computing.