Researchers at Rice University have developed a bottom-up method for growing patterned diamond surfaces to cool electronics.
What started as a fun experiment to create a decorative diamond “owl” for distinguished guests has evolved into a scalable manufacturing process for electronics.Researchers at Rice University have developed a bottom-up method for growing patterned diamond surfaces to cool electronics.
The technique enables diamonds to be integrated directly into devices, reducing operating temperatures by 23°C . It could help extend device lifespans, improve performance, and increase energy efficiency in technologies such as 5G, radar, and AI data centers.“In the world of electronics, heat is the enemy,” said Xiang Zhang, assistant research professor of materials science and nanoengineering at Rice. “A reduction of 23 C is significant — it can extend the lifespan of a device and allow it to run faster without overheating,” Zhang added.Breaking the heat barrierHigh-power technologies, such as AI processors and 5G hardware, are currently hindered by severe heat management challenges. Diamond is the undisputed champion of heat management, but it is difficult to work with. It is one of the hardest substances on Earth, making the “top-down” approach — where you grow a slab and then try to carve it — slow, expensive, and damaging to the material.Hence, the researchers are shifting toward “bottom-up” approaches to grow diamonds in precise, functional forms that can be integrated into electronics.The “bottom-up” process uses microwave plasma chemical vapor deposition.It uses photolithography, which is the same tech used to print tiny patterns on microchips. The researchers create a “stencil” on the chip’s surface. They then dust this stencil with nanodiamond “seeds.” When placed in a high-energy reactor, carbon atoms rain down, latch onto those seeds, and grow into a solid, heat-conducting layer exactly where it’s needed.“It entails a reactor that uses microwave energy — like in your kitchen but much more powerful — to turn gas into plasma,” Zhang said. “This plasma breaks down carbon-heavy gases mixed with hydrogen, and the carbon atoms rain down and settle onto your substrate.”Nucleation is the essential first step in growing a diamond, acting as a “seed” that provides the necessary foothold for carbon atoms to assemble into crystal layers. Scalable optionThe versatility of this technique makes it highly promising for industrial applications. The research team successfully scaled their process for 2-inch wafers by strategically choosing between two seeding techniques: photolithography for high-resolution, intricate designs, and laser-cut films for larger-scale applications.This flexibility proves the method is ready for mass production, offering a practical path forward for building the energy-efficient, high-performance electronics of the future.Moreover, the method is compatible with various base layers, such as silicon and gallium nitride. It provides a scalable foundation for integrating high-performance diamond thermal management across diverse semiconductor technologies.“The main takeaway is that we have found a scalable, effective way to integrate diamond cooling into electronics,” said Pulickel Ajayan, who led the study.“This matters because heat is what limits the battery life of your phone and the speed of your computer. By using diamond to cool these devices more efficiently, we can pave the way for faster, more reliable, and longer-lasting technology,” Ajayan explained, professor of materials science and nanoengineering.The next goal is to perfect the bond between the diamond and the underlying electronics. Successfully creating this seamless connection will unlock the ability to build next-generation transistors much faster and more powerfully.The study was published in Applied Physics Letters.
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