This new system, which connects gallium nitride (GaN) transistors to silicon chips, will enable devices that generate less heat and provide much higher signal power. This developed method could eliminate a critical barrier for high-speed electronic devices. Researchers at the Massachusetts Institute of Technology (MIT), Georgia Tech, and the US Air Force Research Laboratory have successfully placed GaN transistors directly onto traditional silicon chips. This development reduces heat generation and increases signal power, paving the way for next-generation devices.
Gallium nitride is a semiconductor known for its superior performance, especially in high-frequency data transmission and energy efficiency. Until now, this material, used in many areas from mobile base stations to data centers, could not be widely adopted due to its high costs and manufacturing difficulties. The new method developed under MIT’s leadership provides a practical and economical solution to this situation. Researchers have managed to reduce both material waste and costs by placing GaN transistors only where needed on silicon chips.
The new method essentially works by individually placing GaN transistors, each a few hundred microns in size, onto the silicon chip. During this process, microscopic copper columns found in both the GaN transistors and the silicon chip are used. These columns are aligned with each other and joined together through a bonding process that occurs below 400°C. This low temperature also prevents damage to sensitive semiconductor structures. Unlike the previously used expensive and high-temperature gold, the preferred copper here is both cheaper and much more advantageous in terms of electrical conductivity. The MIT team also developed a special placement tool that operates with a vacuum suction system to perform this delicate process.
More Powerful, Cooler
Initial tests with the hybrid chips produced using this new manufacturing technique showed wider bandwidth and higher signal power compared to traditional silicon chips. Additionally, its compact design allows for better heat dissipation, directly solving the common overheating problem in high-performance electronics.
Researchers believe this technology will not be limited to just mobile communication and data centers. GaN’s superior performance at low temperatures could also play a significant role in future quantum computing systems.
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