Intel researchers have developed an integrated CMOS Driver-GaN (DrGaN) power switch, combining gallium nitride (GaN) and silicon CMOS technologies on a 300mm GaN-on-Si platform. This innovation is designed to meet the increasing power density and efficiency needs of data centers and networking platforms. The new device, termed DrGaN, features an e-mode HEMT and an integrated 3D monolithic Si PMOS. It's capable of addressing the power requirements of future CPUs and GPUs, showing excellent resistance and leakage performance. A key advancement is the development of a new gate-last process flow for 3D monolithic integration of GaN and Si CMOS through layer transfer.
Intel researchers have developed an integrated CMOS Driver-GaN (DrGaN) power switch, combining gallium nitride (GaN) and silicon CMOS technologies on a 300mm GaN-on-Si platform.
This process involves completing the high-temperature activation steps for the Si CMOS transistors before depositing the GaN transistor's gate dielectric, solving a major challenge in integrating these two technologies. This method also allows GaN and Si CMOS transistors to share the same backend interconnect stack, which reduces resistance and mask count. The new technology demonstrates great promise for scaling, evidenced by a figure of merit of 0.59 (mΩ-nC)-1 for a 30nm gate-length GaN MOSHEMT. The paper includes images of the new process flow, the 3D monolithic integration, and the layout of a DrGaN unit cell, illustrating the advanced integration and circuitry of this novel power device.
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