Monolithic 3D GaN-Si IC Integration for Power and RF Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor technologies, such as Si and III-V technologies, face limitations in power delivery and RF communication, necessitating a more efficient semiconductor technology to achieve better energy efficiency, performance, and smaller form factors.
Innovation Solution
The integration of gallium nitride (GaN) integrated circuits using monolithic 3D integration, which enables the co-integration of GaN NMOS and Si CMOS, allowing for compact, efficient power delivery, and RF solutions with CMOS digital signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Si and III-V technologies are used for power delivery and RF communication, then basic functionality is achieved, but energy efficiency and performance are limited
Solution Approach 1:
The patent employs composite material structures by integrating GaN HEMT devices with silicon-based CMOS circuits on the same substrate. The GaN layer provides superior power and RF performance with higher electron mobility and breakdown voltage, while the silicon substrate offers mature CMOS fabrication compatibility. This composite approach enables both high energy efficiency in power/RF sections and reliable digital signal processing in CMOS sections, resolving the contradiction between energy efficiency and performance reliability.
2Power
If conventional semiconductor technologies are used, then manufacturing simplicity is maintained, but power delivery and RF performance are insufficient
Solution Approach 1:
The patent merges GaN HEMT power/RF devices with silicon CMOS digital signal processing circuits into a single integrated chip structure. The GaN section handles high-power and high-frequency signal amplification, while the CMOS section performs digital signal processing tasks. This merging eliminates the need for separate discrete components and interconnections, achieving high power delivery capability while managing integration complexity through unified fabrication processes.
Solution Approach 2:
The patent utilizes vertical heterostructure design in the GaN HEMT devices, where multiple functional layers (AlGaN barrier layer, GaN channel layer, doping layers) are stacked vertically to achieve high electron density and breakdown voltage. This vertical dimensionality enables enhanced power and RF performance without proportionally increasing planar device footprint, thus managing device complexity while improving power capability.
3Use of energy by moving object
If GaN technology is adopted for better power and RF performance, then energy efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by implementing GaN HEMT structures only in specific regions where high power and RF performance are required, while the remainder of the chip uses standard silicon CMOS fabrication. The GaN section is selectively grown and processed on designated areas of the silicon substrate, allowing high energy efficiency in critical sections without subjecting the entire manufacturing process to GaN complexity. This localized approach maintains ease of manufacture for the majority of the device while achieving superior energy efficiency where needed.
Data Source
AI summary
Gallium nitride (GaN) integrated circuit technology is described. In an example, an integrated circuit structure includes a substrate including silicon, the substrate having a top surface. A first trench is in the substrate, the first trench having a first width. A second trench is in the substrate, the second trench having a second width less than the first width. A first island is in the first trench, the first island including gallium and nitrogen and having first corner facets below the top surface of the substrate. A second island is in the second trench, the second island including gallium and nitrogen and having second corner facets below the top surface of the substrate.