SiC Crystalline Regions on Si Substrates for GaN Integration
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Solution Overview
Problem
The integration of GaN-based devices with Si-based devices is hindered by the high cost, small substrate size, and incompatibility with CMOS processing of SiC substrates, which are typically used for GaN-based devices, limiting design flexibility and scalability.
Innovation Solution
Forming SiC crystalline regions on a Si substrate through carbon ion implantation and subsequent annealing, allowing GaN-based devices to be integrated with Si-based devices on a larger, CMOS-compatible Si substrate, thereby overcoming the limitations of SiC substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GaN-based devices are formed on SiC substrates, then device performance and reliability are improved, but substrate cost increases and substrate size is limited
Solution Approach 1:
The substrate is segmented into two distinct regions: a SiC crystalline region for hosting GaN-based devices and a Si region for CMOS processing. This segmentation allows each region to fulfill its specific function while overcoming the size limitations of pure SiC substrates by utilizing the larger Si substrate platform.
Solution Approach 2:
A buffer layer is introduced as an intermediary between the SiC crystalline region and the Si substrate. This buffer layer mediates the interface between the two different crystal structures, enabling the formation of high-quality SiC crystalline on Si substrate while maintaining device performance.
2Reliability
If GaN-based devices are formed on SiC substrates, then device performance is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive pure SiC substrates with a more cost-effective approach: forming SiC crystalline regions on inexpensive Si substrates. The Si substrate serves as a disposable platform that enables CMOS-compatible processing, significantly reducing manufacturing costs while maintaining the performance benefits of SiC for GaN device regions.
Solution Approach 2:
The substrate material parameter is changed from pure SiC to a hybrid Si substrate with SiC crystalline regions. This parameter change enables the use of standard Si substrate manufacturing processes and CMOS-compatible fabrication, thereby reducing overall manufacturing cost while preserving the essential SiC properties needed for high-performance GaN devices.
3Reliability
If GaN-based devices are formed on SiC substrates, then device performance is improved, but compatibility with CMOS processing is lost
Solution Approach 1:
The substrate exhibits local quality differentiation: the SiC crystalline region provides the high-performance characteristics needed for GaN devices, while the Si region provides CMOS compatibility. This local differentiation allows simultaneous optimization for both GaN device performance and CMOS processing integration on the same substrate.
Solution Approach 2:
The hybrid Si substrate with SiC crystalline region serves multiple functions: it provides a platform for high-performance GaN devices in the SiC region while simultaneously enabling CMOS processing in the Si region. This multi-functionality allows integration of both GaN-based devices and Si-based CMOS circuits on a single substrate, achieving both performance and versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easier integration and enhanced scalability of GaN-based devices with Si-based devices on a single chip, addressing the issues of cost, substrate size, and compatibility, while maintaining superior thermal and electrical properties of SiC substrates.
Implementation Method 1
forming SiC crystalline regions on a Si substrate through carbon ion implantation
Implementation Method 2
subsequent annealing
Data Source
AI summary
A silicon substrate with a GaN-based device and a Si-based device on the silicon substrate is provided. The silicon substrate includes the GaN-based device on a SiC crystalline region. The SiC crystalline region is formed in the silicon substrate. The silicon substrate also includes the Si-based device on a silicon region, and the silicon region is next to the SiC crystalline region on the silicon substrate.