Hybrid Semiconductor Substrate Layout for SOI-Bulk Integration
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Solution Overview
Problem
The increasing complexity in manufacturing semiconductor devices with high device density leads to issues such as degraded electrical performance and high yield loss, particularly when integrating radio frequency devices with digital or analog devices on different substrates like silicon-on-insulator (SOI) and bulk silicon.
Innovation Solution
A hybrid substrate approach is introduced, which combines bulk silicon regions and SOI regions on a single substrate, allowing for the formation of radio frequency devices on SOI regions and digital/analog devices on bulk silicon regions, thereby reducing the cost and performance loss associated with extra packaging and routing wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio frequency devices and digital/analog devices are integrated on different substrates (SOI and bulk silicon), then device functionality and performance are improved, but manufacturing complexity increases and yield loss increases
Solution Approach 1:
The patent combines SOI and bulk silicon substrates into a single hybrid substrate structure, allowing radio frequency devices and digital/analog devices to be integrated on the same physical substrate. This merging eliminates the need for separate substrate processing and reduces manufacturing complexity while maintaining the performance benefits of heterogeneous integration.
Solution Approach 2:
The substrate is divided into distinct regions with different material properties - SOI regions for radio frequency devices and bulk silicon regions for digital/analog devices. This segmentation allows each device type to operate on its optimal substrate material while being manufactured together in a single process flow.
2Adaptability or versatility
If radio frequency devices and digital/analog devices are integrated on different substrates, then device functionality is improved, but yield loss increases
Solution Approach 1:
By combining both device types on a single hybrid substrate, the patent enables simultaneous processing and testing of all devices in one batch. This eliminates the need for separate manufacturing runs and reduces yield loss associated with multiple processing cycles and alignment operations.
3Ease of manufacture
If hybrid substrate integration is implemented, then manufacturing cost is reduced, but substrate structure complexity increases
Solution Approach 1:
The hybrid substrate implements local quality by providing different material properties in different regions - SOI structures in specific areas for radio frequency devices and bulk silicon in other areas for digital/analog devices. This localized differentiation enables cost-effective manufacturing by using standard processes for each region type while maintaining overall substrate integration.
Data Source
AI summary
A method includes: receiving a composite substrate including a first region and a second region, the composite substrate including a semiconductor substrate and an insulator layer over the semiconductor substrate; forming a trench through the insulator layer, the trench exposing a surface of the semiconductor substrate in the first region; growing an initial epitaxial layer in the trench and over an upper surface of the second region; thickening the initial epitaxial layer to form an epitaxial layer; forming a transistor layer over the epitaxial layer, the transistor layer including a first transistor and a second transistor in the first region and the second region, respectively; and forming an interconnect layer over the transistor layer and electrically coupling the first transistor to the second transistor.