Subsurface Metal Transistor Structure for CMOS Ground Routing
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Solution Overview
Problem
Integrated circuits require multiple layers of interconnections to access ground potential, leading to complexity and inefficiency in transistor design, particularly for CMOS circuits, which affects speed, power consumption, and noise immunity.
Innovation Solution
The development of merged semiconductor-junction and metal-connection structures within the silicon substrate allows for direct and efficient connection of transistors to power sources and ground, reducing the need for surface-level metal contacts and interconnections, thereby simplifying circuit design and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple layers of interconnections are used to access ground potential, then transistors can be connected to power sources and ground, but the complexity of interconnections increases and efficiency decreases
Solution Approach 1:
The patent moves interconnections from the traditional planar surface dimension into the vertical dimension by creating conductive regions within the silicon substrate itself. This allows power and ground connections to be established through the bulk material rather than requiring multiple stacked metal layers, effectively reducing interconnection complexity while maintaining electrical connectivity.
Solution Approach 2:
The conductive regions are nested within the silicon substrate, embedding the interconnection functionality inside the bulk material. This nesting approach allows the substrate to simultaneously serve as both the active device region and the interconnection medium, eliminating the need for separate surface-level interconnection layers.
2Area of stationary object
If surface-level metal contacts are used to connect transistors to ground, then electrical connection is achieved, but the area occupied by the transistor increases
Solution Approach 1:
The patent transitions from two-dimensional surface contacts to three-dimensional subsurface conductive regions. By establishing electrical connections within the bulk substrate rather than on the surface, the footprint of the transistor is reduced while maintaining robust electrical connectivity to power and ground.
Solution Approach 2:
The silicon substrate itself serves dual functions: as the active device region and as the interconnection medium. The substrate provides its own conductive pathways for power and ground connections, eliminating the need for external surface-level metal contacts and reducing the overall device area.
3Object-affected harmful factors
If multiple layers of interconnections are positioned above the silicon substrate, then transistors can access power and ground potentials, but noise immunity decreases and thermal dissipation is less effective
Solution Approach 1:
By nesting the conductive regions within the silicon substrate, the patent provides inherent shielding from external electromagnetic noise. The bulk substrate acts as a shield, protecting the sensitive active regions from noise while simultaneously providing efficient thermal pathways to dissipate heat generated during operation.
Solution Approach 2:
The silicon substrate serves as an intermediary medium that simultaneously provides electrical connectivity, noise shielding, and thermal management. This single substrate material mediates multiple functions that would otherwise require separate components, improving noise immunity while enhancing thermal dissipation capabilities.
Data Source
AI summary
A transistor structure includes a semiconductor substrate, agate structure, a channel region, and a first conductive region. The semiconductor substrate has a semiconductor surface. The channel region includes a first terminal and a second terminal. The first conductive region is electrically coupled to the first terminal of the channel region, and the first conductive region includes a first metal containing region under the semiconductor surface.