Fin Contact Isolation Layout for Flexible Power Rail Routing
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Solution Overview
Problem
Current integrated circuit (IC) designs face limitations in routing flexibility due to the lack of isolation between fin structures and overlying contacts, which restricts the separation between adjacent power rails to less than three signal traces, hindering efficient IC layout configurations.
Innovation Solution
The implementation of an isolation layer between a fin structure and an overlying contact allows for increased routing flexibility by electrically isolating the contact from the fin structure, enabling connections between different fin locations and supporting IC layouts with a separation of three signal traces and four metal spaces between power rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If no isolation layer is formed between fin structure and contact, then manufacturing process is simpler, but routing flexibility is limited and power rail separation is restricted to less than three signal traces
Solution Approach 1:
An isolation layer is introduced as an intermediary component between the fin structure and the contact. This isolation layer acts as a mediator that enables electrical isolation, allowing the contact to be connected to different fin locations (such as source or drain) without being directly electrically coupled to the fin structure. This resolves the contradiction by adding a component that provides the necessary isolation to achieve routing flexibility.
Solution Approach 2:
The contact structure is segmented into distinct electrical regions by introducing the isolation layer. The isolation layer divides the contact into a first portion (electrically connected to the fin structure) and a second portion (electrically isolated from the fin structure). This segmentation allows different portions of the contact to serve different electrical functions, enabling enhanced routing flexibility and support for greater power rail separation.
2Adaptability or versatility
If isolation layer is added between fin structure and contact, then routing flexibility increases and power rail separation can be three signal traces or more, but manufacturing complexity increases
Solution Approach 1:
The isolation layer is formed preliminarily before the contact is fully formed or connected. By pre-establishing the isolation layer between the fin structure and contact, the design enables subsequent routing configurations without requiring complex post-processing steps. This preliminary action simplifies the overall manufacturing sequence despite adding the isolation layer.
Solution Approach 2:
The isolation layer serves multiple functions: it provides electrical isolation between the fin structure and contact, enables routing flexibility for different fin locations (source or drain), and supports increased power rail separation. This multi-functionality justifies the added manufacturing complexity by delivering multiple design benefits from a single structural element.
Data Source
AI summary
An IC structure includes a fin structure, a contact overlying the fin structure along a first direction, and an isolation layer between the contact and the fin structure. The isolation layer is adjacent to a portion of the contact along a second direction perpendicular to the first direction.