Curvilinear Wiring Reduces Electric Field Density in ICs
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Solution Overview
Problem
Conventional wiring structures in integrated circuits, such as rectangular comb-like structures, create areas of high electric field density that can lead to capacitor breakdown, shorting, and current leakage through the dielectric, particularly due to corners and protrusions in these structures.
Innovation Solution
The implementation of curvilinear wiring structures, including concentric conductive annular structures and spiral-shaped structures, which reduce high field density by eliminating corners and edges, and strategically positioning vias to minimize electric field strength, using a damascene process and curvilinear mask shapes to form conductive vias that conform to the geometry of the wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rectangular comb-like wiring structures are used, then manufacturing simplicity is maintained, but areas of high field density are created causing capacitor breakdown, shorting, and leakage
Solution Approach 1:
The patent applies curvature by replacing rectangular wiring structures with curvilinear (rounded) wiring structures. This eliminates sharp corners and edges that concentrate electric fields, thereby reducing high field density areas that cause capacitor breakdown, shorting, and leakage. The curved geometry distributes electric field more evenly throughout the structure, improving reliability without significantly complicating the manufacturing process.
2Object-affected harmful factors
If conventional rectangular wiring structures are used, then ease of manufacture is maintained, but electric field density is concentrated at corners and edges
Solution Approach 1:
The patent implements curvature in wiring structures to eliminate sharp corners and edges where electric field density naturally concentrates. By using rounded geometries, the electric field is distributed more uniformly, reducing harmful field concentration effects. The curvilinear structures can be fabricated using standard semiconductor manufacturing processes, maintaining ease of manufacture while significantly reducing electric field density concentration.
3Reliability
If vias protrude from the sides of rectangular wires, then electrical connection is achieved, but areas of high field density are created
Solution Approach 1:
The patent uses curvilinear wiring structures where vias connect to rounded wire surfaces rather than sharp corners. This curvature eliminates the high field density areas that occur when vias protrude from rectangular wires, as the rounded geometry distributes the electric field more evenly around the via-wire interface. This improves wiring structure reliability while the via placement remains integrated into the standard fabrication process.
Data Source
AI summary
A method for reducing areas of high field density in an integrated circuit is disclosed. In one embodiment, the method includes forming a first curvilinear wiring structure in a first interconnect layer of an integrated circuit. A second curvilinear wiring structure may be formed in a second interconnect layer of the integrated circuit, such that the first and second curvilinear wiring structures are substantially vertically aligned. The first curvilinear wiring structure may then be electrically connected to the second curvilinear wiring structure. A corresponding apparatus and design structure are also described.