Semiconductor Wiring Branch Layout With Dummy Lines for Void Control
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Solution Overview
Problem
In semiconductor devices, stress-induced vacancies in metallic materials like copper can concentrate at branch points, leading to increased wiring resistance and the risk of line breakage due to the formation of large voids, which adversely affect the electrical characteristics of transistors.
Innovation Solution
The semiconductor device incorporates dummy metallic lines adjacent to the main source and drain lines, which are not electrically connected to other lines, to disperse stress and vacancies, thereby reducing the concentration of vacancies at critical branch points and minimizing the formation of large voids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic lines are used for current conduction, then electrical conductivity is achieved, but vacancies concentrate at branch points causing increased resistance and potential line breakage
Solution Approach 1:
A dummy metallic line is introduced as an intermediary structure between the first and second metallic lines. This dummy line serves as a stress relief valve that absorbs excess vacancies and stress that would otherwise concentrate at the branch point between the first metallic line and the second metallic line, thereby preventing vacancy accumulation and line breakage while maintaining electrical conductivity of the functional lines.
Solution Approach 2:
The dummy metallic line is created as a copy of the functional metallic line structure, with similar material composition and geometric characteristics. By replicating the structural properties of the functional lines, the dummy line effectively mimics the stress and vacancy behavior, allowing it to serve as a sacrificial structure that protects the functional lines from vacancy-induced failures.
2Adaptability or versatility
If branch points are created in metallic lines, then circuit functionality is achieved, but vacancy concentration at branch points increases resistance and causes line breakage
Solution Approach 1:
The dummy metallic line acts as a mediator that intercepts and redirects stress and vacancies away from the critical branch point. By providing an alternative path for stress relaxation, the dummy line protects the functional branch connection from vacancy-induced failures while preserving the necessary circuit topology and connectivity.
3Adaptability or versatility
If metallic lines extend in multiple directions, then device functionality is achieved, but stress concentration leads to vacancy growth and line breaking
Solution Approach 1:
The dummy metallic line converts the harmful effect of stress concentration into a beneficial protective mechanism. By intentionally introducing a non-functional line that attracts and absorbs stress and vacancies, the design transforms the potential failure mechanism into a protective feature that strengthens the overall wiring structure and prevents line breakage in the functional connections.
Data Source
AI summary
A semiconductor device according to the present embodiment comprises a first metallic line. The first metallic line is provided above a substrate and extends in a first direction with a first width. At least one second metallic line is connected to the first metallic line and extends in a second direction from the first metallic line with a second width that is smaller than the first width. A dummy metallic line is arranged adjacently to the at least one second metallic line, connected to the first metallic line, and extends in the second direction from the first metallic line. The dummy metallic line is not electrically connected to lines other than the first metallic line.