Intersecting Semiconductor Lines With Narrowed Trench Regions
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Solution Overview
Problem
In integrated circuit fabrication, forming intersecting lines of material poses a dilemma where either voids are left in intersecting trenches or excess material is deposited, leading to waste, as conventional methods struggle to evenly fill both the trenches and their intersections without causing either issue.
Innovation Solution
Modifying the trench width at the intersection by creating narrowed regions adjacent to the intersection allows for the same amount of material to fill both the intersection and the trenches without overfilling, using a specific geometrical relationship to determine the required thickness, thereby avoiding voids and excess material deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficient material is deposited to completely fill the intersection and prevent void formation, then the reliability of electrical coupling is improved, but the loss of substance increases due to excess material deposition in other trench segments
Solution Approach 1:
The patent applies local quality by creating a narrowed region specifically at the intersection area of the trenches, while leaving the rest of the trench segments at their original width. This localized modification ensures that the intersection receives sufficient material for complete filling and reliable electrical coupling, while the narrower trench segments minimize excess material deposition. The selective width modification directly addresses the contradiction by improving reliability at the critical intersection point without causing widespread material waste.
2Manufacturing precision
If material deposition thickness is increased to fill the intersection completely, then the manufacturing precision of the intersection filling is improved, but the loss of substance increases due to overfilling of non-intersection trench segments
Solution Approach 1:
The narrowed region at the intersection creates a local geometric modification that allows precise control of material deposition. By reducing the trench width specifically at the intersection, the patent enables the deposited material to completely fill this critical area achieving high manufacturing precision, while the reduced cross-sectional area minimizes the volume of material required and prevents overfilling in other segments.
3Loss of substance
If material deposition thickness is reduced to avoid excess material in trench segments, then the loss of substance decreases, but voids are formed in the intersection compromising reliability
Solution Approach 1:
The patent creates a localized narrowed region at the intersection that changes the material volume requirements for this specific area. This local geometric modification allows the use of an optimized material thickness that is sufficient to completely fill the intersection (ensuring reliability) while being minimal enough to avoid significant waste in the trench segments. The narrowed region acts as a material-efficient design feature at the critical location.
Data Source
AI summary
Some embodiments include semiconductor constructions having first and second electrically conductive lines that intersect with one another at an intersection. The first line has primarily a first width, and has narrowed regions directly against the second line and on opposing sides of the second line from one another. Electrically conductive contacts are along the first line and directly electrically coupled to the first line, and one of the electrically conductive contacts is directly against the intersection. Some embodiments include methods of forming intersecting lines of material. First and second trenches are formed, and intersect with one another at an intersection. The first trench has primarily a first width, and has narrowed regions directly against the second trench and on opposing sides of the second trench from one another. Material is deposited within the first and second trenches to substantially entirely fill the first and second trenches.