Pitch Mismatch Coupling via Vertical Interconnects
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Solution Overview
Problem
Coupling structures formed along a relatively loose pitch with those along a relatively tight pitch in integrated circuitry is challenging due to the difficulty in achieving effective connections without short circuits, especially as the disparity in pitch increases.
Innovation Solution
The implementation of a method where conductive structures are formed along a second pitch that is at least twice as large as the first pitch, with specific conductive lines being recessed to avoid direct contact and short circuits, allowing for unique coupling between features on different pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conductive structures are formed along a tight pitch to achieve high packing density, then area utilization is improved, but the difficulty of coupling with loosely-pitched structures increases
Solution Approach 1:
The patent transitions from a two-dimensional planar coupling approach to a three-dimensional vertical coupling approach. Conductive structures are formed extending vertically from the tightly-pitched first layer through intermediate layers to reach the loosely-pitched second layer, enabling coupling in the vertical dimension rather than attempting horizontal coupling across the pitch disparity.
Solution Approach 2:
The patent introduces intermediate conductive structures and insulative layers that act as mediators between the tightly-pitched first conductive structures and the loosely-pitched second conductive structures. These intermediate elements facilitate the coupling by bridging the pitch mismatch while maintaining proper electrical connections and isolation.
2Device complexity
If conductive structures are directly coupled across different pitches, then connection simplicity is improved, but short circuit risk increases
Solution Approach 1:
The patent applies different properties to different regions of the conductive structures. Insulative layers are selectively positioned at specific locations where pitch transitions occur, providing localized electrical isolation precisely where short circuit risk exists, while allowing conductive regions to maintain connectivity where needed.
Solution Approach 2:
Insulative layers are introduced as intermediary elements between conductive structures at different pitches. These intermediaries prevent direct unwanted contact between conductive structures while allowing the overall coupling function to be achieved through controlled vertical extensions.
Data Source
AI summary
Some embodiments include a method of forming an integrated assembly. Conductive lines are formed to extend along a first direction, and are spaced from one another by a first pitch. Protective knobs are formed over the conductive lines and are arranged in rows. The protective knobs within each row are spaced along a second pitch which is greater than the first pitch. The protective knobs protect regions of the conductive lines while leaving other regions of the conductive lines unprotected. The unprotected regions are recessed so that the protected regions become tall regions and the unprotected regions become short regions. The protective knobs are removed. Conductive structures are formed over the conductive lines. The conductive structures are spaced along the second pitch. Each of the conductive lines is uniquely coupled to only one of the conductive structures. Some embodiments include integrated assemblies.