Lateral Vias for Buried Microconductor Access in 3D Stacks
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Solution Overview
Problem
In 3D integration, accessing and connecting to buried conductors such as through silicon vias (TSVs) and solder bumps within stacked dies is challenging due to obstruction by other dies and the fragility of thin dies, often requiring destructive methods that result in device functionality loss.
Innovation Solution
The use of lateral vias that extend orthogonally or obliquely to provide electrical connections to buried conductors, formed by creating microholes and filling them with conductive materials, allowing for semi-destructive access to inaccessible conductors within the die stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical connections (TSVs) are used to access buried conductors, then electrical connection is achieved, but the die is obstructed by other stacked die and the thin die becomes difficult to handle
Solution Approach 1:
The patent transitions from vertical connection approach (TSVs extending through the die thickness) to lateral connection approach (connections extending horizontally within the die plane). This dimensional change allows access to buried conductors from the side rather than through the top/bottom surfaces, avoiding obstruction from stacked die and eliminating the need to handle thin dies vertically.
2Ease of operation
If destructive methods are used to access buried conductors, then access is achieved, but device functionality is lost
Solution Approach 1:
The lateral connection approach is established during the manufacturing process before the device is stacked with other dies. By pre-forming lateral access pathways and connection points on the die edges or surfaces, the patent enables future access to buried conductors without requiring destructive separation of the stacked structure. This preliminary preparation maintains device integrity while enabling accessibility.
Data Source
AI summary
The present invention relates to a lateral via to provide an electrical connection to a buried conductor. In one instance, the buried conductor is a through via that extends along a first dimension, and the lateral via extends along a second dimension that is generally orthogonal to the first dimension. In another instance, the second dimension is oblique to the first dimension. Components having such lateral vias, as well as methods for creating such lateral vias are described herein.