Interconnect Regions With Dielectric Projections For High Density Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming electrical isolation around through-semiconductor interconnects are inadequate at high packing densities, as circular ring dielectrics fail to effectively isolate adjacent interconnects.
Innovation Solution
A new configuration of dielectric material is introduced, featuring triangular or bulbous projections around the interconnects, which are formed by etching and deposition processes to create voids and pinching off at vertex or stem regions, allowing for improved electrical isolation and stress management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circular ring dielectrics are used for electrical isolation, then the structure is simple and easy to manufacture, but electrical isolation effectiveness deteriorates at high packing densities
Solution Approach 1:
The patent transitions from symmetric circular ring dielectrics to asymmetric protruding dielectric structures with specific geometric features (protrusions extending toward adjacent interconnects). This asymmetric configuration provides superior electrical isolation by creating larger isolation gaps in critical directions while maintaining manufacturability through standard photolithography and deposition processes.
Solution Approach 2:
The invention adds dimensional complexity by introducing protrusions that extend laterally from the main dielectric body toward adjacent interconnects. This dimensional enhancement creates overlapping isolation regions that effectively block electrical fields at high packing densities, transforming a two-dimensional ring structure into a three-dimensional protruding structure.
2Productivity
If interconnects are packed at high densities, then productivity and circuit integration are improved, but electrical isolation between adjacent interconnects deteriorates
Solution Approach 1:
The dielectric structure is segmented into multiple functional regions: a main body providing bulk isolation and protrusions providing targeted isolation at specific locations. This segmentation allows the isolation structure to adapt to high-density packing by extending into the spaces between closely spaced interconnects, maintaining electrical isolation even when interconnect spacing is minimized.
Solution Approach 2:
The patent applies different dielectric properties locally through protrusions that extend toward adjacent interconnects only where needed for isolation. This local quality enhancement provides concentrated isolation strength at critical interfaces while maintaining overall dielectric continuity, enabling high-density packing without compromising electrical isolation at specific vulnerability points.
3Reliability
If protruding dielectric configurations are used, then electrical isolation and stress management are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The protruding dielectric structures are formed as part of the interconnect formation process itself, using preliminary patterning and deposition steps that define both the interconnect geometry and the dielectric protrusions simultaneously. This preliminary action integrates what could be separate complex steps into a unified process flow, reducing overall device complexity despite the enhanced isolation structure.
Data Source
AI summary
Some embodiments include interconnect regions. The regions may contain, along a cross section, a closed-shape interior region having an electrically conductive material therein, a first dielectric material configured as a liner extending entirely around a lateral periphery of the interior region, and at least two dielectric projections joining to the dielectric material liner and being laterally outward of the interior region. The dielectric projections may have an outer dielectric ring surrounding an inner dielectric region. The outer ring may consist of the first dielectric material and the inner dielectric region may be a composition different from a composition of the first dielectric material, and in some embodiments the composition within the inner dielectric region may be gaseous.