X-Shaped Semiconductor Capacitor Via Plug Placement
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Solution Overview
Problem
Existing semiconductor capacitor structures with MIM type designs require extra conducting wire structures for electrical connections across metal layers, leading to complex wiring and reduced unit capacitance due to limited via plug positioning.
Innovation Solution
A semiconductor capacitor structure with strategically positioned via plugs that electrically connect electrode sections across multiple metal layers without additional conducting wires, utilizing a dielectric layer and interdigitated metal patterns to enhance capacitance and simplify wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extra conducting wire structures are used to connect electrode sections across metal layers, then electrical connections can be established, but wiring complexity increases and unit capacitance decreases
Solution Approach 1:
The patent merges the via plug structure with the electrode pattern itself. The via plugs are positioned at the intersections of perpendicular metal lines, allowing the same structural element to serve both as electrical connection and as part of the electrode pattern, thereby eliminating the need for separate conducting wire structures
Solution Approach 2:
The via plugs serve multiple functions simultaneously: they provide electrical connections between metal layers, acts as part of the electrode pattern for capacitance generation, and serve as alignment references for subsequent processing steps. This multi-functionality reduces overall device complexity while maintaining reliable electrical connections
2Reliability
If via plugs are positioned at the periphery of electrodes, then electrical connections can be made, but unit capacitance is reduced due to limited positioning options
Solution Approach 1:
The patent transitions from peripheral via plug positioning (one-dimensional constraint) to intersection-based positioning (two-dimensional utilization). By placing via plugs at the intersections of perpendicular metal lines, the design充分利用 the available space within the electrode area, maximizing the effective capacitance-generating region while maintaining proper electrical connections
Solution Approach 2:
The via plugs are strategically positioned at specific locations (intersections of metal lines) rather than uniformly distributed or confined to periphery. This localized positioning optimizes the electrical field distribution and maximizes the effective capacitance area by utilizing the intersections as active electrode regions
3Quantity of substance
If interdigitated metal patterns are used, then capacitance can be increased, but additional conducting wires are required for electrical connections
Solution Approach 1:
The patent combines the interdigitated metal patterns with the via plug connection structures. The metal lines forming the interdigitated pattern serve dual purposes: generating capacitance through their interdigitated arrangement and providing pathways for electrical connections through their intersections, eliminating the need for separate conducting wires
Data Source
AI summary
A semiconductor capacitor structure includes a first metal layer, a second metal layer, a first set of via plugs, a second set of via plugs, and a dielectric layer. The first metal layer includes a first portion, a plurality of parallel-arranged second portions, a third portion, and a plurality of parallel-arranged fourth portions. The second metal layer includes a fifth section, a plurality of sixth sections, a seventh section, and a plurality of eighth sections. The first set of via plugs electrically connects the plurality of second sections to the plurality of sixth sections. The second set of via plugs electrically connects the plurality of fourth sections to the plurality of eighth sections.