Interdigitated Capacitor Structure with Vertical Vias
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Solution Overview
Problem
Traditional semiconductor capacitors face challenges such as excessive area consumption, low capacitance density, and high fabrication costs as device sizes decrease, making them inefficient for modern IC manufacturing.
Innovation Solution
The development of an interdigitated semiconductor capacitor structure with an anode and cathode component formed by interconnect layers, where conductive features are interdigitated along both the Y and Z axes, and a shield structure is introduced to reduce energy loss and increase the quality factor of the capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional metal-on-metal capacitor structure is used, then fabrication process is simple, but area consumption is excessive and capacitance density is low
Solution Approach 1:
The patent transitions from traditional planar metal-on-metal capacitor structure to a vertical interdigitated structure that utilizes the Z-axis (vertical dimension). Conductive features are stacked in multiple layers with alternating polarity, creating capacitance through vertical and lateral interfaces. This dimensional change allows significant capacitance increase within the same footprint area, directly resolving the area consumption problem while maintaining compatibility with standard semiconductor fabrication processes.
Solution Approach 2:
The patent implements nested conductive features where smaller conductive elements are positioned within or between larger conductive structures across multiple layers. The interdigitated pattern creates nested configurations where conductive fingers from different layers interlock and interface with each other, maximizing the use of available space. This nesting approach increases capacitance density by utilizing three-dimensional space efficiently without requiring excessive fabrication complexity.
2Ease of manufacture
If traditional metal-on-metal capacitor structure is used, then fabrication process is simple, but capacitance density is low
Solution Approach 1:
The patent transitions from traditional planar metal-on-metal capacitor structure to a vertical interdigitated structure that utilizes the Z-axis (vertical dimension). Conductive features are stacked in multiple layers with alternating polarity, creating capacitance through vertical and lateral interfaces. This dimensional change allows significant capacitance increase within the same footprint area, directly resolving the area consumption problem while maintaining compatibility with standard semiconductor fabrication processes.
Solution Approach 2:
The patent employs composite capacitor structures combining multiple conductive materials and dielectric layers in the interdigitated configuration. Different metal layers may use different conductive materials optimized for specific functions, while dielectric materials are positioned between conductive features to maximize capacitance. This composite approach increases capacitance density by utilizing material properties effectively across multiple layers and interfaces, while still using standard semiconductor fabrication techniques.
3Loss of energy
If shield structure is added to reduce energy loss, then quality factor increases, but device complexity increases
Solution Approach 1:
The patent integrates the shield structure with the existing interdigitated capacitor layers rather than adding it as a separate external component. The shielding conductive features are merged with the capacitor's metal layers and dielectric structure, forming a unified design where the shield is part of the capacitor assembly itself. This merging approach reduces energy loss through shielding while minimizing the increase in device complexity, as the shield utilizes the same fabrication layers and processes as the capacitor structure.
Solution Approach 2:
The patent designs the interconnect layers and conductive features to serve multiple functions simultaneously. The same metal layers and dielectric structures that form the capacitor also provide shielding functions, mechanical support, and electrical interconnection. This multi-functionality approach means that adding shielding capability does not require separate dedicated shield layers or additional fabrication steps, thereby reducing energy loss while keeping device complexity manageable through functional integration.
Data Source
AI summary
The present disclosure provides a semiconductor device. The semiconductor device includes a substrate having a surface that is defined by a first axis and a second axis perpendicular to the first axis; and a capacitor disposed on the substrate, the capacitor having an anode component that includes a plurality of first conductive features and a cathode component that includes a plurality of second conductive features. The first conductive features and the second conductive features each include two metal lines extending along the first axis. At least one metal via extending along a third axis that is perpendicular to the surface of the substrate and interconnecting the two metal lines. The first conductive features are interdigitated with the second conductive features along both the second axis and the third axis.