Stacked Capacitor Semiconductor Structure for Higher Capacitance

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Solution Overview

Problem

Existing semiconductor structures are inadequate in miniaturization due to the larger size of capacitor structures, which hinders the development of smaller, high-performance integrated circuits with lower power-supply voltages and higher frequencies.

Innovation Solution

The semiconductor structure incorporates multiple semiconductor substrates with capacitor structures embedded or stacked within and on each substrate, utilizing conductive pillars to electrically couple them, thereby increasing capacitance without increasing the overall thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If capacitor structures are made larger to increase capacitance, then capacitance is improved, but area occupied increases

Engineering Contradiction:
ImprovecapacitanceVSAvoidarea occupied by capacitor
Core Design Contradiction:
Quantity of substanceVSArea of stationary object

Solution Approach 1:

The patent transitions from planar capacitor arrangements to three-dimensional stacked configurations. Multiple capacitor structures are vertically stacked across multiple semiconductor substrates, utilizing the vertical dimension to increase total capacitance without expanding the horizontal footprint. This dimensional transition directly resolves the contradiction by decoupling capacitance scaling from area occupation.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements nested capacitor structures where capacitors are embedded within semiconductor substrates, and multiple substrates are stacked together. The capacitors are nested inside the substrate volume, and substrates are nested in a vertical stack, creating a compact nested arrangement that maximizes capacitance within a confined space envelope.

Inventive Principle:
Principle #7Nested doll (Nesting)

2Quantity of substance

If more capacitor structures are added to increase total capacitance, then capacitance is improved, but device complexity increases

Engineering Contradiction:
Improvetotal capacitanceVSAvoidstructural complexity
Core Design Contradiction:
Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent divides the capacitor system into multiple discrete capacitor structures distributed across separate semiconductor substrates. Each substrate contains individual capacitor elements that can be independently designed and manufactured, then assembled into a stacked configuration. This segmentation allows complex total capacitance to be achieved through modular assembly rather than a single complex structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The stacked semiconductor substrate structure serves multiple functions simultaneously: it provides mechanical support, electrical isolation through dielectric layers, capacitive storage through embedded capacitors, and thermal management pathways. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving high total capacitance.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230420492A1Semiconductor structure
Publication Date: 2023.12.28 MEDIATEK SINGAPORE PTE LTD
  • US20230420492A1 patent drawing
  • US20230420492A1 patent drawing
  • US20230420492A1 patent drawing

AI summary

A semiconductor structure includes a first semiconductor substrate, a plurality of first capacitor structures, a first dielectric layer, a second semiconductor substrate, a plurality of second capacitor structures, and a plurality of conductive pillars. The first capacitor structures are disposed in the first semiconductor substrate and arranged side-by-side. The first dielectric layer covers the first capacitor structures. The second semiconductor substrate is disposed over the first dielectric layer. The second capacitor structures are disposed in the second semiconductor substrate and arranged side-by-side. The conductive pillars extend in the first dielectric layer and electrically couple the first capacitor structures to the second capacitor structures.