Trench Capacitor With Dielectric Isolation For Parasitic Reduction
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Solution Overview
Problem
Semiconductor manufacturers face challenges in integrating capacitors with large capacitance values on a semiconductor die due to space constraints and parasitic coupling issues, which limit frequency of operation and increase cross-talk.
Innovation Solution
A semiconductor structure with a dielectric structure that utilizes the vertical dimension to increase capacitor area while minimizing surface area, incorporating a trench capacitor with a thick dielectric layer between conductive electrodes and the substrate to reduce parasitic capacitance and enhance isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large capacitance values are integrated on a semiconductor die, then capacitor area increases, but die area consumption increases leading to increased cost
Solution Approach 1:
The patent transitions from planar capacitor structures to three-dimensional trench capacitors that extend vertically into the substrate. By utilizing the vertical dimension, the capacitor achieves large capacitance values without proportionally increasing the surface area consumed on the die, thereby resolving the contradiction between capacitance value and die area consumption.
2Quantity of substance
If trench capacitors are formed in a conductive semiconductor substrate, then vertical dimension is utilized to increase capacitor area, but parasitic coupling between capacitor and conductive substrate increases leading to reduced frequency of operation
Solution Approach 1:
The patent introduces a dielectric material as an intermediary layer between the capacitor electrodes and the conductive semiconductor substrate. This dielectric layer acts as a mediator that eliminates direct conductive coupling, thereby reducing parasitic capacitance while allowing the trench capacitor to maintain its vertical structure and large effective area.
3Productivity
If conductive components are placed in close proximity to each other, then integration density increases, but interaction between components occurs resulting in cross-talk and reduced frequency of operation
Solution Approach 1:
The patent employs dielectric materials as intermediary layers that physically and electrically isolate conductive components from each other. These dielectric layers prevent harmful electromagnetic interactions and cross-talk between adjacent conductive elements, allowing higher integration density without compromising signal integrity or frequency of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for high-capacity capacitors with reduced parasitic capacitance, increased operational frequency, and decreased cross-talk, enabling more efficient integration of capacitors on semiconductor dies.
Implementation Method 1
The conductive substrate results in parasitic coupling between the capacitor and the conductive substrate or other conductive elements, leading to a reduction in the frequency of operation of the circuit
Implementation Method 2
capacitors and other passive components may be physically and electrically isolated from each other and from other conductive components including conductive components of active devices
Data Source
AI summary
In various embodiments, semiconductor structures and methods to manufacture these structures are disclosed. In one embodiment, a capacitor embedded in a dielectric material below the surface of a semiconductor substrate is disclosed. Other embodiments are described and claimed.