Stacked Trench MIM Capacitor Layout for Higher Capacitance Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The semiconductor industry faces challenges in increasing storage capacity, processing speed, and reducing costs while managing the complexity of scaling down passive and active semiconductor devices, such as capacitors, finFETs, and GAA FETs, which requires innovative approaches to enhance manufacturing efficiency and device performance.
Innovation Solution
The development of passive semiconductor devices with high-density capacitors formed in a stacked configuration, utilizing a metal-insulator-metal (MIM) configuration and trench capacitors, where conductive layers are separated by high-k dielectric layers and electrically connected in parallel, with contact structures formed overlapping trenches to increase trench density and surface area, thereby enhancing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional capacitor designs are used, then manufacturing complexity is lower, but capacitance density and storage capacity are insufficient
Solution Approach 1:
The patent transitions from planar capacitor structures to three-dimensional stacked configurations, where multiple capacitor layers are vertically arranged. This dimensional change increases capacitance density by utilizing vertical space, allowing multiple capacitive elements to occupy a smaller footprint area while maintaining manufacturability through standardized stacking processes
Solution Approach 2:
The patent implements nested capacitor structures where conductive layers and dielectric materials are arranged in concentric or overlapping patterns. Inner conductive elements are surrounded by dielectric layers, which are in turn surrounded by outer conductive layers, creating compact nested configurations that maximize capacitance within limited space without significantly increasing manufacturing complexity
2Quantity of substance
If device dimensions are scaled down to increase storage capacity, then storage capacity increases, but manufacturing complexity increases
Solution Approach 1:
The patent divides the capacitor structure into discrete, modular layers including separate conductive layers, dielectric layers, and interlayer structures. Each layer can be independently fabricated and controlled, allowing precise dimensional scaling while maintaining manufacturing simplicity through modular assembly processes rather than requiring monolithic miniaturization
Solution Approach 2:
The patent optimizes physical parameters such as dielectric constant (k-value), layer thickness, and material composition to achieve higher capacitance density without proportionally reducing all dimensions. By changing material parameters rather than purely geometric scaling, the patent increases storage capacity while avoiding the exponential increase in manufacturing complexity that would result from aggressive miniaturization
3Quantity of substance
If trench density is increased to enhance capacitance, then capacitance increases by 20% to 80%, but structural integrity may be compromised
Solution Approach 1:
The patent applies different material properties and structural characteristics to different regions of the trench structure. Support regions between trenches use materials with higher mechanical strength, while trench regions prioritize high-k dielectric materials for maximum capacitance. This local differentiation allows trench density to be increased by 2x to 3x while maintaining overall structural integrity through strategically placed support elements
Solution Approach 2:
The patent employs composite structures combining multiple materials with complementary properties. High-k dielectric materials are paired with mechanically robust conductive layers and support structures. The composite architecture allows dense trench arrangements to achieve 20%-80% capacitance enhancement while the combined material system provides both the electrical performance and mechanical strength required for high-density configurations
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 solution increases capacitance by 20% to 80% compared to traditional designs by doubling or tripling trench density, improving manufacturing efficiency and device performance without compromising structural integrity.
Implementation Method 1
first, second, third, and fourth conductive layers with first, second, and third high-k dielectric layers disposed between the conductive layers
Data Source
AI summary
A semiconductor device with capacitive structures and a method of fabricating the same are disclosed. The semiconductor device includes a substrate, first and second trenches disposed in the substrate and separated from each other by a substrate region of the substrate, first, second, and third conductive layers disposed in the first and second trenches and on the substrate region in a stacked configuration, a nitride layer including first and second nitride portions disposed on the first and second trenches and on the substrate region, and first and second contact structures configured to provide first and second voltages to the first and second conductive layers. The first nitride portion is disposed on the first conductive layer and on sidewalls of the second and third conductive layers. The second nitride portion is disposed on the second conductive layer and on sidewalls of the third conductive layers.