Hollow Conductive Pattern Lower Electrode for MIM Capacitor
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Solution Overview
Problem
The limited effective area of the lower electrode in metal-insulator-metal (MIM) structures restricts memory capacitance, leading to low performance in smaller memory devices due to the restricted structure of the capacitor.
Innovation Solution
A semiconductor device is fabricated with a conductive pattern having a hollow structure and a multiple-layers structure for the lower electrode, comprising a substrate, a conductive pattern, a first conductive layer, and a dielectric layer, where the conductive pattern extends upwardly from the substrate and is covered by the first conductive layer, which serves as the lower electrode for a capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a traditional MIM capacitor structure is used, then the device structure is simple, but the effective area of the lower electrode is limited leading to low memory capacitance
Solution Approach 1:
The patent applies nesting by placing a first conductive layer inside a second conductive layer, forming a nested multi-layer lower electrode structure. The first conductive layer is positioned within the second conductive layer, creating a nested configuration that significantly increases the effective area of the lower electrode without proportionally increasing device complexity, thereby improving memory capacitance.
Solution Approach 2:
The patent transitions from a traditional planar single-layer lower electrode to a multi-layer lower electrode structure with vertical stacking. By adding the first conductive layer within the second conductive layer and introducing vertical dimensionality, the effective area is expanded from two-dimensional to three-dimensional space, significantly increasing memory capacitance while maintaining reasonable structural complexity.
2Quantity of substance
If the lower electrode area is increased to improve memory capacitance, then memory capacitance increases, but the device size increases
Solution Approach 1:
The patent utilizes vertical stacking of conductive layers to increase the effective area of the lower electrode in the vertical dimension rather than expanding horizontally. The first conductive layer is positioned within the second conductive layer, allowing the effective area to increase without proportionally increasing the lateral device footprint, thus improving memory capacitance while controlling device size.
Solution Approach 2:
By nesting the first conductive layer within the second conductive layer, the patent achieves increased effective area within a compact vertical space. This nested configuration allows the lower electrode to occupy more effective area without requiring proportional increases in device volume, effectively decoupling capacitance improvement from device size expansion.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a substrate, a conductive pattern, a first conductive layer, and a dielectric layer. The conductive pattern extends upwardly from the substrate. The conductive pattern has a hollow structure. The first conductive layer covers the conductive pattern. The dielectric layer at least covers the first conductive layer.