Capacitor Electrode Structure for IC Miniaturization Capacitance Retention
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Solution Overview
Problem
Existing integrated circuit devices face challenges in maintaining desired electrical characteristics and capacitance as capacitors are miniaturized during semiconductor device down-scaling.
Innovation Solution
The integrated circuit device incorporates a structure with a conductive multifunction plug having an extended landing pad portion and an extended lower electrode portion, along with a dielectric layer, to increase the height of the lower electrode, ensuring increased capacitance and electrical characteristics even with reduced capacitor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor size is reduced during miniaturization, then the integrated circuit device density increases, but the capacitance decreases
Solution Approach 1:
The patent extends the lower electrode vertically by forming an extended lower electrode portion that protrudes from the main body of the lower electrode. This vertical extension increases the effective surface area of the lower electrode without increasing the horizontal footprint of the capacitor, thereby maintaining capacitance while reducing the overall capacitor area. The extended portion creates additional capacitance by forming a larger interface with the dielectric layer.
Solution Approach 2:
The lower electrode is divided into two distinct portions: a main body portion and an extended lower electrode portion. The extended portion is formed as a separate structure that protrudes from the main body, allowing independent optimization of each portion. The main body provides the primary electrode function while the extended portion specifically addresses the capacitance requirement, enabling the capacitor to maintain desired electrical characteristics at reduced size.
2Volume of moving object
If the capacitor size is reduced, then the device footprint decreases, but the electrical characteristics deteriorate
Solution Approach 1:
By extending the lower electrode in the vertical dimension rather than increasing horizontal dimensions, the patent maintains excellent electrical characteristics including capacitance and conductivity within a reduced footprint. The vertical extension provides additional surface area for charge storage without compromising the electrical performance of the capacitor.
Solution Approach 2:
The extended lower electrode portion is strategically positioned to provide enhanced local capacitance where needed. This localized extension allows the capacitor to maintain desired electrical characteristics by concentrating the capacitance-enhancing structure at the critical interface between the lower electrode and dielectric layer, while the rest of the capacitor structure remains compact.
3Quantity of substance
If the lower electrode height is increased, then the capacitance increases, but the manufacturing complexity increases
Solution Approach 1:
The extended lower electrode portion is formed as an integral extension of the main lower electrode body, creating a unified structure that combines the functions of both the main electrode and the extended capacitance-providing portion. This merged structure is formed in a single continuous conductive material layer, simplifying manufacturing by eliminating the need for separate fabrication steps for the extended portion while still providing increased capacitance through the extended geometry.
Solution Approach 2:
The extended lower electrode portion serves multiple functions: it increases the capacitance by providing additional surface area, maintains electrical continuity with the main lower electrode, and integrates with the existing capacitor structure without requiring separate fabrication processes. This multi-functional design achieves capacitance enhancement while minimizing manufacturing complexity.
Data Source
AI summary
An integrated circuit device includes a substrate having an active region, a conductive landing pad at a first vertical level above the substrate and connected to the active region, a capacitor including a lower electrode at a second vertical level higher than the first vertical level above the substrate, and a conductive multifunction plug including an extended landing pad portion at a third vertical level between the first vertical level and the second vertical level and contacting the conductive landing pad, and an extended lower electrode portion integrally connected to the extended landing pad portion and contacting the lower electrode. The capacitor further includes a dielectric layer covering a surface of the lower electrode and the extended lower electrode portion of the conductive multifunction plug.