Propeller-Shaped Capacitor Plates for High Density
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Solution Overview
Problem
Current methods for fabricating capacitors in semiconductor devices are inefficient in maximizing capacitance within limited chip real estate, as they do not effectively utilize space and require additional etch and lithography processes.
Innovation Solution
The use of propeller-shaped capacitor plates connected by via portions in multiple conductive layers, allowing for increased capacitance without the need for additional etch processes and efficient use of semiconductor device area, achieved through a dual damascene process and existing mask levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional capacitor fabrication methods are used, then the manufacturing process is simpler, but the capacitance per unit area is lower
Solution Approach 1:
The patent transitions from planar capacitor plates to three-dimensional propeller-shaped structures with vertical extensions. The capacitor plates are formed in multiple conductive layers (first, second, and third conductive layers) with via portions connecting them, creating a vertical stacking architecture. This multi-layer approach increases the effective capacitance area without proportionally increasing the chip footprint, directly resolving the contradiction between maximizing capacitance and minimizing chip area.
Solution Approach 2:
The capacitor plate is divided into multiple propeller-shaped portions (first, second, third, and fourth portions) distributed across different conductive layers. Each propeller-shaped portion consists of multiple blades radiating from a central region, creating segmented structures that can be efficiently packed. This segmentation allows for increased total capacitance within the available area by utilizing both horizontal and vertical space distribution.
2Quantity of substance
If additional etch and lithography processes are used to increase capacitance, then the capacitance increases, but the manufacturing complexity increases
Solution Approach 1:
The propeller-shaped capacitor plate structures serve multiple functions: they provide the capacitive elements, define the conductive patterns, and utilize existing via structures for inter-layer connections. The same conductive layers and via portions that would be created for other circuit elements are also used to form the capacitor plates, eliminating the need for dedicated etch and lithography processes solely for capacitor fabrication. This multi-functionality increases capacitance without proportionally increasing manufacturing complexity.
Data Source
AI summary
Semiconductor devices and methods of manufacture thereof are disclosed. In a preferred embodiment, a capacitor plate includes a first propeller-shaped portion and a second propeller-shaped portion. A via portion is disposed between the first propeller-shaped portion and the second propeller-shaped portion.