3D Stacked Capacitor Structure for Dense IC Etching Reliability
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Solution Overview
Problem
High integration density in semiconductor devices leads to increased variations in vapor deposition and etching processes, reducing the reliability of semiconductor devices due to decreased critical dimensions and increased pattern heights.
Innovation Solution
An integrated circuit device with a high-capacity capacitor structure is implemented, featuring conductive patterns and vias that are electrically connected in a specific configuration to enhance performance and integration density, using a single mask for etching conductive and dielectric layers to efficiently form the capacitor structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high integration density is implemented in semiconductor devices, then the performance and capacity of the device are improved, but the critical dimension and spacing of patterns are decreased while height and aspect ratio increase, causing variations in vapor deposition and etching processes
Solution Approach 1:
The capacitor structure is divided into multiple conductive patterns (first conductive patterns and second conductive patterns) that are sequentially stacked and spaced apart. This segmentation allows for better process control by creating distinct etching and deposition zones, reducing variations in manufacturing processes while maintaining high integration density.
Solution Approach 2:
The patent transitions from planar capacitor structures to three-dimensional stacked structures with conductive patterns arranged in multiple layers. By utilizing the vertical dimension, the design achieves high integration density without proportionally reducing critical dimensions, thereby mitigating manufacturing process variations.
2Productivity
If high integration density is implemented in semiconductor devices, then the performance and capacity of the device are improved, but the reliability of semiconductor devices is reduced due to increased variations in manufacturing processes
Solution Approach 1:
The capacitor structure divides conductive elements into separate first and second conductive patterns with alternating arrangement. This segmentation isolates manufacturing variations to specific regions, preventing cumulative errors and improving overall device reliability while maintaining high integration density.
Solution Approach 2:
The patent implements different spatial arrangements of conductive patterns at different locations within the capacitor structure. By optimizing the local configuration of first and second conductive patterns, the design compensates for manufacturing variations in specific regions, thereby improving overall reliability.
3Ease of manufacture
If traditional capacitor structures are used, then the manufacturing process is simpler, but the performance and integration density of the device are limited
Solution Approach 1:
The patent combines multiple capacitor units into a single integrated structure where first and second conductive patterns are sequentially stacked. This merging approach achieves high integration density while using standardized manufacturing processes, balancing complexity and performance.
Solution Approach 2:
The alternating first and second conductive patterns serve multiple functions: they form capacitor electrodes, provide electrical connections through vias, and enable scalable integration. This multi-functionality allows the structure to achieve high integration density without proportionally increasing manufacturing complexity.
Data Source
AI summary
An integrated circuit device, including a substrate; a lower insulating film; and a capacitor structure including: a plurality of first conductive patterns sequentially stacked on the lower insulating film; a plurality of second conductive patterns on the plurality of first conductive patterns; a first via at a first side of the capacitor structure, wherein the first via physically contacts and is electrically connected to the plurality of first conductive patterns, and is not electrically connected to the plurality of second conductive patterns; and a second via at a second side of the capacitor structure, wherein the second via physically contacts and is electrically connected to the plurality of second conductive patterns, and is not electrically connected to the plurality of first conductive patterns.