MIM Capacitor Damascene Structure Etch Stop Integration
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Solution Overview
Problem
The conventional process for integrating metal-insulator-metal (MIM) capacitors with interconnection structures is complex and costly due to the need for multiple insulating and metal layers, increasing production costs and structural complexity.
Innovation Solution
A MIM capacitor structure featuring a first and second damascene electrode layer separated by a single or multilayer insulating barrier, where the insulating barrier serves as both an insulator and etch stop, simplifying the manufacturing process and reducing costs by eliminating the need for extra dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulating layers and metal layers are used to integrate MIM capacitor with interconnection structure, then electrical connection is achieved, but production cost increases and structure becomes complicated
Solution Approach 1:
The patent combines the insulating barrier layer of the MIM capacitor with the etch stop layer of the interconnection structure into a single integrated layer. This merging eliminates the need for separate insulating and etch stop layers, thereby reducing structural complexity and production cost while maintaining reliable electrical connection functionality.
Solution Approach 2:
The insulating barrier layer is designed to serve multiple functions simultaneously: it acts as the insulating barrier for the MIM capacitor and as the etch stop layer for the interconnection structure. This multi-functionality reduces the total number of layers required, simplifying the overall structure while ensuring proper electrical isolation and etching control.
2Reliability
If multiple insulating layers and metal layers are used to integrate MIM capacitor with interconnection structure, then electrical connection is achieved, but production cost increases
Solution Approach 1:
The patent merges the insulating barrier layer with the etch stop layer into a single layer structure. This consolidation reduces the number of deposition and etching steps required in the manufacturing process, directly lowering production cost while maintaining the necessary electrical connection reliability.
Solution Approach 2:
By designing the insulating barrier layer to perform dual functions as both capacitor insulator and etch stop, the patent eliminates redundant manufacturing steps. This multi-functional design reduces material deposition cycles and process complexity, thereby decreasing production cost without compromising electrical connection quality.
3Reliability
If conventional integration process with multiple layers is used, then MIM capacitor can be integrated with interconnection structure, but manufacturing process becomes complex
Solution Approach 1:
The patent combines the insulating barrier function and etch stop function into a single integrated layer, eliminating the need for separate deposition and etching steps for each layer. This merging simplifies the manufacturing process flow while ensuring reliable integration between the MIM capacitor and interconnection structure.
Solution Approach 2:
The insulating barrier layer is engineered to serve dual purposes: providing electrical isolation for the capacitor and acting as an etch stop during interconnection structure fabrication. This multi-functionality reduces the total number of manufacturing steps required, making the integration process simpler and more efficient.
Data Source
AI summary
A metal-insulator-metal (MIM) capacitor structure includes a first dielectric layer, a first damascene electrode layer, an insulating barrier layer, a second dielectric layer and a second damascene electrode layer. The first damascene electrode layer is formed in the first dielectric layer. The insulating barrier layer covers the first dielectric layer and the first damascene electrode layer, and is a single layer structure. The second dielectric layer is formed on the insulating barrier layer. The second damascene electrode layer is formed in the second dielectric layer and is contacted with the insulating barrier layer. The MIM capacitor structure can includes a dual damascene structure formed in the second dielectric layer and the insulating barrier layer and electrically connected to the first damascene electrode layer. A method for manufacturing the MIM capacitor structure is also provided.