MRAM Top Electrode Direct Metal Coupling
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Solution Overview
Problem
Conventional magnetoresistive random-access memory (MRAM) cells have a large overall height due to the use of contacts or vias between electrodes, which is not compatible with typical vertical spacing between metal layers, making them difficult to integrate into back-end-of-line (BEOL) process flows.
Innovation Solution
The top electrode of the MRAM cell is directly coupled to the overlying metal layer without a via or contact, reducing the overall height and allowing for more streamlined manufacturing techniques and better compatibility with BEOL processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacts or vias are used between electrodes in conventional MRAM cells, then electrical connection is achieved, but the overall height increases making it incompatible with typical vertical spacing between metal layers
Solution Approach 1:
The patent removes the via or contact structure from between the top electrode and the overlying metal layer. The top electrode is directly coupled to the metal layer without an intermediate via, extracting the unnecessary component that was increasing the overall height while maintaining the electrical connection function.
Solution Approach 2:
The top electrode and the overlying metal layer are merged or directly coupled together, eliminating the separate via structure. This merging reduces the number of discrete components and the overall vertical height while preserving the electrical connectivity between the electrode and the metal interconnect layer.
2Reliability
If via or contact structures are used, then electrical connection is established, but device complexity and manufacturing steps increase
Solution Approach 1:
The via or contact structure is extracted or removed from the device architecture. The top electrode is directly coupled to the metal layer without this intermediate structure, simplifying the overall device design and reducing manufacturing complexity while maintaining electrical connectivity.
Solution Approach 2:
The electrode and metal layer are merged or directly coupled, eliminating the separate via structure. This reduces the number of discrete components and simplifies the device architecture, making it more suitable for integration into BEOL process flows.
3Reliability
If conventional via structures are used, then electrical connection is achieved, but compatibility with BEOL process flows is reduced
Solution Approach 1:
The via structure is extracted or removed from the design, allowing the top electrode to be directly coupled to the metal layer. This simplification improves compatibility with BEOL process flows by eliminating structures that are difficult to integrate into back-end-of-line manufacturing processes.
Solution Approach 2:
The electrode and metal layer are merged or directly coupled, creating a simpler structure that is more adaptable to BEOL process flows. This direct coupling approach aligns better with standard semiconductor manufacturing processes used in back-end integration.
Data Source
AI summary
Some embodiments relate to an integrated circuit including a semiconductor substrate and an interconnect structure disposed over the semiconductor substrate. The interconnect structure includes a plurality of dielectric layers and a plurality of metal layers that are stacked over one another in alternating fashion. The plurality of metal layers include a lower metal layer and an upper metal layer disposed over the lower metal layer. A bottom electrode is disposed over and in electrical contact with the lower metal layer. A dielectric layer is disposed over an upper surface of the bottom electrode. A top electrode is disposed over an upper surface of the dielectric layer and is in direct electrical contact with a lower surface of the upper metal layer.