3D Memory Fin Structure with Staircase Contact Region
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Solution Overview
Problem
The increasing demand for higher memory cell density in integrated circuits poses challenges in effectively contacting memory cells, particularly in three-dimensional integration, where existing technologies struggle to efficiently manage the complex interconnectivity and density requirements.
Innovation Solution
The integration of a fin structure with a staircase contact region that allows for parallel displacement of contact regions, enabling efficient electrical contact between stacked memory cell structures, which includes a charge storage layer structure and switch arrangement with normally-off and normally-on transistors for selective memory cell access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cell density is increased through three-dimensional integration, then memory capacity improves, but contact and interconnect complexity increases
Solution Approach 1:
The patent transitions from planar contact regions to three-dimensional contact structures. Contact regions are formed at multiple heights corresponding to different memory cell layers, enabling vertical interconnection through the stacked memory cell structures. This dimensional transition allows efficient contacting of high-density 3D memory cells without proportionally increasing contact complexity.
Solution Approach 2:
The contact region is segmented into multiple discrete contact regions, each associated with a specific memory cell layer. These segmented contacts are formed at different heights and positions, allowing independent optimization of each contact region while collectively serving the entire stacked memory structure.
2Productivity
If contact regions are displaced in parallel directions to access stacked memory cells, then electrical contact efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent forms a common base structure before creating the displaced contact regions. This preliminary base structure serves as a reference framework that guides subsequent contact formation processes, ensuring that displaced contacts at different heights maintain proper relative positioning without requiring extremely tight absolute alignment tolerances.
Solution Approach 2:
The contact regions are nested within a hierarchical structure where a common base structure contains multiple displaced contact regions at different levels. Each contact region is positioned relative to the base structure and to other contacts in a nested arrangement, which simplifies the manufacturing process compared to requiring precise direct alignment between all contact pairs.
Data Source
AI summary
In an embodiment, an integrated circuit having a memory cell arrangement is provided. The memory cell arrangement may include a substrate, a fin structure disposed above the substrate, and a memory cell contacting region. The fin structure may include a memory cell region having a plurality of memory cell structures being disposed above one another, each memory cell structure having an active region of a respective memory cell. Furthermore, the memory cell contacting region may be configured to electrically contact each of the memory cell structures, wherein the memory cell contacting region may include a plurality of contact regions, which are at least partially displaced with respect to each other in a direction parallel to the main processing surface of the substrate.