Semiconductor Memory Device Dummy Active Area Protection
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Solution Overview
Problem
Existing DRAM cells with recessed gate structures face manufacturing challenges and performance limitations due to defects, necessitating improvements in design and process technology to enhance integration, density, and reliability.
Innovation Solution
The semiconductor memory device incorporates a substrate with active areas arranged obliquely, featuring a dummy active area pattern in the periphery region that includes edge principal axis patterns and branches, where storage node contacts are placed on the long branches but not the short branches, expanding contact distribution and serving as a protective structure for the memory cell region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If storage node contacts are only arranged at both ends of active areas in memory cell regions, then the manufacturing process is simpler, but the protection of intermediate memory cell region components is insufficient
Solution Approach 1:
The patent extends the contact arrangement from the traditional one-dimensional positioning (only at both ends of active areas) to a two-dimensional distribution (including periphery regions and dummy active area patterns). This dimensional expansion allows storage node contacts to provide comprehensive protection for intermediate memory cell region components while maintaining manufacturing feasibility through systematic arrangement patterns.
Solution Approach 2:
The dummy active area pattern serves as an intermediary structure that facilitates the arrangement of storage node contacts in periphery regions. These dummy patterns act as mediators between the active areas and the storage node contacts, enabling the contacts to extend their protective function to intermediate memory cell region components without directly complicating the active area structure.
2Reliability
If storage node contacts are arranged on dummy active area patterns in periphery regions, then the protection function is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The dummy active area pattern is segmented into multiple distinct regions (first dummy active area patterns and second dummy active area patterns) with different functions. The first patterns are designed for storage node contact arrangement to provide protection, while the second patterns serve other purposes. This segmentation allows optimized manufacturing precision requirements for each segment, reducing overall complexity.
Solution Approach 2:
Different regions of the dummy active area patterns are designed with different local qualities and characteristics. The first dummy active area patterns have specific geometric features optimized for storage node contact arrangement and protection function, while the second patterns have different characteristics. This local quality differentiation enables tailored manufacturing precision requirements for each region, improving overall manufacturability.
Data Source
AI summary
The invention provides a semiconductor storage device including a substrate, a plurality of active areas which are arranged along an oblique direction, a dummy active area pattern, and the dummy active area pattern comprises a first edge principal axis pattern and a plurality of first long branches and a plurality of short branches connecting edge principal axis patterns, and a plurality of storage nodes are in contact with each other. According to the invention, a part of the storage node contacts are arranged on the dummy active area pattern, so that the difficulty of the manufacturing process can be reduced, and the surrounding storage node contacts can serve as protection structures to protect components and prevent the components from being physically or electrically affected.