DRAM Memory Device With Different Capacitor Sizes
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Solution Overview
Problem
The increasing complexity in manufacturing and integration of dynamic random access memories (DRAMs) leads to deficiencies in memory device performance, necessitating improvements in structure and manufacturing processes to enhance packing densities and storage capacities.
Innovation Solution
A memory device structure incorporating capacitors of different sizes and dielectric materials in adjacent active regions, allowing for multiple levels of storage capacities and improved overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dimensions of DRAM memory cells are continuously shrunk to increase packing densities, then the memory storage capacity increases, but the manufacturing and integration complexity increases
Solution Approach 1:
The patent applies local quality by implementing different capacitor types (first capacitors and second capacitors) in different active regions (first active regions and second active regions) of the semiconductor substrate. This allows different portions of the memory device to have different characteristics optimized for specific functions, enabling increased storage capacity without uniformly increasing complexity across the entire device.
Solution Approach 2:
The memory device is segmented into multiple active regions with different capacitor types, where each region can be independently manufactured and integrated. This segmentation allows for modular manufacturing processes, reducing overall complexity while maintaining high storage capacity through the combination of different capacitor configurations.
2Quantity of substance
If capacitors of different sizes and materials are used in adjacent active regions, then storage capacities are enhanced, but device structure complexity increases
Solution Approach 1:
Different capacitor structures (first capacitors with first dielectric materials and second capacitors with second dielectric materials) are implemented in different active regions to provide locally optimized storage characteristics. This allows each region to contribute differently to the overall storage capacity while maintaining a systematic architecture that manages structural complexity.
Solution Approach 2:
The patent uses composite materials by combining different dielectric materials in different capacitor types within the same memory device. This allows for enhanced storage capacity through the complementary properties of different materials while maintaining a unified device architecture that manages overall structural complexity.
3Ease of manufacture
If manufacturing processes are simplified to reduce complexity, then ease of manufacture improves, but memory storage capacity may be limited
Solution Approach 1:
The manufacturing process is segmented into standardized steps that can be repeatedly applied across different active regions. By dividing the device into modular active regions with similar fabrication sequences, the ease of manufacture is improved through process repetition and standardization, while storage capacity is scaled by increasing the number of regions.
Data Source
AI summary
A memory device includes a semiconductor substrate having a first active region and a second active region adjacent to the first active region. The memory device also includes a first word line extending across the first active region and the second active region. The memory device further includes a first source/drain region in the first active region and a second source/drain region in the second active region disposed at opposite sides of the first word line. In addition, the memory device includes a first capacitor disposed over and electrically connected to the first source/drain region in the first active region, and a second capacitor disposed over and electrically connected to the second source/drain region in the second active region. The first capacitor and the second capacitor have different sizes.