Semiconductor Memory Cell Segmentation for Packing Density
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Solution Overview
Problem
Conventional semiconductor devices with one-time programmable (OTP) or multi-time programmable (MTP) technologies have large cell sizes, which lower the packing density of device components in IC chips, making them less efficient for multi-bit programming.
Innovation Solution
The semiconductor device incorporates a configuration with a dielectric layer contacting diffusion blocks and structures, allowing a single gate to control multiple diffusion structures and blocks, enabling smaller cell sizes and increased packing density by arranging gates and diffusion blocks in an alternating manner, facilitating multi-bit programming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OTP/MTP technologies are used for programming memory devices, then the devices can be programmed with data retention capability, but the cell sizes become large which lowers the packing density of device components in IC chips
Solution Approach 1:
The memory cell is segmented into distinct functional blocks: diffusion blocks (source/drain regions), diffusion structures (channel regions), and gate structures. This segmentation allows each component to be optimized independently for its specific function while maintaining overall compactness. The diffusion blocks are separated by diffusion structures, creating a modular architecture that reduces total cell area compared to conventional designs.
Solution Approach 2:
The patent utilizes vertical stacking and three-dimensional arrangement of components. The dielectric layer is positioned between diffusion blocks at different vertical levels, and gate structures extend in multiple dimensions. This 3D configuration allows more components to be packed into a smaller planar footprint, effectively reducing cell size while maintaining data retention capability through proper electrical isolation.
2Reliability
If conventional OTP/MTP technologies are used for programming memory devices, then the devices can store binary information, but the large cell sizes lower the packing density of device components in IC chips
Solution Approach 1:
The patent merges multiple functional elements into a compact integrated structure. Diffusion blocks and diffusion structures are combined in an alternating arrangement with gates positioned between them. The dielectric layer serves dual purposes: electrical isolation between diffusion blocks and structural support for gate positioning. This merging of functions into a single integrated cell structure achieves high packing density while maintaining binary information storage capability.
Solution Approach 2:
The gate structure serves multiple functions: controlling current flow between diffusion blocks, defining the active channel region, and providing a platform for word line connections. The diffusion structures serve both as channel regions and as isolation elements between adjacent diffusion blocks. This multi-functionality reduces the number of separate components needed, thereby increasing packing density without sacrificing storage reliability.
Data Source
AI summary
The present disclosure generally relates to semiconductor devices, and more particularly, to semiconductor devices having memory cells for multi-bit programming and methods of forming the same. The present disclosure also relates to a method of forming such semiconductor devices. The disclosed semiconductor devices may achieve a smaller cell size as compared to conventional devices, and therefore increases the packing density of the disclosed devices.