Semiconductor Memory Cell Gate Structure Design
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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, hindering the industry's goal of higher density, performance, and lower costs at nanometer-scale process nodes.
Innovation Solution
A semiconductor device is designed with an isolation region, diffusion structures, and gate structures electrically coupled through dielectric layers, allowing for reduced cell size and increased packing density by configuring gate structures between pairs of diffusion structures, enabling multi-bit programming with smaller cell sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OTP or MTP programming technologies are used, then data retention capability is improved, but cell size increases which lowers packing density
Solution Approach 1:
The gate structure is nested within the cavity formed between the pair of diffusion structures, with the gate entirely contained within the isolation region. This nesting approach allows the memory cell components to be tightly integrated within a compact footprint, achieving small cell size while maintaining OTP/MTP programming capability for data retention
Solution Approach 2:
The invention transitions from a planar layout to a three-dimensional structure by forming a cavity between diffusion structures and placing the gate structure within this vertical space. The gate structure extends in the vertical dimension rather than only laterally, enabling compact cell size while preserving the programming functionality needed for data retention
2Area of stationary object
If cell size is reduced, then packing density is improved, but device complexity increases due to nanometer-scale process requirements
Solution Approach 1:
The memory cell is segmented into distinct functional regions: diffusion structures forming the cavity walls, dielectric material filling the cavity, and a separately formed gate structure within the cavity. This segmentation allows each component to be optimized independently and simplifies the fabrication process by enabling modular construction at nanometer scales
Solution Approach 2:
The dielectric material acts as an intermediary between the diffusion structures and the gate structure, providing electrical isolation and mechanical support. This intermediary layer simplifies the overall device architecture by clearly defining boundaries and reducing direct interactions that would complicate the manufacturing process
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 provides a semiconductor device including an isolation region disposed on a substrate, a pair of diffusion structures disposed upon the isolation region, a dielectric layer that covers side surfaces of the diffusion structures, and a gate structure disposed on the dielectric layer and between the diffusion structures, where the gate structure is electrically coupled to the diffusion structures.