Semiconductor Memory Device Multi-Layer Dielectric Isolation
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Solution Overview
Problem
Current semiconductor memory devices face challenges in effectively isolating and protecting memory cells from interference and damage, particularly due to the limitations of existing dielectric materials in encapsulating memory elements and preventing oxygen diffusion.
Innovation Solution
A semiconductor device structure is proposed, featuring a first dielectric layer with a memory region and a peripheral region, where a second dielectric layer surrounds the memory element and part of the top electrode, providing isolation and protection, and a conductive interconnect is formed in a third dielectric layer, using materials like SiN, SiOyNz, and SiCOH to prevent oxygen diffusion and ensure thermodynamic stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing dielectric materials are used to encapsulate memory elements, then the structure is simple, but the isolation and protection effectiveness is insufficient and oxygen diffusion cannot be prevented
Solution Approach 1:
The encapsulation structure is divided into multiple dielectric layers (first dielectric layer, second dielectric layer, third dielectric layer) with different materials and functions. Each layer provides specific protection: the first layer provides base encapsulation, the second layer prevents oxygen diffusion, and the third layer provides additional isolation, collectively solving the insufficiency of single-layer encapsulation.
Solution Approach 2:
The patent employs composite dielectric structures combining different materials (e.g., SiN, SiOyNz, SiCOH) in multiple layers. This composite approach leverages the complementary properties of each material to achieve both effective isolation/protection and oxygen diffusion prevention, which single materials cannot accomplish alone.
2Productivity
If memory cells are closely integrated with circuit elements, then productivity is improved, but interference between memory cells increases
Solution Approach 1:
Multiple dielectric layers are introduced as intermediary structures between memory cells and between memory cells and circuit elements. These dielectric layers act as mediators that provide electrical isolation and prevent interference, enabling close integration of memory cells with transistors, passive components, and metal wires while maintaining functional independence.
Solution Approach 2:
The dielectric layers are strategically positioned in specific regions where interference occurs most critically. The encapsulation structure provides localized isolation exactly where needed around memory elements, allowing maximum integration density while preventing harmful interference in critical areas.
Data Source
AI summary
A semiconductor device may be provided, including a first dielectric layer having a first region and a second region laterally adjacent to the first region. The semiconductor device may further include a bottom electrode at least partially arranged within the first region of the first dielectric layer, a memory element arranged over the bottom electrode, a top electrode arranged over the memory element, and a second dielectric layer arranged over at least the first region of the first dielectric layer. The second dielectric layer may surround the memory element and may surround at least a part of the top electrode. The semiconductor device may further include a third dielectric layer arranged over the second region of the first dielectric layer and laterally adjacent to the second dielectric layer, and a conductive interconnect arranged in the third dielectric layer and the second region of the first dielectric layer.