Semiconductor Trench Isolation Layout for SRAM Misalignment Leakage
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Solution Overview
Problem
Conventional SRAM devices suffer from poor electrical performance due to misalignment issues during the photolithography process, leading to leakage and bridging between conductive structures, which affects the overall performance of the semiconductor device.
Innovation Solution
A semiconductor device fabrication method involving the formation of a first trench with specific size and angle configurations, where a first conductive structure is placed in the second region and an insulation layer is formed in the first region, allowing for controlled distance adjustment between conductive structures and preventing short-circuiting, thereby enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography alignment is used, then manufacturing process is simple, but conductive structures experience misalignment leading to leakage and bridging
Solution Approach 1:
The patent divides the trench into two distinct regions: a first region filled with dielectric material and a second region filled with conductive material. This segmentation allows different functional zones within the same trench structure, enabling precise control over conductive structure positioning while maintaining manufacturing feasibility. The first region acts as an isolation zone that prevents bridging, while the second region provides the conductive pathway, thus resolving the alignment precision issue without excessive complexity.
Solution Approach 2:
The patent introduces a dielectric layer as an intermediary substance between adjacent conductive structures. This dielectric layer fills the first region of the trench and serves as a physical barrier that prevents electrical leakage and bridging between conductive elements. The intermediary dielectric material enables reliable electrical isolation, solving the leakage problem inherent in conventional alignment methods.
2Productivity
If conductive structures are placed close together to improve integration, then device density increases, but leakage and bridging between structures occur
Solution Approach 1:
By segmenting the trench into a first dielectric region and a second conductive region, the patent enables closely spaced conductive structures to be placed adjacent to each other while maintaining reliable electrical isolation. The dielectric first region acts as a built-in isolation barrier, allowing higher integration density without sacrificing electrical performance or causing leakage between adjacent conductive elements.
Solution Approach 2:
The dielectric layer serving as an intermediary substance between conductive structures enables high-density integration by providing reliable electrical isolation. This intermediary dielectric material allows conductive structures to be positioned closer together, improving device productivity and integration density, while simultaneously preventing leakage and maintaining electrical reliability.
3Manufacturing precision
If minimum distance between conductive structures is maintained to prevent leakage, then manufacturing precision requirements are reduced, but device integration density decreases
Solution Approach 1:
The segmented trench structure with a dedicated dielectric first region provides built-in isolation that reduces sensitivity to alignment variations. This segmentation allows conductive structures to be placed closer together with relaxed manufacturing precision requirements, as the dielectric barrier ensures leakage prevention even with moderate alignment tolerances, thereby improving both manufacturing feasibility and integration density.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a base substrate; and a first gate structure and doped source/drain layers on the base substrate. The doped source/drain layers are on both sides of the first gate structure. The semiconductor device further includes a dielectric layer on a surface of the base substrate. The dielectric layer covers the doped source/drain layers, and the dielectric layer contains a first trench on the doped source/drain layer. The first trench includes a first region filled by an insulation layer and a second region filled by first conductive structure under the insulation layer. A top size of the insulation layer in the first region is larger than a bottom size of the insulation layer in the first region. A maximum size of the first conductive structure in the second region is smaller than the bottom size of the insulation layer in the first region.