Meandering Isolation Layer for Semiconductor Integration
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Solution Overview
Problem
Current semiconductor devices face challenges in achieving high integration and enhanced electrical characteristics, particularly in field effect transistors, due to limitations in device isolation layers and transistor design, which affect their reliability and performance.
Innovation Solution
The semiconductor device incorporates a substrate with active patterns and multiple device isolation layers, including a third device isolation layer with a meandering shape that separates PMOSFET and NMOSFET regions, enhancing electrical characteristics and integration by optimizing the layout and depth of isolation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional device isolation layers are used, then manufacturing is simpler, but integration density and electrical performance deteriorate
Solution Approach 1:
The device isolation layer is divided into multiple segments: a first device isolation layer with a first depth, a second device isolation layer with a second depth greater than the first depth, and a third device isolation layer with a third depth greater than the second depth. Each segment serves specific regions, allowing high integration density through selective deep isolation while maintaining manufacturing feasibility through staged formation processes.
Solution Approach 2:
Different depth levels of device isolation layers are applied to different regions: the third device isolation layer is positioned in a third region, the second in a second region, and the first in a first region. This local differentiation optimizes electrical performance in specific areas without unnecessarily complicating the entire device structure, resolving the contradiction between precision and complexity.
2Reliability
If device isolation layers are made deeper, then electrical characteristics improve, but manufacturing complexity increases
Solution Approach 1:
The isolation structure is segmented into three depth levels, with each layer formed to a specific depth appropriate for its functional region. This segmentation achieves the required electrical characteristics through selective deep isolation where needed, rather than uniformly increasing depth across the entire device, thereby managing manufacturing complexity.
Solution Approach 2:
The patent introduces a vertical dimensionality aspect by forming device isolation layers at three distinct depth levels (first depth < second depth < third depth). This multi-level vertical arrangement enhances electrical characteristics by providing better isolation at critical interfaces while maintaining a manageable overall structure through the systematic organization of depth levels.
3Productivity
If active patterns are extended across PMOSFET and NMOSFET regions, then integration is enhanced, but electrical interference increases
Solution Approach 1:
The third device isolation layer is specifically positioned in the third region to provide enhanced electrical isolation where PMOSFET and NMOSFET regions intersect with extended active patterns. This local isolation prevents electrical interference between opposite-polarity transistors while allowing the active patterns to extend continuously across regions for high integration, resolving the contradiction between productivity and harmful factors.
Solution Approach 2:
The device isolation layers, particularly the third layer in the third region, act as intermediary structures between PMOSFET and NMOSFET regions. These isolation layers provide electrical separation to prevent harmful interference while allowing the active patterns to maintain continuity for high integration, effectively mediating between the conflicting requirements.
Data Source
AI summary
A semiconductor device includes a substrate that includes active patterns extending in a second direction, a third device isolation layer disposed on an upper portion of the substrate that includes a PMOSFET region and an NMOSFET region, and a gate electrode that extends across the active patterns in a first direction that crosses the second direction. The active patterns extend across the PMOSFET region and the NMOSFET region. The third device isolation layer lies between the PMOSFET region and the NMOSFET region. The third device isolation layer comprises a first part that extends in the second direction and a second part that extends in a third direction that crosses the first and second directions. The second part has opposite sidewalls parallel to the third direction, in a plan view.