Semiconductor Periphery Dummy Pattern Layout Against Collapse
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Solution Overview
Problem
As integrated circuits are scaled down, dummy active areas in the periphery of semiconductor structures are prone to defects, bending, or collapse due to their small size, leading to electrical or structural issues and potential short circuits between adjacent bit lines, necessitating an improved design to enhance reliability and process window.
Innovation Solution
The semiconductor structure incorporates dummy patterns with L-shaped or stripe designs in the periphery region, where the second portion extends in a different direction than the target layer patterns, and has a greater width than the target patterns, connecting to them to prevent collapse and reduce environmental variations, thereby avoiding defects and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If dummy active areas are made small to fit the periphery region, then the area utilization is improved, but the structural stability deteriorates causing collapse or bending
Solution Approach 1:
The dummy pattern is designed with portions extending in different directions (first portion and second portion with different extending directions), transforming a simple small-area placeholder into a multi-directional structural element that provides stability without occupying excessive area. This dimensional approach allows the dummy pattern to resist collapse and bending while maintaining compact footprint.
Solution Approach 2:
The dummy pattern employs asymmetric design where the first portion and second portion extend in different directions, creating an L-shaped or T-shaped configuration. This asymmetric structure provides enhanced structural stability compared to symmetric small patterns, preventing collapse and bending while efficiently utilizing the periphery region area.
2Stability of the object's composition
If dummy active areas are connected to prevent collapse, then the structural stability is improved, but the risk of short circuits between adjacent bit lines increases
Solution Approach 1:
The dummy pattern is segmented into multiple portions (first portion and second portion) that extend in different directions, with selective connection to target layer patterns. This segmentation provides structural stability through distributed support rather than continuous connection, reducing the risk of creating conductive paths that could cause short circuits between adjacent bit lines.
Solution Approach 2:
The dummy pattern applies different properties to different portions: the first portion may connect to target layer patterns for structural support, while the second portion extends in a different direction with potentially different connection characteristics. This local differentiation provides stability where needed while minimizing short circuit risk in other areas.
3Ease of manufacture
If the same pattern is used in periphery as in central region, then the manufacturing simplicity is improved, but the process window decreases due to edge effects
Solution Approach 1:
The patent applies different pattern designs to different regions: the central region uses standard target layer patterns, while the periphery region uses specially designed dummy patterns with portions extending in different directions. This local differentiation compensates for edge effects and processing variations in the periphery, expanding the process window without significantly complicating manufacturing.
Solution Approach 2:
The dummy patterns are designed in advance with specific geometric configurations (L-shaped, T-shaped, or other multi-directional forms) that pre-compensate for expected edge effects and processing variations. This preliminary structural design ensures that the periphery region maintains reliability comparable to the central region under normal processing conditions.
Data Source
AI summary
A semiconductor structure includes a central region and a periphery region. The periphery region surrounds the central region. The semiconductor structure includes a target layer pattern formed in the central region, and a dummy pattern formed in the periphery region, and the target layer pattern and the dummy pattern are formed by the target layer. The dummy pattern includes a first portion and a second portion. The extending direction of the second portion is different from the extending direction of each of the target layer patterns, and the first portion and the second portion extend in different directions. The second portion of one of the dummy patterns is connected to one of the target layer patterns or the first portion.