Dummy Active Patterns for Uniform Semiconductor Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor devices are scaled down, the size reduction of MOS-FETs leads to deterioration in operational properties due to the short channel effect, necessitating a high-yield fabrication method that maintains uniformity and reliability.
Innovation Solution
A method involving a substrate with main and dummy regions, where dummy active patterns and gate electrodes are formed to create trench-defined active regions, with connection dummy active patterns connecting some of the dummy active patterns, allowing for uniform process conditions and improved reliability during semiconductor device fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MOS-FETs are scaled down to increase device density, then device integration is improved, but operational properties deteriorate due to short channel effect
Solution Approach 1:
The substrate is divided into first and second main regions with a dummy region positioned between them. The dummy region contains dummy active patterns and dummy gate electrodes that are segmented and spaced apart, creating distinct functional zones that maintain uniform process conditions across the entire substrate without interfering with the main device regions.
Solution Approach 2:
A dummy region acts as an intermediary between the first and second main regions. This dummy region contains dummy active patterns and dummy gate electrodes that serve as transition elements, maintaining uniformity of process conditions (such as etching, deposition, and planarization) across the substrate while preventing direct interaction between the main device regions.
2Manufacturing precision
If dummy regions are added to maintain uniformity, then process uniformity is improved, but device complexity increases
Solution Approach 1:
The dummy region is positioned locally between the first and second main regions, providing process uniformity only where needed. The dummy active patterns and dummy gate electrodes are configured with specific local characteristics (spaced apart, not continuously connected) that maintain uniformity without adding excessive complexity to the overall device structure.
Solution Approach 2:
The dummy region replicates the basic structure of active regions (with dummy active patterns and dummy gate electrodes) but in a simplified form. This copying approach maintains process uniformity by providing similar structural features throughout the substrate while using fewer materials and simpler configurations than full functional devices.
Data Source
AI summary
A method of fabricating a semiconductor device includes providing a substrate that includes first and second main regions and a dummy region, and forming dummy active patterns on the dummy region. The first and second main regions are spaced apart from each other in a first direction and the dummy region includes a dummy connection region between the first and second main regions and first and second dummy cell regions spaced apart from each other in a second direction. First dummy active patterns, second dummy active patterns, and connection dummy active patterns connecting some of the first dummy active patterns to some of the second dummy active patterns are provided on the first and second dummy cell regions and the dummy connection region, respectively.