Semiconductor Patterning Layout for Uniform Edge Density
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Solution Overview
Problem
The existing methods for manufacturing semiconductor devices face challenges in forming patterns with uniform density and arrangement on edge regions due to differences in pattern arrangement density, leading to defects and reduced bulk pattern formation efficiency.
Innovation Solution
A method involving the sequential stacking of mask layers on a substrate, with photoresist patterns formed to etch structures and spacers, followed by anisotropic etching and filling processes, to create mask patterns and bulk patterns with improved uniformity and reduced defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photoresist patterns are formed using conventional methods, then pattern formation is achieved, but pattern arrangement density uniformity deteriorates at edge regions
Solution Approach 1:
The substrate is divided into three distinct regions: a first region for high-density patterns, a second bulk region surrounding the first region, and a third region outside the second region. This segmentation allows different photoresist patterning strategies to be applied to different regions, ensuring uniform pattern arrangement density in the first region while maintaining effective bulk pattern formation in the second and third regions, thereby reducing defects at region boundaries.
Solution Approach 2:
Different photoresist patterning approaches are applied to different regions of the substrate. The first region receives patterns with a first arrangement density optimized for high precision, while the second and third regions receive bulk patterns with different characteristics. This local quality approach ensures that each region receives the appropriate pattern density for its function, improving overall manufacturing precision while reducing defects.
2Manufacturing precision
If multiple mask layers are stacked and processed, then pattern uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct stages corresponding to the three substrate regions. First photoresist patterns are formed on the third mask layer in the first and second regions, then a second photoresist pattern covers the third mask layer in the third region. Subsequent etching and spacer formation steps are region-specific, allowing pattern uniformity to be improved through controlled processing while managing complexity through systematic regional differentiation.
Solution Approach 2:
The solution adds a spatial dimension to the patterning process by dividing the substrate into three regions with different processing requirements. This dimensional approach allows simultaneous optimization of pattern uniformity in the first region and bulk pattern formation in the second and third regions, achieving high manufacturing precision without proportionally increasing overall process complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures uniform pattern formation on the first region and effective bulk pattern formation on the second and third regions, reducing defects and maintaining the size of the bulk region, thereby enhancing semiconductor device manufacturing efficiency.
Implementation Method 1
First photoresist patterns may be formed on the third mask layer in the first and second regions, and a second photoresist pattern may be formed to cover the third mask layer in the third region
Implementation Method 2
The third mask layer may be etched using the first and second photoresist patterns as etching masks to form first structures on the first and second regions and second structures on the third region
Implementation Method 3
The first spacer layer on the first region may be anisotropically etched to form first spacers on sidewalls of the first structures on the first region
Data Source
AI summary
A method for manufacturing a semiconductor device includes stacking an etch target layer and an etching mask layer on a substrate having first through third regions, forming first photoresist patterns on the etching mask layer in the first and second regions and a second photoresist pattern to completely cover the third mask layer in the third region, etching the etching mask layer using the first and second photoresist patterns as etching masks to form first mask patterns on the first and second regions and a second mask pattern on the third region, forming a filling pattern in a first opening between first mask patterns on the second region, etching the etch target layer using the first and second mask patterns and the filling pattern as etching masks to form first patterns including second openings on the first region and a bulk pattern covering second and third regions of the substrate.