Semiconductor Wiring Layout With Dummy Patterns for Uniform Etching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing side wall processing methods in semiconductor manufacturing face challenges such as microloading effects, dishing effects, and short circuits due to variations in pattern density and spatial frequency, leading to reduced yield and complexity in forming small-scale semiconductor devices.
Innovation Solution
The method involves forming sacrificial layers with specific patterns in functioning and dummy areas, using these layers as masks to etch concavities, and filling conductive or insulating materials, while ensuring the sacrificial layers in dummy areas are separated and form multiple components to minimize spatial frequency changes and reduce the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If side wall processing is used to form detailed patterns beyond lithography resolution limits, then manufacturing precision is improved, but device complexity increases due to multiple sacrificial layers and processing steps
Solution Approach 1:
The patent divides the processing area into multiple regions (first area with functioning wiring, second area with dummy wiring, third area without wiring) and applies different sacrificial layer configurations to each region. This segmentation allows the complex side wall processing to be managed region-by-region, reducing overall processing complexity while maintaining high precision in pattern formation.
Solution Approach 2:
The patent forms sacrificial layers in advance before the actual wiring formation process. By pre-positioning sacrificial layers in specific patterns and locations (including dummy areas), the subsequent etching and wiring formation steps become simpler and more controlled, reducing the complexity of the overall manufacturing process.
2Manufacturing precision
If sacrificial layers are used as masks for etching, then manufacturing precision is improved, but harmful factors increase due to microloading effects and dishing effects from pattern density variations
Solution Approach 1:
The patent applies different sacrificial layer configurations to different local regions: functioning areas receive sacrificial layers for precise wiring formation, while dummy areas receive separated sacrificial layer components. This local differentiation ensures that each region receives the appropriate processing quality, minimizing microloading and dishing effects caused by uniform high-density patterning across the entire substrate.
Solution Approach 2:
The patent converts the potential harm of high pattern density (which causes microloading and dishing effects) into a benefit by strategically placing dummy wirings with sacrificial layers in specific areas. These dummy structures serve to balance the overall pattern density distribution, transforming the harmful density variation into a controlled parameter that improves overall etching uniformity.
3Adaptability or versatility
If pattern density varies significantly across different positions, then adaptability is improved for different wiring configurations, but manufacturing precision deteriorates due to microloading effects
Solution Approach 1:
The patent systematically varies the pattern density parameter across different regions by controlling the distribution and configuration of sacrificial layers. In functioning areas, high density is maintained for precise wiring, while in dummy areas, density is adjusted through separated sacrificial layer components. This controlled parameter variation allows adaptation to different wiring configurations while maintaining etching uniformity across the entire substrate.
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 reduces the occurrence of microloading and dishing effects, enhances yield, and prevents short circuits by stabilizing pattern formation, allowing for smaller feature sizes beyond lithographic limits.
Implementation Method 1
forming a concavity by etching the insulation layer to be processed using the third sacrificial layer and the fourth sacrificial layer as a mask
Data Source
AI summary
A method for manufacturing a semiconductor device of one embodiment of the present invention includes: forming an insulation layer to be processed over a substrate; forming a first sacrificial layer in a first area over the substrate, the first sacrificial layer being patterned to form in the first area a functioning wiring connected to an element; forming a second sacrificial layer in a second area over the substrate, the second sacrificial layer being patterned to form in the second area a dummy wiring; forming a third sacrificial layer at a side wall of the first sacrificial layer and forming a fourth sacrificial layer at a side wall of the second sacrificial layer, the third sacrificial layer and the fourth sacrificial layer being separated; forming a concavity by etching the insulation layer to be processed using the third sacrificial layer and the fourth sacrificial layer as a mask; and filling a conductive material in the concavity.