Patterned Mask Layer Spacing via Spacer-Defined Strip Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As feature sizes in semiconductor devices continue to decrease, the complexity of fabrication processes increases, making it challenging to form reliable semiconductor devices.
Innovation Solution
The process involves forming strip structures over a mask layer, depositing a spacer layer, and then forming additional strip structures between the spacer layer and the original strip structures, allowing for adjustable distances between conductive lines without the need for additional patterning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feature sizes continue to decrease to increase functional density, then production efficiency and cost are improved, but fabrication process complexity and difficulty increase
Solution Approach 1:
The fabrication process is divided into distinct stages: forming mandrels, depositing spacer layers, and selectively removing portions. This segmentation allows each step to be optimized independently, managing the complexity of manufacturing at smaller feature sizes while maintaining productivity benefits from scaling.
Solution Approach 2:
Mandrels are formed in advance as sacrificial structures that define the positions of subsequent features. This preliminary action enables precise placement of conductive lines and other features at reduced dimensions without requiring complex real-time alignment processes, thus managing fabrication complexity while maintaining high functional density.
2Manufacturing precision
If additional patterning processes are used to control distance between conductive lines, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
A spacer layer is deposited as an intermediary material between mandrels to define the distance between conductive lines. The spacer layer's thickness, controlled by deposition parameters, directly determines the spacing precision without requiring additional patterning steps. This eliminates complex multi-step patterning processes while maintaining high manufacturing precision for line distances.
Solution Approach 2:
The spacer layer automatically forms uniform thickness across the substrate through conformal deposition, self-defining the distance between adjacent conductive lines. This self-service mechanism eliminates the need for additional lithography and etching steps that would otherwise be required to precisely control spacing, reducing device complexity while maintaining precision.
3Manufacturing precision
If more patterning steps are added to form precise patterns, then manufacturing precision is improved, but loss of time and productivity decrease
Solution Approach 1:
The formation of mandrels, spacing definition, and feature patterning are merged into an integrated process sequence where the spacer layer simultaneously serves as both a spacing definition and a patterning element. This consolidation achieves precise pattern formation without requiring separate patterning steps, thereby reducing total fabrication time while maintaining high manufacturing precision.
Solution Approach 2:
The spacer layer is deposited in advance to pre-define all spacing relationships between features before final patterning steps. This preliminary action establishes the geometric framework for the entire device, allowing subsequent steps to proceed more quickly without compromising pattern precision, thus reducing overall fabrication time.
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 complexity and cost of the fabrication process by eliminating the need for additional patterning steps, while allowing for precise control over the distance between conductive lines.
Implementation Method 1
depositing a spacer layer
Data Source
AI summary
A method for forming a patterned mask layer is provided. The method includes forming a layer over a substrate. The method includes forming a first strip structure and a second strip structure over the layer. The method includes forming a spacer layer over the first strip structure, the second strip structure, and the layer. The method includes forming a third strip structure and a fourth strip structure between the first strip part and the second strip part. The connecting part is between the third strip structure and the fourth strip structure. The method includes removing the spacer layer. The first strip structure, the second strip structure, the third strip structure, and the fourth strip structure together form a patterned mask layer.