Via Definition Scheme Single Mask Integration
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Solution Overview
Problem
Current integrated circuit fabrication processes require two separate masks and exposure processes to define metal lines and vias, making them inefficient and costly.
Innovation Solution
A via definition scheme that uses a single photolithography exposure of a metal pattern layer and a spacer layer to form a metal trench and via hole, reducing the need for multiple masks and exposures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two separate masks and exposure processes are used to define metal lines and vias, then the definition precision of metal lines and vias is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the definition of metal lines and vias into a single exposure process by using a metal pattern layer with variable width features. The wider portions of the metal pattern define via locations while narrower portions define metal line regions, allowing both features to be defined simultaneously in one exposure step rather than requiring separate masks.
Solution Approach 2:
The metal pattern layer serves multiple functions: it defines both metal line regions and via locations, acts as an etch mask for forming both metal trenches and via holes, and eliminates the need for separate via definition masks. This multi-functionality reduces process complexity while maintaining definition precision.
2Manufacturing precision
If two separate masks and exposure processes are used to define metal lines and vias, then the definition precision of metal lines and vias is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the definition of metal lines and vias into a single exposure process by using a metal pattern layer with variable width features. The wider portions of the metal pattern define via locations while narrower portions define metal line regions, allowing both features to be defined simultaneously in one exposure step rather than requiring separate masks.
Solution Approach 2:
The metal pattern layer serves multiple functions: it defines both metal line regions and via locations, acts as an etch mask for forming both metal trenches and via holes, and eliminates the need for separate via definition masks. This multi-functionality reduces process complexity while maintaining definition precision.
3Manufacturing precision
If two separate masks and exposure processes are used to define metal lines and vias, then the definition precision of metal lines and vias is improved, but the productivity decreases
Solution Approach 1:
The patent combines the definition of metal lines and vias into a single exposure process by using a metal pattern layer with variable width features. The wider portions of the metal pattern define via locations while narrower portions define metal line regions, allowing both features to be defined simultaneously in one exposure step rather than requiring separate masks.
Solution Approach 2:
The metal pattern layer serves multiple functions: it defines both metal line regions and via locations, acts as an etch mask for forming both metal trenches and via holes, and eliminates the need for separate via definition masks. This multi-functionality reduces process complexity while maintaining definition precision.
Data Source
AI summary
A method includes defining a metal pattern layer over a first dielectric layer. The first dielectric layer is disposed over an etch stop layer and the etch stop layer is disposed over a second dielectric layer. A spacer layer is grown over the metal pattern layer and the first dielectric layer. A metal trench is formed with a metal width in the first dielectric layer. A via hole is formed with a via width in the second dielectric layer.