Semiconductor Fuse Region Dummy Capacitor Step Height Control
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Solution Overview
Problem
The existing method for manufacturing semiconductor devices using a plate electrode as a fuse results in a thick fourth interlayer insulating film on the plate electrode, leading to difficulties in cutting the fuse effectively with a laser beam, causing defects due to the step height difference between the cell and fuse regions.
Innovation Solution
A method is introduced to form a dummy capacitor in the fuse region, allowing for the formation of an insulating film of desired thickness on the plate electrode, which involves forming a storage node and a dummy storage node region using lithographic processes and a full dip-out process to remove the insulating layers, enabling precise etching and reducing the thickness of the fourth interlayer insulating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a full dip-out process is used to remove the insulating layer for forming a cylindrical capacitor, then the storage node can be properly formed, but the fourth interlayer insulating film becomes excessively thick on the plate electrode in the fuse region
Solution Approach 1:
The fuse region is segmented from the cell region by forming a dummy storage node only in the cell region. This segmentation allows the fourth interlayer insulating film to be removed in the fuse region while remaining intact in the cell region, solving the thickness problem without affecting capacitor formation.
Solution Approach 2:
Different treatments are applied to different regions: the fourth interlayer insulating film is removed in the fuse region to enable laser cutting, while it is preserved in the cell region to maintain capacitor structure. This local differentiation resolves the contradiction between fuse manufacturability and capacitor integrity.
2Stability of the object's composition
If the fourth interlayer insulating film is thick on the plate electrode, then the capacitor structure is maintained, but the laser beam cannot effectively cut the fuse
Solution Approach 1:
The film removal is segmented to apply only to the fuse region, creating a localized thinning of the fourth interlayer insulating film. This allows laser cutting to proceed effectively in the fuse region while the capacitor structure in the cell region remains intact with full film thickness.
Solution Approach 2:
The fourth interlayer insulating film has different thickness characteristics in different regions: thin in the fuse region to enable laser cutting, and thick in the cell region to maintain capacitor stability. This local quality differentiation resolves the contradiction between ease of fuse manufacture and capacitor structure stability.
3Ease of manufacture
If the insulating film thickness is reduced in the fuse region, then laser cutting becomes effective, but the step height difference between cell and fuse regions increases
Solution Approach 1:
The dummy storage node structure segments the surface profile, creating a raised structure in the cell region that compensates for the removed film in the fuse region. This segmentation approach reduces the step height difference compared to complete film removal while still enabling effective laser cutting.
Solution Approach 2:
The fourth interlayer insulating film is selectively removed only in the fuse region while preserved in the cell region, creating a controlled local variation in film thickness. This local quality approach minimizes the overall step height difference by maintaining film presence in the adjacent cell region, thereby improving surface uniformity while enabling fuse cutting.
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 prevents fuse failures during the laser blowing process by maintaining the desired thickness of the insulating film on the plate electrode, ensuring accurate cutting and reducing defects in the semiconductor device.
Implementation Method 1
a laser beam is used to blow and cut a fuse
Implementation Method 2
removing the insulating layer by a lithographic-process
Data Source
AI summary
A semiconductor device manufacturing method including forming a dummy capacitor in a fuse region to avoid a step height between plate electrodes in a cell region and in a fuse region, is disclosed herein. The method can be used so that only an insulating film at a target thickness may remain on an upper part of the plate electrode in the fuse region during an etching process for forming a fuse open region, and a fuse failure due to laser blowing can be prevented.