Necked Fuse Line Spacer Configuration for Semiconductor Integrity
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Solution Overview
Problem
Semiconductor devices face integrity issues due to shorts around the weak link of fuse lines when they are blown, compromising the overall reliability of the device.
Innovation Solution
Incorporating wider spacers next to the fuse lines and wider plugs in the vicinity of the necked fuse segment to prevent potential shorts, with the fuse line featuring a nominal segment and a necked segment of smaller width, ensuring the integrity of the device remains intact when the fuse is blown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a weak link is included in the fuse line to expedite fuse programming, then the fuse programming speed is improved, but shorts may occur around the weak link when the fuse is blown, compromising device integrity
Solution Approach 1:
A dielectric spacer is introduced as an intermediary element positioned between the weak link fuse segment and adjacent interconnect lines. This spacer acts as a protective barrier that prevents harmful electrical shorts while allowing the weak link to function properly for expedited fuse programming
Solution Approach 2:
The dielectric spacer is pre-positioned around the weak link fuse segment before the fuse can blow. This preliminary protective structure prevents the potential harmful effect (short circuit) from occurring in the first place, maintaining device integrity even when the fuse opens
2Ease of manufacture
If the fuse line is made with uniform width, then the manufacturing process is simpler, but the fuse may not blow reliably and may create shorts around the fuse line
Solution Approach 1:
The fuse line is designed with non-uniform width, featuring a constricted or necked region at the desired fuse location. This local variation in geometry creates a weak link that will preferentially fail under overcurrent conditions, ensuring reliable fuse operation while the rest of the interconnect maintains adequate width for current carrying capacity
Data Source
AI summary
Embodiments herein describe techniques for fuse lines and plugs formation. A semiconductor device may include a fuse line having a nominal fuse segment abutted to a necked fuse segment. The nominal fuse segment may be wider than the necked fuse segment. A first spacer may be along a first side of the fuse line and a second spacer along a second side opposite to the first side of the fuse line. The first spacer may include a part having a width at least twice a width of a part of the second spacer. A plug within a vicinity of the necked fuse segment may have a plug width that may be at least twice a plug with of a plug of an interconnect line outside the vicinity. Other embodiments may also be described and claimed.