Fuse Window Projections Prevent Sublimate Shorting
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Solution Overview
Problem
Conventional semiconductor devices with fuse elements often experience shorting due to sublimate adherence within fuse windows, even after the fuse element is blown, leading to electrical continuity between metal layers.
Innovation Solution
A semiconductor device with a fuse window design featuring projections on its sidewalls, where the projection's sidewall side width is narrower than its projecting side width, preventing sublimate adherence and maintaining current path interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse window is formed above the fuse element to enable laser blowing, then the fuse element can be blown successfully, but sublimate adheres to the sidewalls of the fuse window creating a leak path that causes shorting
Solution Approach 1:
The fuse window sidewalls are segmented into multiple surfaces through the formation of projections. These projections divide the continuous sidewall surface into distinct segments, preventing sublimate from forming a continuous conductive path across the entire sidewall, thereby eliminating the shorting issue while maintaining the fuse blowing function
Solution Approach 2:
The projections are strategically positioned at specific locations on the fuse window sidewalls where sublimate tends to adhere. By modifying the local geometry at these critical positions, the design prevents sublimate accumulation in key areas without affecting the overall fuse window structure or the laser blowing process
2Ease of operation
If the fuse window size is increased to accommodate a projection for laser positioning, then laser positioning is improved, but the fuse window area increases leading to more sublimate adherence
Solution Approach 1:
The projections on the fuse window sidewalls serve multiple functions simultaneously: they act as physical barriers to prevent sublimate adherence and create electrical isolation, while also serving as positioning references for laser alignment. This multi-functionality eliminates the need to increase fuse window area for separate positioning features
Solution Approach 2:
The design merges the sublimate prevention function and laser positioning function into a single structural feature (the projections). By combining these two functions into one element, the design avoids the need for additional structures that would increase the fuse window area and subsequent sublimate adherence problems
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
The design effectively suppresses shorting by ensuring sublimate does not adhere to the projections, maintaining electrical isolation between metal layers even after the fuse element is blown.
Implementation Method 1
sublimate generated when the fuse element is blown adheres as deposit to the inside of sidewalls of the fuse window
Data Source
AI summary
A semiconductor device including: a fuse element; and a fuse window that is formed above a region including the fuse element, that includes a pair of first sidewalls extending in a first direction running along a direction that current flows in the fuse element and a pair of second sidewalls extending in a second direction intersecting the first direction, and that is formed with a projection projecting out from a sidewall side toward the inside at an inner wall of at least one out of the first sidewalls or the second sidewalls, the projection having a sidewall side width that is narrower than a projecting side width.