Fuse Box Guard Rings with Protruding Support Members
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Solution Overview
Problem
Moisture permeation through the insulating layer of semiconductor devices can reduce the reliability of integrated circuit devices by influencing the integrity of metal wiring, particularly in fuse-based circuit replacement systems.
Innovation Solution
The formation of fuse box guard rings with protruding support members around the fuse box, which are created using a high aspect ratio photo resist pattern in the conductive layer to provide lateral support and reduce deflection, thereby enhancing the accuracy of patterning and forming a moisture-resistant barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard photo resist pattern is used to form the fuse box guard ring, then the manufacturing process is simple, but the patterning accuracy is insufficient due to high aspect ratio causing deflection
Solution Approach 1:
The photo resist pattern is segmented into multiple components: a base layer forming the main guard ring structure and separate protruding support members that extend downward. This segmentation allows the support members to independently provide structural reinforcement without complicating the overall manufacturing process, as all components are formed in a single patterning step.
Solution Approach 2:
The solution transitions from a two-dimensional photo resist pattern to a three-dimensional structure by adding protruding support members that extend vertically downward from the base layer. This dimensional addition provides lateral support to counteract deflection in high aspect ratio regions without requiring multiple patterning steps.
2Reliability
If the fuse box guard ring is formed without protruding support members, then the manufacturing process is simpler, but moisture can permeate through the insulating layer affecting metal wiring integrity
Solution Approach 1:
The fuse box guard ring is formed as a thin conductive film structure with protruding support members that provide structural reinforcement. This thin film approach creates an effective moisture barrier while minimizing material usage and structural complexity, as the guard ring follows the contour of the fuse box opening without requiring thick or bulky constructions.
Solution Approach 2:
The protruding support members act as intermediary structural elements that connect the guard ring to the substrate, providing lateral support and preventing deflection. These support members mediate between the thin guard ring structure and the substrate, ensuring structural integrity without compromising the moisture barrier function.
3Manufacturing precision
If protruding support members are added to the fuse box guard ring, then lateral support and deflection reduction are achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The formation of the fuse box guard ring and the protruding support members is merged into a single patterning and etching process. The photo resist pattern is applied, exposed, and developed as one unified structure, and then a single etch step transfers both the guard ring and support members to the conductive layer simultaneously, eliminating the need for separate manufacturing steps.
Solution Approach 2:
The photo resist pattern serves multiple functions: it defines the guard ring geometry, determines the support member locations and shapes, and provides lateral support during processing. This multi-functional approach consolidates several roles into one element, simplifying the overall manufacturing process despite the added structural complexity.
Data Source
AI summary
A structure included in a semiconductor device can include a fuse box guard ring that defines an interior region of the fuse box inside the fuse box guard ring and that defines an exterior region of the fuse box outside the fuse box guard ring. The fuse box guard ring can include protruding support members that protruding from an interior sidewall or from an exterior sidewall of the fuse box guard ring.