Bond Pad Anti-Reflective Coating Segmentation for Corrosion Control
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Solution Overview
Problem
Conventional integrated circuits experience corrosion of the anti-reflective coating layer due to exposure in high-humidity or water-based environments, leading to oxidation and increased pressure on the passivation layer, which can cause cracks and render the circuits inoperable.
Innovation Solution
The anti-reflective coating layer and metal layer are divided into multiple portions, with the oxidation confined to a specific area around the bond pad opening, reducing the likelihood of oxidation propagation and subsequent pressure on the passivation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anti-reflective coating layer is exposed in high-humidity or water-based environments, then the bond pad can receive electrical connections, but the anti-reflective coating layer undergoes oxidation and corrosion
Solution Approach 1:
The anti-reflective coating layer is divided into multiple portions with at least one opening formed through it, creating separate regions that isolate the oxidation process to specific areas around the bond pad while preserving the overall protective function of the coating
Solution Approach 2:
The opening is positioned specifically around the bond pad area where electrical connection is needed, allowing local exposure for connection while the rest of the anti-reflective coating remains intact to prevent oxidation in other regions
2Ease of operation
If the anti-reflective coating layer undergoes oxidation, then electrical connection is enabled, but oxidation propagates and increases pressure on the passivation layer causing cracks
Solution Approach 1:
By segmenting the anti-reflective coating layer into multiple portions with openings, the oxidation process is confined to specific localized areas around the bond pad rather than propagating across the entire coating layer, preventing cumulative pressure buildup that would crack the passivation layer
Solution Approach 2:
The segmented structure with openings is designed in advance to preemptively control and limit oxidation to specific regions, preventing the harmful propagation of oxidation before it can generate sufficient pressure to damage the passivation layer
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 configuration limits oxidation to a narrow area, reducing the risk of passivation layer failure and maintaining the integrity of the integrated circuit.
Implementation Method 1
A bond pad is typically formed by etching through one or more layers of material to reveal an underlying metal layer. The layers that are etched often include a passivation layer and an anti-reflective coating (ARC) layer. Conventional integrated circuits experience corrosion of the anti-reflective coating layer due to exposure in high-humidity or water-based environments, leading to oxidation
Data Source
AI summary
A bond pad structure has a first conductive layer and an anti-reflective coating layer disposed on the first conductive layer. The first conductive layer includes first and second portions (which could be formed by etching). Part of the first portion is exposed within a bond pad opening, and the second portion is electrically connected to an integrated circuit. The anti-reflective coating layer also includes first and second portions (which could be formed by etching). The first portion may be located near the bond pad opening, and the second portion may be located farther away from the bond pad opening. A second conductive layer electrically connects the first and second portions of the first conductive layer. In this way, the first portion of the anti-reflective coating layer may undergo oxidation without leading to oxidation of the second portion of the anti-reflective coating layer.