Bond Pad Structure with Conductor-Insulator Composite Layer
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Solution Overview
Problem
Conventional bond pad structures in semiconductor devices face issues with corrosion and damage during probing and packaging due to exposure of conductive layers, leading to reduced bonding strength and reliability.
Innovation Solution
A bond pad structure featuring a conductive-insulator composite layer with a composite region and a single material region, where the insulator is harder than the conductor, is used to protect the conductive layer from damage and provide effective contrast for probing and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is added to protect the conductive layer from corrosion, then corrosion resistance is improved, but device complexity increases
Solution Approach 1:
The patent applies composite materials by creating a conductor-insulator composite layer where conductive regions and insulative regions are integrated within a single layer. This composite structure provides both electrical conductivity where needed and mechanical protection where required, eliminating the need for separate metal protection layers while maintaining corrosion resistance through the integrated design.
Solution Approach 2:
The conductor-insulator composite layer serves multiple functions simultaneously: it provides electrical connection through conductive regions, mechanical protection through insulative regions, and structural integrity for probing. This multi-functional layer replaces what would traditionally require multiple separate layers, reducing overall device complexity while maintaining protective functions.
2Ease of operation
If the probe penetrates the metal layer to contact the conductive layer, then electrical connection is achieved, but the metal layer may peel off reducing bonding strength
Solution Approach 1:
The patent applies local quality by creating specific insulative regions positioned at the periphery of the conductor-insulator composite layer, while maintaining conductive regions in the center. The insulative regions are strategically placed to provide mechanical support and prevent peeling during probing, while the conductive regions maintain electrical connectivity. This localized differentiation of material properties solves both probing access and bonding strength requirements.
3Productivity
If multiple openings are formed in the passivation layer for repeated testing, then functionality testing is improved, but the exposed conductive layer corrodes reducing reliability
Solution Approach 1:
The patent applies preliminary action by pre-forming the conductor-insulator composite layer with integrated insulative regions during the fabrication process, before any probing or testing occurs. This pre-established protective structure prevents corrosion from the beginning, eliminating the need for repeated opening formation in passivation layers. The insulative regions are already in place to protect exposed areas during subsequent testing operations.
4Strength
If the insulator is made harder than the conductor to protect during probing, then damage resistance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by utilizing the inherent hardness differences between conventional conductor materials (softer) and insulator materials (harder) without requiring extreme precision in material deposition. The insulative regions are formed with standard manufacturing tolerances, and their protective function arises naturally from the material property difference rather than requiring ultra-precise positioning or thickness control. This approach reduces manufacturing precision requirements while maintaining damage resistance.
Data Source
AI summary
Bond pad structures are presented. Some embodiments of the structure include a conductive conductor-insulator layer overlying a substrate. The conductive conductor-insulator layer includes a composite region having a conductor sub-region and insulator sub-region, which neighbor each other, and a single material region. The insulator is harder than the conductor.