Semiconductor Contact Window via Conductive Adhesive
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Solution Overview
Problem
Conventional semiconductor component arrangements require complex and costly processes to establish reliable electrical connections between chip-on-chip assemblies, as existing methods fail to maintain contact without oxidation interference and are inefficient in using anti-reflection layers during adhesive bonding.
Innovation Solution
A semiconductor component arrangement where a conductive protective layer, such as titanium nitride, is used to prevent surface oxidation, with the conductive adhesive forming connections via the extended etched edges of this layer rather than directly with the metal, allowing for longer contact windows and reduced process complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum or aluminum alloys are used for contact bonding, then manufacturing cost is reduced, but electrical connection reliability deteriorates due to rapid oxidation forming insulating oxide layers
Solution Approach 1:
The patent introduces a conductive adhesive as an intermediary substance between the aluminum contact area and the bonding surface. This adhesive mediator prevents direct exposure of aluminum to oxygen while enabling electrical conduction, thus resolving the contradiction between using inexpensive aluminum and maintaining reliable electrical connection.
Solution Approach 2:
The patent employs a conductive adhesive layer that serves as a sacrificial protective barrier. This adhesive layer is applied to protect the aluminum contact area from oxidation during assembly, accepting its role as a temporary protective element that ensures reliable electrical connection without requiring expensive noble metals.
2Ease of operation
If the anti-reflection layer is etched away to create contact windows, then wire bonding can be performed, but process complexity increases due to additional etching steps required to preserve the layer for adhesive bonding
Solution Approach 1:
The patent makes the anti-reflection layer multi-functional by preserving it during adhesive bonding contact window formation. The layer simultaneously serves its original anti-reflection function and provides a protective barrier against oxidation for the underlying metal, eliminating the need for additional etching steps that would be required to remove the layer completely.
Solution Approach 2:
The patent performs preliminary protective action by maintaining the anti-reflection layer intact during the adhesive bonding process. This preliminary preservation of the layer prevents subsequent oxidation of the metal contact area, avoiding the need for complex additional etching and re-deposition steps that would otherwise be required.
3Manufacturing precision
If conventional etching methods are used to open contact windows, then passivation layer can be removed, but selectivity is insufficient to preserve the underlying anti-reflection layer
Solution Approach 1:
The patent applies local quality by creating contact windows with specific geometric characteristics that enable adhesive bonding while preserving the anti-reflection layer. The contact window geometry is designed to allow conductive adhesive to reach the metal contact area through the passivation layer opening while the anti-reflection layer remains intact in areas where it provides protective function.
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 solution enables reliable electrical connections without additional etching or deposition steps, maintaining contact integrity and reducing process complexity while integrating with existing semiconductor technology.
Implementation Method 1
The conductive adhesive that contacts the protective layer there ensures the electrical connection of the protective layer. The current flow does not have to take place primarily via the unreliable contact between the conductive adhesive and the metal layer within a contact window provided for the adhesive contact due to the tendency to self-passivation, but via the electrical connection between the conductive adhesive, the etched edges of the protective layer and through them through to the metal layer.
Implementation Method 2
it would be desirable to leave the antireflection layer inside this contact window... these antireflection layers are very thin... cover the metal layer, which usually tends towards surface oxidation (i.e. self-passivation), with an electrically conductive protective layer, which is not subject to any or no surface self-passivation that has a disadvantageous effect on the electrical contactability
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The arrangement has semiconductor components (12, 14), and a contact window (32) that is formed in a passivation layer (26) and a protective layer (24) of the component (12). A metallic layer of the component (12) lies within the contact window, where the window is limited by side edges of the passivation and protective layers. An electrically conductive adhesive material (46) is arranged between an area of the metallic layer and a connection area of the component (14). The material is electrically connected with parts of edges of the protective layer.