Carbon Oxidation Barrier for Semiconductor Hybrid Bonding
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Solution Overview
Problem
In semiconductor devices, the exposed surfaces of electrically conductive bonding pads oxidize prior to bonding, forming a metal oxide interlayer that increases resistivity at the bonding interface, affecting the reliability and efficiency of metal-to-metal or hybrid bonding processes.
Innovation Solution
The formation of a carbon-containing oxidation barrier layer on the bonding pads reduces or eliminates the metal oxide interlayer by preventing surface oxidation, enhancing bonding strength and reducing interfacial resistance through the use of carbon-based materials like graphene or self-assembly materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding pads are exposed prior to bonding, then bonding process can be performed, but metal oxide interlayer forms that increases resistivity at the bonding interface
Solution Approach 1:
A carbon-containing material layer is introduced as an intermediary between the first bonding pad and the second bonding pad. This layer prevents direct oxidation of the metal bonding surfaces while enabling bonding to proceed, thereby maintaining low interfacial resistivity despite the exposed bonding process
Solution Approach 2:
The carbon-containing material creates a protective environment around the bonding pad surfaces, effectively establishing a localized inert atmosphere that prevents oxidation during the bonding process, thus avoiding the formation of high-resistivity metal oxide interlayers
2Reliability
If oxidation barrier layer is formed on bonding pads, then surface oxidation is prevented, but additional process steps are required
Solution Approach 1:
The carbon-containing material layer serves multiple functions simultaneously: it acts as an oxidation barrier during bonding, provides a template for low-resistivity interfacial region formation, and can be integrated with existing pad-level dielectric layers, thereby reducing the need for separate process steps
Solution Approach 2:
The formation of the carbon-containing material layer is combined with the pad-level dielectric layer formation process, merging the oxidation protection function with the existing bonding pad structure preparation, thus reducing overall process complexity
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 carbon-containing oxidation barrier layers improve the bonding strength and reduce the resistivity of the interface between bonding pads, leading to more reliable and efficient metal-to-metal or hybrid bonding processes.
Implementation Method 1
the exposed surfaces of electrically conductive bonding pads oxidize prior to bonding, forming a metal oxide interlayer... The formation of a carbon-containing oxidation barrier layer on the bonding pads reduces or eliminates the metal oxide interlayer by preventing surface oxidation
Implementation Method 2
enhancing bonding strength and reducing interfacial resistance through the use of carbon-based materials like graphene or self-assembly materials
Data Source
AI summary
At least one polymer material may be employed to facilitate bonding between the semiconductor dies. Plasma treatment, formation of a blended polymer, or formation of polymer hairs may be employed to enhance bonding. Alternatively, air gaps can be formed by subsequently removing the polymer material to reduce capacitive coupling between adjacent bonding pads.