Metal Oxide Adhesive Layer for IC Interconnect Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As integrated circuit features shrink, they become more prone to stresses like delamination and electromigration, leading to reliability issues due to reduced adhesion between dielectric and conductive layers, especially with high filler content dielectric materials.
Innovation Solution
Incorporating a metal oxide adhesive layer, such as aluminum oxide, chromium oxide, or nickel oxide, between the dielectric and conductive layers to enhance adhesion and address the challenges of electromigration and delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric materials with high filler content are used to improve thermal and electrical properties, then thermal stability and dielectric performance are improved, but adhesion to conductive material layers deteriorates
Solution Approach 1:
An adhesion layer comprising metal oxide is introduced between the high filler content dielectric material and the conductive material layer. This intermediary layer serves as a bridge that bonds to both materials, enabling the dielectric to maintain its high filler content for thermal stability while achieving adequate adhesion through the metal oxide interface.
Solution Approach 2:
The structure employs a composite approach by combining the high filler content dielectric material with a metal oxide adhesion layer. This composite structure allows each material to fulfill its specific function - the dielectric provides thermal and electrical performance while the metal oxide layer provides the necessary bonding interface.
2Productivity
If feature size is scaled down to increase density, then functional unit density is improved, but reliability deteriorates due to increased stresses and reduced adhesion
Solution Approach 1:
The metal oxide adhesion layer acts as an intermediary that becomes increasingly important as feature sizes shrink. At smaller dimensions, the relative impact of interface stresses increases, and the metal oxide layer provides a compliant bonding interface that accommodates these stresses while maintaining structural integrity.
3Ease of manufacture
If conventional adhesion methods are used with high filler dielectric materials, then manufacturing process is simple, but bonding strength is insufficient leading to delamination and electromigration
Solution Approach 1:
The metal oxide adhesion layer provides a simple yet effective intermediary solution that can be deposited using standard thin-film techniques. This layer dramatically improves bonding strength without complicating the overall manufacturing process, preventing delamination and electromigration issues.
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 metal oxide adhesive layer improves the bonding between dielectric and conductive layers, reducing the likelihood of delamination and electromigration, thereby enhancing the reliability and performance of integrated circuits.
Implementation Method 1
a metal oxide adhesive layer, wherein the metal oxide adhesive layer is between the dielectric layer and the conductive layer
Data Source
AI summary
Integrated circuit interconnect structures having a metal oxide adhesive layer between conductive interconnects and dielectric material, as well as related apparatuses and methods are disclosed herein. For example, in some embodiments, an integrated circuit interconnect structure may include a dielectric layer having 60% or more filler, a conductive layer, and a metal oxide adhesive layer between the dielectric and conductive layers. In some embodiments, the metal oxide adhesive layer may include one or more of aluminum oxide, chromium oxide, and nickel oxide.