Ultrathin Polymeric Interface Films for IC Adhesion Without Thermal Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuit devices with high aspect ratio surfaces face challenges in conformal deposition of adhesion promotion materials, leading to thermal resistance and reduced efficiency in high-speed input/output applications due to thick adhesive layers and surface roughening.
Innovation Solution
The use of vacuum-based vapor deposition techniques, such as initiated chemical vapor deposition (iCVD), to deposit thin film polymers as adhesion promotion layers on smooth or rough surfaces, providing strong covalent bonding and acting as stress buffer layers without adding heat transfer resistance, and enabling uniform conformal deposition on high aspect ratio features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick adhesive layers are used to promote adhesion, then adhesion strength is improved, but thermal resistance increases and heat transfer efficiency deteriorates
Solution Approach 1:
The patent applies this principle by using an ultrathin polymeric adhesive layer (few nanometers to sub-10 nm thickness) instead of thick adhesive layers. The thin film approach maintains adhesion promotion functionality while minimizing thermal resistance and heat transfer interference, directly resolving the contradiction between adhesion strength and thermal performance
Solution Approach 2:
The patent changes the thickness parameter of the adhesive layer from conventional thick layers to ultrathin dimensions (few nm to sub-10 nm). This parameter change enables the layer to provide sufficient adhesion promotion while becoming thermally transparent, thus resolving the trade-off between adhesion strength and thermal resistance
2Strength
If surface roughening is implemented to enhance adhesion, then adhesion promotion is improved, but device efficiency for high-speed input/output applications deteriorates
Solution Approach 1:
The patent uses an ultrathin polymeric film that can conform to both smooth and rough surfaces without requiring surface roughening. This thin film approach provides adhesion promotion while maintaining surface smoothness, thereby preserving device efficiency for high-speed applications
Solution Approach 2:
The polymeric adhesive layer acts as an intermediary between the substrate and overlying materials, providing adhesion promotion through its molecular structure and bonding capabilities rather than through surface roughening. This mediator approach enables adhesion enhancement without compromising surface quality or device efficiency
3Ease of manufacture
If conventional deposition techniques are used on high aspect ratio surfaces, then deposition capability is maintained, but conformal deposition quality deteriorates
Solution Approach 1:
The patent replaces conventional mechanical/physical deposition methods with a chemical vapor deposition process. The monomer vapor chemically reacts and polymerizes in situ on the substrate surface, enabling uniform conformal coating on high aspect ratio features where conventional techniques fail to achieve uniform coverage
4Strength
If additional curing steps are added to the deposition process, then adhesive performance is improved, but process complexity increases
Solution Approach 1:
The patent merges the deposition and curing steps into a single integrated process. The chemical vapor deposition process simultaneously deposits the polymeric adhesive layer and cures it through in situ polymerization, eliminating the need for separate curing steps while maintaining excellent adhesive performance and reducing 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
This approach ensures strong adhesion between materials, reduces delamination, and maintains high thermal and mechanical stability, while allowing for efficient deposition on complex surfaces without the need for additional curing steps, thus addressing thermal and efficiency issues in integrated circuit manufacturing.
Implementation Method 1
vacuum-based vapor deposition techniques, such as initiated chemical vapor deposition (iCVD), to deposit thin film polymers
Implementation Method 2
initiated chemical vapor deposition (iCVD)
Implementation Method 3
The polymers may function as an adhesive/adhesion promotion layer between the surface and the dielectric material. When used as an adhesion layer, the polymer materials may provide very strong covalent bonding at the interface between two materials
Data Source
AI summary
In one embodiment, an integrated circuit apparatus (e.g., package substrate) includes a polymeric layer between a metal and a dielectric or between a metal and a glass. The polymeric layer may be conformally deposited using a vacuum-based vapor deposition technique, e.g., initiated chemical vapor deposition (iCVD).