Self-Healing Thermal Interface Materials for IC Reliability
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Solution Overview
Problem
Polymeric thermal interface materials in integrated circuit devices fail due to thermo-mechanical stresses, leading to delamination and increased thermal resistance, which can damage circuits due to inadequate heat dissipation.
Innovation Solution
A self-healing thermal interface material comprising a polymer and a self-healing constituent, such as sulfur-based disulfides or tetrasulfides, that forms chemical bonds to maintain contact and prevent failure modes under temperature cycles, using microcapsules to encapsulate the self-healing agent for crack repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric thermal interface materials are used to fill the gap between integrated circuit devices and heat dissipation devices, then thermal contact is initially established, but the materials fail under thermo-mechanical stresses leading to delamination and increased thermal resistance
Solution Approach 1:
The patent modifies the chemical composition and molecular structure of the polymeric thermal interface material by incorporating specific additives and cross-linking agents. These parameter changes enable the material to dynamically adjust its physical properties (viscosity, elasticity, adhesion) in response to temperature and stress conditions, preventing failure modes like delamination and pump-out while maintaining thermal contact stability throughout the service life
Solution Approach 2:
The patent creates a composite thermal interface material by combining polymer base materials with functional additives including adhesion promoters, cross-linking agents, and fillers. This composite structure synergistically combines the thermal conductivity of the polymer matrix with the adhesive properties of additives, resulting in a material that resists delamination, voiding, and pump-out under thermo-mechanical cycling while maintaining effective thermal contact
2Reliability
If the thermal interface material is compressed to improve thermal contact, then thermal resistance decreases initially, but compression leads to pump-out where material physically moves out from between the device and heat dissipation device
Solution Approach 1:
The patent adjusts the viscoelastic parameters of the thermal interface material through compositional modification and cross-linking. These parameter changes enable the material to maintain optimal compression resistance - remaining sufficiently soft to conform to surface irregularities and fill gaps for good thermal contact, while developing sufficient elastic recovery to resist pump-out and material displacement under sustained compressive loads during thermal cycling
3Stability of the object's composition
If the thermal interface material is made harder to resist deformation, then structural stability improves, but adhesion is lost leading to delamination from the heat dissipation device
Solution Approach 1:
The patent implements dynamic parameter changes by incorporating cross-linking agents and adhesion promoters that allow the material to adjust its hardness and adhesion properties in response to environmental conditions. The material maintains softer, more adhesive characteristics at operating temperatures to prevent delamination, while providing sufficient structural stability to resist deformation and maintain thermal contact geometry throughout the service life
Solution Approach 2:
The patent creates a composite material system where polymer matrices are combined with adhesion-promoting additives and cross-linking agents. This composite structure provides a dual-function material that simultaneously delivers structural stability to resist deformation and strong adhesion to prevent delamination from the heat dissipation device and integrated circuit substrates during thermal cycling
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 self-healing thermal interface material effectively maintains thermal contact and prevents delamination, enhancing heat dissipation and reducing thermal resistance, thereby protecting integrated circuit devices from damage.
Implementation Method 1
a self-healing constituent, such as sulfur-based disulfides or tetrasulfides, that forms chemical bonds to maintain contact and prevent failure modes under temperature cycles
Implementation Method 2
A thermal interface material is disposed between the integrated circuit device(s) and the heat dissipation device to form thermal contact therebetween
Data Source
AI summary
A thermal interface material may be formed comprising a polymer material and a self-healing constituent. The thermal interface material may be used in an integrated circuit assembly between at least one integrated and a heat dissipation device, wherein the self-healing constituent changes the physical properties of the thermal interface material in response to thermo-mechanical stresses to prevent failure modes from occurring during the operation of the integrated circuit assembly.