Graphite Thermal Interface Film for Uniform Die Heat Spreading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing thermal interface materials (TIM) fail to efficiently spread and dissipate the heat generated by semiconductor dies, leading to excessive temperatures that reduce the reliability and operating lifetime of the semiconductor die.
Innovation Solution
A thermal interface film comprising layers of vertically and horizontally oriented graphite is used to improve thermal coupling and spread heat more uniformly across a larger surface area, enhancing thermal conductivity and reducing heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermal interface materials are used, then the structure is simple and easy to manufacture, but heat dissipation efficiency is insufficient leading to excessive temperatures
Solution Approach 1:
The patent employs a composite thermal interface material consisting of a polymer matrix reinforced with thermally conductive particles (such as aluminum oxide, boron nitride, or zinc oxide). This composite structure combines the ease of application and conformability of polymers with the high thermal conductivity of ceramic particles, thereby improving heat dissipation efficiency while maintaining manufacturing simplicity
Solution Approach 2:
The patent optimizes the thermal conductivity parameter of the interface material by adjusting the concentration, size, and distribution of thermally conductive particles within the polymer matrix. By changing these parameters, the material achieves enhanced heat transfer capability without significantly increasing structural complexity or manufacturing difficulty
2Temperature
If thermal interface material is applied, then thermal coupling is improved, but heat spreading uniformity across the surface is insufficient
Solution Approach 1:
The patent creates non-uniform local properties within the thermal interface material by strategically distributing thermally conductive particles with varying sizes and conductivities. This local quality variation enables the material to adapt to local heat generation patterns on the semiconductor die, improving overall heat spreading uniformity while maintaining good thermal contact
Solution Approach 2:
The polymer matrix acts as an intermediary between the semiconductor die and heat sink, providing both mechanical compliance for good contact and a vehicle for transporting thermally conductive particles. This intermediary structure enables effective heat transfer while accommodating surface irregularities, thereby improving both heat spreading uniformity and device reliability
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 thermal interface film effectively transfers heat away from the semiconductor die to the heat sink, improving thermal efficiency and extending the lifespan of the semiconductor die by ensuring uniform heat distribution.
Implementation Method 1
The thermal interface film effectively transfers heat away from the semiconductor die to the heat sink
Implementation Method 2
spread heat more uniformly across a larger surface area, enhancing thermal conductivity and reducing heat accumulation
Data Source
AI summary
A thermal interface film is used between a semiconductor die and a heat sink. The thermal interface film includes at least two layers, a first layer with vertically oriented graphite and a second layer with horizontally oriented graphite. The thermal interface film directs heat away from the semiconductor die both upwards and outwards, spreading the heat over a larger surface area more quickly.