Thermally Conductive Pillars for IC Heat Dissipation
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Solution Overview
Problem
As integrated circuits become more compact and operate at higher speeds, the demand for effective heat dissipation increases, as existing technologies struggle to efficiently manage the heat generated by these devices.
Innovation Solution
The formation of thermally conductive pillars made from materials with higher thermal conductivity than silicon, which penetrate through semiconductor substrates to conduct heat to a heat spreader or heat sink, enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integrated circuits are compacted into smaller areas to increase integration level, then device density and speed are improved, but heat dissipation becomes more difficult and demanding
Solution Approach 1:
The heat dissipation system is segmented into multiple independent thermally conductive pillars distributed across the semiconductor substrate. Each pillar acts as an independent heat conduction pathway, allowing heat to be dissipated through multiple parallel channels rather than a single path, thereby improving overall heat dissipation efficiency in compact devices
Solution Approach 2:
Thermally conductive pillars serve as intermediary structures between the integrated circuit devices and the heat spreader/heat sink. These pillars made of materials with higher thermal conductivity than silicon (such as diamond, cubic boron nitride, or carbon nanotubes) act as thermal mediators to efficiently transfer heat away from the compacted devices
2Speed
If driving currents are increased to improve integrated circuit speed, then circuit performance is improved, but heat generation increases and heat dissipation becomes more demanding
Solution Approach 1:
The patent converts the harmful effect of increased heat generation (resulting from higher driving currents needed for faster circuit speed) into a manageable challenge by introducing thermally conductive pillars. These pillars efficiently channel the excess heat away from the devices, allowing the system to operate at higher speeds without thermal damage
Solution Approach 2:
The thermal conductivity parameter of the substrate region is changed by introducing thermally conductive pillars with materials having significantly higher thermal conductivity than silicon. This parameter change enables efficient heat removal, allowing the system to sustain higher driving currents and achieve faster circuit speeds
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 use of thermally conductive pillars effectively transfers heat away from integrated circuits to a cooling medium and heat sink, improving heat dissipation and maintaining device performance.
Implementation Method 1
thermally conductive pillars made from materials with higher thermal conductivity than silicon, which penetrate through semiconductor substrates to conduct heat to a heat spreader or heat sink
Data Source
AI summary
A method includes forming a device die including forming integrated circuits on a semiconductor substrate; and forming a thermally conductive pillar extending into the semiconductor substrate. A cooling medium is attached over and contacting the semiconductor substrate to form a package, wherein the cooling medium is thermally coupled to the thermally conductive pillar.