Dual-Layer Diamond Thermal Substrate for IC Heat Dissipation
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Solution Overview
Problem
Thermal management in integrated circuits (ICs) is challenging due to excessive heat generation, which can cause physical damage, degradation, and reduced operational reliability, particularly in high-performance devices like CPUs and GPUs, where materials expand and contract, leading to fatigue and electromigration.
Innovation Solution
A dual-layer diamond structure is implemented, comprising a carbon-12 enriched heat spreader layer directly beneath heat-generating regions and a non-enriched isotopic diamond thermal sink layer, both grown monolithically or bonded, to efficiently dissipate heat and maintain operational temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single-layer diamond substrate is used for heat dissipation, then the device structure is simple, but the thermal management efficiency is insufficient for high-power applications
Solution Approach 1:
The diamond substrate is segmented into two distinct layers: a first diamond layer with high thermal conductivity for efficient heat dissipation, and a second diamond layer with lower thermal conductivity for thermal isolation. This segmentation allows each layer to perform its specific thermal function optimally, resolving the contradiction between heat dissipation efficiency and structural simplicity.
Solution Approach 2:
The invention uses a composite structure combining two different diamond materials with distinct thermal properties. The first diamond layer (high thermal conductivity) and second diamond layer (low thermal conductivity) are bonded together to form a composite substrate that simultaneously achieves superior heat dissipation and thermal isolation, eliminating the need for complex multi-material assemblies.
2Temperature
If high thermal conductivity diamond is used throughout the substrate, then heat dissipation is improved, but thermal isolation between devices is reduced
Solution Approach 1:
Different regions of the diamond substrate are assigned different thermal conductivity properties: the first diamond layer beneath heat-generating devices has high thermal conductivity for efficient heat removal, while the second diamond layer provides lower thermal conductivity for thermal isolation between adjacent devices. This local differentiation of thermal properties resolves the contradiction between heat dissipation and thermal isolation.
3Temperature
If diamond substrate thickness is increased to improve heat sinking, then thermal management is enhanced, but device footprint and integration density are reduced
Solution Approach 1:
The diamond substrate is divided into two functional layers with optimized thicknesses: a thin first diamond layer (1-10 micrometers) for efficient heat dissipation close to the heat-generating devices, and a thicker second diamond layer for thermal isolation and mechanical support. This segmented approach achieves effective thermal management with reduced overall substrate thickness and footprint.
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 diamond structure enhances heat management, improving device performance and lifespan by efficiently distributing and dissipating heat, allowing for higher energy densities and reduced device footprint in high-power and high-frequency applications.
Implementation Method 1
an ultra-high thermal conductivity heat spreader composed of isotopically pure Carbon-12 (C12) diamond directly beneath the heat-generating regions of the chip
Implementation Method 2
a diamond thermal sink layer positioned beneath the heat spreader. The thermal sink layer contains diamond with a non-enriched isotopic composition
Implementation Method 3
The heat spreader and thermal sink may be deposited in a continuous chemical vapor deposition process, switching gases without stopping deposition
Data Source
AI summary
A diamond thermal structure includes a diamond heat spreader layer that has been enriched in carbon-12 isotope, and a diamond thermal sink layer positioned beneath the heat spreader. The thermal sink layer contains diamond with a non-enriched isotopic composition.