Flat Heat Pipe Integration for 3D IC Hotspot Cooling
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Solution Overview
Problem
Three-dimensional integrated circuits (3D ICs) face significant thermal management challenges due to high heat generation, leading to thermal hotspots that can cause device failure and performance degradation, with existing heat sinks and heat pipes being limited in efficiency and adaptability.
Innovation Solution
Employing rectangular-shaped and disk-shaped heat pipes as both heat sinks and heat spreaders in 3D IC structures to enhance thermal performance, utilizing finite volume numerical analysis to optimize heat transfer and reduce hotspot temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heat pipes are used in 3D ICs, then heat transfer is achieved, but the heat pipes are limited by directional heat transfer and shape, making it difficult to efficiently manage heat in compact designs
Solution Approach 1:
The patent transitions from traditional cylindrical heat pipes to flat heat pipes with rectangular or triangular cross-sections. This dimensional change allows the heat pipe to conform to the planar geometry of 3D IC stacks and provides multi-directional heat spreading capability, effectively reducing hotspot temperatures while simplifying thermal management in compact designs
Solution Approach 2:
The patent employs heat pipes with asymmetric cross-sectional geometries (rectangular or triangular) rather than symmetric cylindrical shapes. This asymmetry enables the heat pipe to efficiently spread heat in multiple directions across the 3D IC stack, with the flat geometry providing better contact area and thermal coupling to the stacked dies and TSV structures
2Productivity
If 3D ICs pack extraordinary amount of complexity into extremely small space, then functional density and performance are improved, but substantial heat is generated resulting in device reliability damage
Solution Approach 1:
The flat heat pipe is strategically positioned to provide localized thermal management at the hotspot regions of the 3D IC stack. The heat pipe's flat geometry allows it to conform to and treat specific high-heat-generation areas while maintaining effectiveness in the compact 3D configuration, thereby protecting device reliability without compromising functional density
3Temperature
If rectangular-shaped or disk-shaped heat pipes are used as heat sinks and spreaders, then hotspot temperatures are reduced by 7-16 K and junction temperatures by 14-16 K, but the structure requires optimization through numerical analysis
Solution Approach 1:
The patent performs finite volume numerical analysis during the design phase to optimize the geometry and configuration of the flat heat pipe before manufacturing. This preliminary optimization ensures that the heat pipe achieves maximum thermal performance (reducing junction temperatures by 14-16 K) while being prepared for straightforward manufacturing and integration into the 3D IC assembly process
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 implementation of flat-shaped heat pipes significantly reduces hotspot temperatures by 7-16 K, improves thermal conductivity, and reduces the overall weight of the 3D IC structure, while maintaining or enhancing heat dissipation capabilities.
Implementation Method 1
a heat spreader located above the plurality of die, the device layer and the thermal interface material, the heat spreader comprising a heat pipe
Implementation Method 2
Heat pipes can be excellent heat sinks and have been contributing to the thermal management in existing integrated circuit technology. A heat pipe is a vacuum sealed metal tube that contains a working fluid that changes from liquid to vapor when heat is applied to one end of the tube
Implementation Method 3
a thermal interface material formed above the substrate
Data Source
AI summary
A three-dimensional integrated circuit device can include a group of die, a device layer and a thermal interface material formed above the substrate. A heat spreader can be located above the die, the device layer and the thermal interface material. The heat spreader can include a heat pipe comprising a rectangular-shaped heat pipe or disk-shaped heat pipe. A heat sink can be located above the heat spreader. The heat sink can include the heat pipe comprising the rectangular-shaped heat pipe or the disk-shaped heat pipe.