Integrated Gate Cooling via Nano-Fluidic Channels
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Solution Overview
Problem
Current cooling solutions for semiconductor devices are inefficient and wasteful due to their distance from heat sources, leading to thermal waste and performance degradation, especially in high-density 3D integration environments like data centers, where 40% of energy is used for cooling and heat management becomes a significant challenge.
Innovation Solution
The implementation of nano-fluidic channels directly proximate to CMOS transistors for dielectric liquid immersion, allowing for quasi-instant heat removal through a closed circuit within the chip and secondary cooling at the package level, significantly reducing thermal constraints and enhancing power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional cooling solutions (heatsinks, fans) are used at package or circuit board level, then cooling coverage is provided, but the distance from heat sources (transistors) is too great, resulting in inefficient heat removal and thermal waste
Solution Approach 1:
The patent transitions from conventional 2D planar cooling (heatsinks at package level) to 3D integrated cooling by embedding fluidic channels within the substrate itself. This vertical integration places cooling channels in direct proximity to heat-generating transistors, eliminating the horizontal distance gap and enabling efficient heat extraction at the source.
Solution Approach 2:
The cooling channels are nested within the substrate structure, with fluidic passages embedded inside the substrate material. This nested configuration allows the cooling system to occupy the same spatial envelope as the transistor array, achieving intimate thermal coupling without adding external cooling bulk.
2Productivity
If transistor density is increased for higher computational power, then processing capability improves, but self-heating effect intensifies, leading to performance degradation and reliability failures
Solution Approach 1:
The cooling channels are formed and integrated into the substrate before transistor fabrication begins. This preliminary integration ensures that heat extraction pathways are already in place before high-density transistor arrays are created, preventing thermal accumulation from compromising transistor performance or reliability.
Solution Approach 2:
A dielectric bonding layer is used as an intermediary material to bond two substrates together, forming a through-substrate via structure that enables fluidic channel formation. This intermediary layer facilitates the creation of integrated cooling pathways without disrupting the transistor fabrication process or electrical functionality.
3Loss of energy
If data center energy efficiency is improved to meet sustainability goals, then environmental impact reduces, but thermal management challenges persist due to extreme heat density from packed computers
Solution Approach 1:
The substrate itself serves dual functions: as the mechanical support for transistors and as the housing for integrated cooling channels. This self-service approach eliminates the need for separate external cooling infrastructure, enabling each processed unit to manage its own heat generation independently and efficiently.
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
This approach enables highly efficient heat removal, reducing thermal limitations and performance degradation, while leveraging the increased power density enabled by dense 3D integration, and is more energy-efficient compared to conventional cooling methods.
Implementation Method 1
nano-fluidic channels directly proximate to CMOS transistors for dielectric liquid immersion, allowing for quasi-instant heat removal through a closed circuit
Implementation Method 2
circulating the dielectric fluid through the wiring structure
Data Source
AI summary
A microfabrication device is provided. The microfabrication device includes a combined substrate including a first substrate connected to a second substrate, the first substrate having first devices and the second substrate having second devices; fluidic passages formed at a connection point between the first substrate and the second substrate, the connection point including a wiring structure that electrically connects first devices to second devices and physically connects the first substrate to the second substrate; dielectric fluid added to the fluidic passages; and a circulating mechanism configured to circulate the dielectric fluid through the fluidic passages to transfer heat.