Transistor-Plane Fluidic Cooling for Self-Heating Reduction
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Solution Overview
Problem
Current cooling solutions for semiconductor devices are inefficient and wasteful due to their distance from nanoscale heat sources, leading to significant thermal waste and performance degradation, especially in densely packed data centers where heat management is critical for sustainability and performance.
Innovation Solution
The implementation of nano-fluidic channels within semiconductor devices to directly immerse dielectric liquids in close proximity to transistors for efficient heat removal, with a closed circuit at the transistor level and secondary cooling at the chip surface, utilizing MEMs micro-pumps for fluid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional cooling solutions (heatsinks, fans, air-cooling) are used at package or board level, then cooling coverage is provided, but the distance from heat sources is too large resulting in inefficient heat removal and significant thermal waste
Solution Approach 1:
The patent transitions from conventional planar cooling at package/board level to three-dimensional cooling channels formed within the transistor stack itself. By etching vertical and horizontal channels through multiple layers of the semiconductor device, the cooling system achieves proximity to heat sources in the z-dimension (vertical), dramatically reducing thermal resistance and energy loss while maintaining structural integrity through layered channel formation
Solution Approach 2:
The cooling channels are nested directly within the transistor stack structure, with channels formed through alternating layers of transistors and dielectric materials. This nested configuration allows coolant to flow through the core of the heat-generating structure, maximizing heat removal efficiency while minimizing the distance between coolant and heat sources, thereby reducing thermal waste
2Productivity
If transistor density is increased for technological progress, then computing power improves, but self-heating effect becomes a global primary source of performance cost and environmental cost
Solution Approach 1:
The transistor stack is segmented into alternating layers of transistors and dielectric materials, with cooling channels formed through these segmented layers. This segmentation allows coolant to access heat sources at multiple levels within the stack, enabling efficient heat removal from high-density transistor arrangements and mitigating self-heating effects that would otherwise limit computing power
Solution Approach 2:
A dielectric coolant is introduced as an intermediary substance that flows through channels formed within the transistor stack. This dielectric coolant serves as a thermal intermediary, absorbing heat from high-density transistors and transporting it to external heat exchangers, thereby enabling sustained high computing power without excessive self-heating
3Reliability
If robust cooling solutions are implemented to maintain high performance, then performance degradation is prevented, but energy efficiency decreases due to 40% of data center energy dedicated to cooling
Solution Approach 1:
Cooling channels are formed and integrated within the transistor stack during the manufacturing process, before the device is operational. This preliminary integration ensures that cooling pathways are already in place when high power densities are achieved, enabling immediate and efficient heat removal without requiring additional energy-intensive cooling infrastructure to be added later
Solution Approach 2:
The transistor stack structure itself is modified to provide its own cooling channels, making the device self-cooling. By forming channels through the dielectric layers surrounding the transistors, the structure serves dual purposes: maintaining electrical isolation between transistors and providing thermal management pathways, thereby reducing the need for separate, energy-intensive cooling systems
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 quasi-instant heat removal and significantly reduces thermal waste, enhancing performance and energy efficiency, particularly in dense 3D integration scenarios, and can lead to increased power density and reduced environmental impact.
Implementation Method 1
filling the cavities with a dielectric fluid such that the dielectric fluid is in proximate thermal contact with the semiconductor devices
Implementation Method 2
forming a circulating mechanism to circulate the dielectric fluid from the cavities to a heat dissipation region and back through the cavities
Data Source
AI summary
A microfabrication device is provided. The microfabrication device includes a transistor plane formed on a substrate, the transistor plane including a plurality of field effect transistors; fluidic passages formed within the transistor plane; a dielectric fluid added to the fluidic passages; and a circulating mechanism configured to circulate the dielectric fluid through the transistor plane.