3D IC Multi-Layer Microchannels for Hotspot Temperature Reduction
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Solution Overview
Problem
Three-dimensional integrated circuits (3D ICs) face challenges in effectively removing heat from densely packed layers, leading to hotspot temperatures that adversely affect electrical performance.
Innovation Solution
The integration of chip-size double-layer or multi-layer microchannels (DLMC or MLMC) above and below the 3D IC structure, which enhances thermal performance by reducing hotspot temperatures and minimizing the need for fluidic through-silicon vias and pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cooling techniques are used in 3D ICs, then the structure is simple and easy to manufacture, but the heat removal capability is insufficient due to increased integration density
Solution Approach 1:
The patent transitions from conventional two-dimensional cooling approaches to three-dimensional integrated microchannel structures. The microchannels are embedded within the 3D IC architecture itself, utilizing the vertical dimension to create multiple cooling layers that can effectively remove heat from densely packed transistor layers, thereby reducing hotspot temperatures while maintaining manufacturing feasibility through integrated fabrication processes.
Solution Approach 2:
The microchannel cooling structure is nested within the 3D IC architecture. The cooling channels are integrated into the internal structure of the IC, with microchannels positioned between and within transistor layers. This nesting allows the cooling system to occupy the same spatial envelope as the computational structures, removing heat directly at the source without requiring external cooling apparatus.
2Productivity
If the number of chip layers is increased to achieve higher functional density, then productivity improves, but hotspot temperature increases
Solution Approach 1:
The cooling system is segmented into multiple independent microchannel layers that correspond to different transistor layers. Each microchannel layer can be independently designed and optimized for its specific thermal load. This segmentation allows heat to be removed from each layer individually, preventing heat accumulation and hotspot formation even as the number of functional layers increases to boost productivity.
Solution Approach 2:
The solution adds vertical dimensionality to the cooling architecture by stacking multiple microchannel layers throughout the 3D IC structure. This multi-layer cooling approach provides direct thermal pathways from each transistor layer to its corresponding cooling channel, enabling effective heat removal from high-density regions without compromising functional density.
3Temperature
If integrated chip-size double-layer or multi-layer microchannels are used, then thermal performance is optimized and hotspot temperature is reduced, but device complexity increases
Solution Approach 1:
The manufacturing processes for the microchannel cooling structures are merged with the existing 3D IC fabrication工艺流程. The microchannels are formed using modified standard semiconductor manufacturing steps, including etching, deposition, and patterning, that are already employed in IC production. This merging allows the cooling structure to be integrated without requiring entirely new manufacturing equipment or processes, thereby reducing the practical complexity despite the enhanced thermal performance.
Solution Approach 2:
The microchannel structure serves multiple functions simultaneously: it provides thermal management for the 3D IC, acts as a structural component within the device architecture, and can be integrated with existing TSV (through-silicon via) processes. This multi-functionality reduces the need for separate dedicated cooling components, thereby optimizing thermal performance while limiting the increase in overall device complexity.
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 solution significantly reduces hotspot temperatures, achieves substantial weight and size reductions in heat sink equipment, and improves overall cooling performance, making it an effective approach for thermal management in 3D ICs.
Implementation Method 1
microchannels have also been implemented in the electronic cooling systems to improve the thermal performance
Implementation Method 2
Lu and Vafai [9] had established that rectangular-shaped heat pipes (RSHP) and disk-shaped heat pipes (DSHP) heat sinks substantially improved the overall thermal performance
Data Source
AI summary
A three-dimensional integrated circuit apparatus includes a three-dimensional integrated circuit including a group of integrated double-layer microchannels (DLMC) and multi-layer microchannels (MLMC) with optimized thermal performance for the three-dimensional integrated circuit. A heat source can be uniformly distributed in each layer and can be conducted through the layers down to the substrate and up to a spreader and a heat sink, and eventually to ambient air through forced convective heat transfer above the heat sink and natural convective heat transfer under the substrate.