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Microchannel Design Study for 3D Microelectronics Cooling Using a Hybrid Analytical and Finite Element Method

[+] Author Affiliations
L.-M. Collin, V. Fiori, P. Coudrain, S. L. Lhostis

STMicroelectronics, Crolles, France

S. Chéramy, J.-P. Colonna, B. Mathieu

CEA, LETI, Grenoble, France

A. Souifi

INSA de Lyon, Villeurbanne, France

L. G. Fréchette

Université de Sherbrooke, Sherbrooke, QC, Canada

Paper No. ICNMM2015-48830, pp. V001T07A005; 11 pages
doi:10.1115/ICNMM2015-48830
From:
  • ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
  • ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels
  • San Francisco, California, USA, July 6–9, 2015
  • Conference Sponsors: Heat Transfer Division, Fluids Engineering Division
  • ISBN: 978-0-7918-5687-1
  • Copyright © 2015 by ASME

abstract

For microelectronics cooling, microchannels are a potential solution to ensure reliability without sacrificing compactness, as they require relatively small space to remove high heat fluxes compared to air cooling. However, designing microchannels is a complex task where simulation models become a forefront tool to investigate and propose new solutions to increase the chip thermal performances with minimal impact on other aspects.

This work evaluates numerically the impact of microchannel cooling in a standalone chip and a 3D assembly of two stacked chips with localized heat sources. To do so, a modeling approach was developed to combine finite element modeling of conduction in the chip using commercial software with analytical relations to capture the heat transfer and fluid flow in the microchannels. This approach leverages the multiphysics and post-processing capabilities of commercial software, but avoids the extensive discretization that would normally be required in microchannels with full finite element modeling. The study shows that increasing the flow rate is not as beneficial as increasing the number of channels (with constant total cross-section area). The effect of heat spreading was also found to be critical, favoring thicker dies. When switching to 3D chip configuration, the interdie underfill layer significantly increases the total thermal resistance and must be considered for thermal design. This effect can be significantly alleviated by increasing the interdie thermal conductivity through adding copper micropillars.

Copyright © 2015 by ASME

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