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Title: Multiscale microstructures and microstructural effects on the reliability of microbumps in three-dimensional integration
Authors: Huang, Zhiheng
Xiong, Hua
Wu, Zhiyong
Conway, Paul P.
Altmann, Frank
Issue Date: 2013
Publisher: MDPI (© the authors)
Citation: HUANG, Z., 2013. Multiscale microstructures and microstructural effects on the reliability of microbumps in three-dimensional integration. Materials, 6 (10), pp.4707-4736
Abstract: The dimensions of microbumps in three-dimensional integration reach microscopic scales and thus necessitate a study of the multiscale microstructures in microbumps. Here, we present simulated mesoscale and atomic-scale microstructures of microbumps using phase field and phase field crystal models. Coupled microstructure, mechanical stress, and electromigration modeling was performed to highlight the microstructural effects on the reliability of microbumps. The results suggest that the size and geometry of microbumps can influence both the mesoscale and atomic-scale microstructural formation during solidification. An external stress imposed on the microbump can cause ordered phase growth along the boundaries of the microbump. Mesoscale microstructures formed in the microbumps from solidification, solid state phase separation, and coarsening processes suggest that the microstructures in smaller microbumps are more heterogeneous. Due to the differences in microstructures, the von Mises stress distributions in microbumps of different sizes and geometries vary. In addition, a combined effect resulting from the connectivity of the phase morphology and the amount of interface present in the mesoscale microstructure can influence the electromigration reliability of microbumps.
Description: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Version: Published
DOI: 10.3390/ma6104707
URI: https://dspace.lboro.ac.uk/2134/26076
Publisher Link: http://dx.doi.org/10.3390/ma6104707
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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