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Download fileA method for quantification of the effects of size and geometry on the microstructure of miniature interconnects
journal contribution
posted on 2017-10-05, 15:56 authored by Hua Xiong, Zhiheng Huang, Paul ConwayPaul ConwayBecause the heterogeneity of microstructure has significant effects on the material properties of ultrafine interconnects, it should be quantified, to facilitate high-fidelity prediction of reliability. To address this challenge, a method based on autocorrelation and singular value decomposition is proposed for quantitative characterization of microstructure. The method was validated by developing a quantitative relationship between reported microstructure and tensile strength for SnAgCuRE solders reported in the literature. The method was used to study the effects of size and geometry in ultrafine Sn37Pb interconnects on microstructure and von Mises stress, which were obtained simultaneously by coupling a phase-field model with an elastic mechanical model. By use of this method the degree of heterogeneity of the microstructure in relation to preferred growth directions of the phases was quantified by use of a scalar microstructure index. It was found that microstructure heterogeneity increases with decreasing standoff height, and is higher for hourglass-shaped solder joints. The average von Mises stress was found to be positively related to the microstructure index. The strong correlation between microstructure index and average von Mises stress was confirmed by nonlinear regression analysis using an artificial neural network. This indicates that the mechanical behavior of ultrafine interconnects can be predicted more accurately on the basis of the microstructure index.
Funding
The authors wish to acknowledge financial support from the National Natural Science Foundation of China (NSFC) under grant no. 51004118, the Pearl River New Science Star Program of Guangzhou under grant no. 2012J2200074, the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry (SYSU internal grant no. 30000-4105346).
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Journal of Electronic MaterialsVolume
43Issue
2Pages
618 - 629Citation
XIONG, H., HUANG, Z. and CONWAY, P.P., 2013. A method for quantification of the effects of size and geometry on the microstructure of miniature interconnects. Journal of Electronic Materials, 43 (2), pp. 618-629.Publisher
Springer © TMSVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2013Notes
The final publication is available at link.springer.com via http://dx.doi.org/10.1007/s11664-013-2907-2.ISSN
0361-5235eISSN
1543-186XPublisher version
Language
- en