Title

Characterizing Interfacial Sliding of through-Silicon-Via by Nano-Indentation

Abstract

In this paper, an experimental method is proposed to determine the shear sliding behavior of the interface between a copper through-silicon-via (TSV) and silicon. This interface was loaded in a nano-indentation experiment on specimens that were fabricated using focused-ion-beam milling. The elastic and plastic properties of the copper via were first characterized by micro-pillar compression experiments. The interfacial sliding is described by a cohesive zone model with a traction-separation relation including a linearly elastic part followed by frictional sliding at a constant shear traction. Both analytical and numerical models were developed for extracting the parameters of the traction-separation relation for the shear behavior of the interface. The average critical shear traction required to initiate interfacial sliding was found to be 77.2 MPa and the corresponding relative displacement across the interface was 182.7 nm, while the frictional shear strength was 25 MPa. The traction-separation relation with the extracted parameters may be used to study via extrusion and associated reliability analysis for integrated TSV structures.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Copper; Electronics packaging; Friction; Nanoindentation; Reliability analysis; Silicon; Analytical and numerical models; Focused ion beam milling; Interfacial sliding; Micro-pillar compressions; Relative displacement; Through-Silicon-Via; Through-Silicon-Via (TSV); Traction-separation relation; Three dimensional integrated circuits; Through-silicon via

International Standard Serial Number (ISSN)

1530-4388

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

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