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Indentation damage evaluation on metal-coated thin-films stacked structure

Published online by Cambridge University Press:  21 September 2015

Alfred Yeo ,
Mao Liu  and
Kun Zhou
Alfred Yeo
Affiliation:
Operation Backend Development, Infineon Technologies Asia Pacific Pte Ltd, Singapore349253; and School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore639798
Mao Liu
Affiliation:
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore639798
Kun Zhou*
Affiliation:
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore639798
*
a)Address all correspondence to this author. e-mail: kzhou@ntu.edu.sg
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Abstract

A micro-indentation system integrated with an acoustic emission (AE) sensor is used as a damage test method for crack detection of the specimen during the indentation loading–unloading cycle. The specimens investigated are the Si die, and various stacked structures of metallization (Al or Cu) deposited over the dielectric layers (SiO2 or Si3N4) on the Si substrate. The 1st AE event detected during the loading stage corresponded to the ‘pop-in’ observation in the force–displacement curve, which was related to the brittle cracking in the dielectric or Si substrate. However, during unloading, a 2nd AE event was detected, but no “pop-out” was observed, which was mainly due to the delamination between the dielectric and Si substrate. It was also found that for Si die, “pop-out” was observed without any AE event during the unloading stage, which was related to the Si phase transformation. This observation is unique to sharp indenter tip but not for a blunt indenter tip.

Keywords

acoustic emissioncoatingdielectricindentation damage
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 20 , 28 October 2015 , pp. 3071 - 3083
Copyright
Copyright © Materials Research Society 2015 

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