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Title: Determining interfacial properties of submicron low- k films on Si substrate by using wedge indentation technique
Authors: Yeap, K.B.
Zeng, K. 
Jiang, H.
Shen, L.
Chi, D.
Issue Date: 2007
Citation: Yeap, K.B., Zeng, K., Jiang, H., Shen, L., Chi, D. (2007). Determining interfacial properties of submicron low- k films on Si substrate by using wedge indentation technique. Journal of Applied Physics 101 (12) : -. ScholarBank@NUS Repository.
Abstract: This article presents studies on using a wedge indentation technique to determine interfacial adhesion properties of low- k dielectric films, namely, methyl-silsesquioxane (MSQ) and black diamond (BD)films, both on a Si substrate. Interfacial crack initiation and propagation processes in the MSQ/Si system are studied by using focused-ion-beam sectioning of the indentation impressions created by wedge tips with 90° and 120° of inclusion angles, respectively. Furthermore, the indentation induced stress is found to be proportional to the ratio of the indentation volume and the interface delamination crack volume for both plane strain and nonplane strain cases. With this analysis, the interface toughness of the MSQ/Si and BD/Si system, in terms of the strain energy release rate, is determined. The interface toughness for the MSQ/Si system is found to be a value of 1.89±0.28 J m2 for the 90° wedge tip indentation and 1.92±0.08 J m2 for the 120° wedge tip indentation. In addition, using the 120° wedge tip, the interface toughnesses of the BD films on the Si substrate with 200 and 500 nm thicknesses are found to be the values of 6.62±1.52 and 6.35±2.27 J m2, respectively. © 2007 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.2749473
Appears in Collections:Staff Publications

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