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Title
Japanese: 
English:Evaluation of interfacial strength of multilayer thin films polymer by nanoindentation technique 
Author
Japanese: 井上 健司, トリアワンファリド, 因幡和晃, 岸本喜久雄, 西 将史, 関谷 道代, 関戸 邦彦, 斉藤 章人.  
English: Kenji INOUE, Farid Triawan, Kazuaki Inaba, KIKUO KISHIMOTO, Masashi NISHI, Michiyo SEKIYA, Kunihiko SEKIDO, Akihito SAITOH.  
Language English 
Journal/Book name
Japanese: 
English:Bulletin of the JSME, Mechanical Engineering Journal 
Volume, Number, Page Vol. 6    No. 1    pp. 18-00326
Published date Feb. 15, 2019 
Publisher
Japanese:一般社団法人日本機械学会 
English:The Japan Society of Mechanical Engineers 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
File
Abstract Multilayer thin films polymer have been commonly used in a wide range of electronics applications, such as solar cells, photoconductors, semiconductors, and light-emitting diodes, in which failure due to delamination can occur. For evaluating and improving the quality of a multilayer thin-film product, the interfacial strength between its layers must be measured correctly and accurately. In this work, the interfacial strength of a multilayer thin-film polymer was quantified by measuring the interfacial energy release rate (interfacial fracture toughness), Gi, using the nanoindentation test technique. Three specimens of four-layer thin films were fabricated on a glass substrate. The top layer of each specimen was prepared with different thicknesses. The unloading curve technique introduced by Kozuki and Kishimoto (2010) was implemented to quantify the Gi of each specimen. Then, cross-sectional observation of the specimens was performed to confirm the layer thicknesses and to identify the delamination condition after the test. The measured Gi tended to increase as the range between the two unloading curves used to calculate the delamination energy widened. This phenomenon is believed to be caused by the plastic energy of the deformed films during the indentation process. Finally, an empirical method for eliminating the effect of the plastic energy on the measured Gi was proposed. Using this method, a pure Gi value can be effectively extracted; thus, the interfacial strength of multilayer thin-film polymers can be measured correctly and accurately.

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