Molecular dynamics study on mold fracture by nano scale defects in nanoimprint lithography
Conference: EMLC 2009 - 25th European Mask and Lithography Conference
01/12/2009 - 01/15/2009 at Dresden, Germany
Proceedings: EMLC 2009
Pages: 6Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Tada, K.; Yasuda, M.; Fujii, N.; Kawata, H.; Hirai, Y. (Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan)
Molecular dynamics simulation is performed to study the yield stress and fracture mechanism of single crystalline silicon mold with notch-defect structures. From the stress distribution, it is found that the stress is concentrated near the notch defect and the notch acts as a trigger of the crucial mold fracture. The yield stress with a nano scale notch on the mold sidewall deteriorates more than 7.5 % compared to a defect-free mold. It is found that a surface damage such as notch defect is significant for strength deterioration of the mold. This result shows that the surface defects on the sidewall, which could be induced during the mold fabrication process such as dry etching process, causes serious failure.