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Estimation of the Parameters Determining Strength and Fatigue Behaviors of Arbitrarily-Shaped Polysilicon Thin Films

[+] Author Affiliations
Vu Le Huy, Shoji Kamiya

Nagoya Institute of Technology, Nagoya, Aichi, Japan

Joao Gaspar, Oliver Paul

University of Freiburg, Freiburg, Germany

Paper No. IPACK2011-52250, pp. 409-415; 7 pages
doi:10.1115/IPACK2011-52250
From:
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1
  • Portland, Oregon, USA, July 6–8, 2011
  • ISBN: 978-0-7918-4461-8
  • Copyright © 2011 by ASME

abstract

The fracture and fatigue behaviors of polysilicon thin film structures with arbitrary shapes were formulated by taking the stress distribution into account. The parameters appearing in both Weibull distribution and Paris’ law that describe the static strength and fatigue behaviors, respectively, are estimated using the maximum likelihood method on the basis of the results of tensile static fracture and fatigue tests performed on two types of polysilicon thin film specimens with different shapes fabricated using the same conditions. The difference between the fatigue lifetime distributions between the two types was well explained by applying the formula with a unique set of parameters. These results suggest that the fracture and fatigue behaviors of polysilicon thin films have a unique characteristics regardless of stress distributions.

Copyright © 2011 by ASME

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