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1 results

  • Monotonic and cyclic mechanical reliability of metallization lines on polymer substrates

  • Oleksandr Glushko, Andreas Klug, Emil J.W. List-Kratochvil, Megan J. Cordill
  • Journal:
    Journal of Materials Research / Volume 32 / Issue 9 / 15 May 2017
    Published online by Cambridge University Press:
    21 April 2017, pp. 1760-1769
    Print publication:
    15 May 2017

  • Mechanical stability of Ag and Cu printed and evaporated metallization lines on polymer substrates is investigated by means of monotonic tensile and cyclic bending tests. It is shown that lines which demonstrate good performance during monotonic tests fail at lower strains during a cyclic bending tests. Evaporated lines with the grain size of several hundreds of nanometers have good ductility and consequently good stability during monotonic loading but at the same time they fail at low strains during cyclic bending. Printed lines with nanocrystalline microstructure, in contrast, demonstrate more intensive cracking during monotonic loading but higher failure strains during cyclic bending. Apart from the grain size effect, the effect of film thickness on the saturation crack density after cyclic bending is also demonstrated. Thinner films have higher crack density in accordance with the shear lag model.