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Mechanical integrity of TCO films för flexible polymer-based displays

Leterrier, Yves; Medico, L; Demarco, F; Nånson, J-A E; Betz, U; Escola, M F; Olsson, Maryam LU and Atmny, F (2004) In Thin Solid Films 460(1-2). p.155-166
Abstract
The mechanical integrity of tin-doped indium oxide (ITO) thin films sputtered onto a high temperature aromatic polyester developed for flexible display applications was investigated by means of tensile experiments equipped with electrical measurement, and carried out in-situ in an optical microscope. Attention was paid to the influence of ITO thickness, composition and crystalline microstructure, internal stress, annealing, and polymer substrate. It was observed that process-induced internal stresses were systematically compressive, and that tensile cracks in the ITO always initiated at pin-hole defect sites. A transition from stable to unstable crack growth was detected when crack length was several 100 times coating thickness. The... (More)
The mechanical integrity of tin-doped indium oxide (ITO) thin films sputtered onto a high temperature aromatic polyester developed for flexible display applications was investigated by means of tensile experiments equipped with electrical measurement, and carried out in-situ in an optical microscope. Attention was paid to the influence of ITO thickness, composition and crystalline microstructure, internal stress, annealing, and polymer substrate. It was observed that process-induced internal stresses were systematically compressive, and that tensile cracks in the ITO always initiated at pin-hole defect sites. A transition from stable to unstable crack growth was detected when crack length was several 100 times coating thickness. The occurrence of such a transition, which corresponded to an increase in electrical resistance equal to approximately 10%, indicated that crack propagation controlled the loss of functional performance of the device. It was moreover found that an improved surface quality of the polymer substrate, such as that obtained with planarization hard coats, was a major factor to increase the cohesive properties of ITO thin films. It was also observed that the intrinsic crack onset strain followed classic fracture mechanics scaling, in inverse proportion to the square root of ITO thickness. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Thin Solid Films
volume
460
issue
1-2
pages
155 - 166
publisher
Elsevier
external identifiers
  • scopus:2942562187
ISSN
0040-6090
DOI
10.1016/j.tsf.2004.01.052
language
English
LU publication?
no
id
158b5a2b-bf24-480e-bbfc-632f66bd409f (old id 4645433)
date added to LUP
2014-09-10 13:19:34
date last changed
2017-12-10 04:25:45
@article{158b5a2b-bf24-480e-bbfc-632f66bd409f,
  abstract     = {The mechanical integrity of tin-doped indium oxide (ITO) thin films sputtered onto a high temperature aromatic polyester developed for flexible display applications was investigated by means of tensile experiments equipped with electrical measurement, and carried out in-situ in an optical microscope. Attention was paid to the influence of ITO thickness, composition and crystalline microstructure, internal stress, annealing, and polymer substrate. It was observed that process-induced internal stresses were systematically compressive, and that tensile cracks in the ITO always initiated at pin-hole defect sites. A transition from stable to unstable crack growth was detected when crack length was several 100 times coating thickness. The occurrence of such a transition, which corresponded to an increase in electrical resistance equal to approximately 10%, indicated that crack propagation controlled the loss of functional performance of the device. It was moreover found that an improved surface quality of the polymer substrate, such as that obtained with planarization hard coats, was a major factor to increase the cohesive properties of ITO thin films. It was also observed that the intrinsic crack onset strain followed classic fracture mechanics scaling, in inverse proportion to the square root of ITO thickness.},
  author       = {Leterrier, Yves and Medico, L and Demarco, F and Nånson, J-A E and Betz, U and Escola, M F and Olsson, Maryam and Atmny, F},
  issn         = {0040-6090},
  language     = {eng},
  number       = {1-2},
  pages        = {155--166},
  publisher    = {Elsevier},
  series       = {Thin Solid Films},
  title        = {Mechanical integrity of TCO films för flexible polymer-based displays},
  url          = {http://dx.doi.org/10.1016/j.tsf.2004.01.052},
  volume       = {460},
  year         = {2004},
}