Abstract
In this work, two different sheet resistances, 100 and 60
$\Omega$ per square of DC-Magnetron sputtered indium tin oxide (ITO)
thin film on poly ethylene terephthalate (PET) substrate were
stretched up to 15% of the original length under three different
strain rates, 0.01, 0.1, and 1.0 min<sup>-1</sup>. The cracks
development during stretching was monitored using optical
microscope. Two types of cracks were observed: in the first type,
cracks initiated perpendicularly to the tensile load and propagated
towards the edge of the sample, which was observed at 4% strain for
both sheet resistances and different strain rates. In the second
type, cracks initiated from the first type cracks and propagated
perpendicularly to it towards the next original crack. The cracks
intensity for both types of cracks was investigated. The intensity
of both cracks type increases with the strain and sheet resistance.
The electrical resistance was measured every 1% strain during
stretching. The relative electrical resistance change
(Δ<i>R/R</i><sub>0</sub>) was plotted against strain at different strain rates. It
could be concluded that, the relative electrical resistance change
under high strain rate is higher at the beginning of the stretching
process, but after a certain strain, the relative electrical
resistance change under the lower strain rate accelerated till the
film becomes non-conductive while the relative electrical resistance
change under high strain rate is in acceleration process until
reaching non-conductive condition. Analysis of Variance (ANOVA)
results showed that the strain and the sheet resistance are
significant factors on the relative electrical resistance change at
95% confidence level. The strain rate was not significant factor in
the range considered. No two factor interactions are significant as
well.
© 2011 IEEE
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