Fatigue life study of ITO/PET specimens in cyclic bending tests

Li, Tse Chang; Lin, Jen Fin

doi:10.1007/s10854-014-2392-2

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…The AFM results indicate that cracks are not initiated at the ITO outer surface. A similar observation has been reported by Li and Lin [16] that cracks are preferentially initiated at the interface between ITO layer and substrate during bending.…”

Section: Failure Analysissupporting

confidence: 88%

“…For prolonged use of such devices, long-term failure mechanisms related to electrical characteristics of conductive layers of flexible organic optoelectronics should be considered. Although investigations on electrical conductivity of ITO thin films under bending have been conducted in previous studies, the change of electrical conductivity is mostly assessed after cyclic bending [12,[15][16][17]20,22,31,42,[48][49][50][51] or static bending [40]. However, it is necessary to study the concurrent change of electrical conductivity of ITO thin film under long-term mechanical bending, and its correlation with the mechanical failure mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Conductive Characteristics of Indium Tin Oxide Thin Film on Polymeric Substrate under Long-Term Static Deformation

Tran

Lin

2018

Coatings

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The objective of this study is to investigate the effect of long-term static bending on the conductive characteristics of indium tin oxide (ITO) thin film in flexible optoelectronics. Two types of substrate are considered, namely ITO on polyethylene naphthalate (ITO/PEN) and ITO on polyethylene terephthalate (ITO/PET). Electrical properties of the ITO/PEN and ITO/PET sheets are measured in situ under static bending at various radii of curvature. Experimental results indicate that no significant change in electrical resistance of the ITO/PEN and ITO/PET sheets is found for compressive bending after 1000 h at a curvature radius of 10 mm or larger. However, the ITO/PEN and ITO/PET sheets are seriously damaged under a tensile bending of 10 mm radius and 5 mm radius, respectively. The given ITO/PET sheet exhibits a greater resistance to long-term mechanical bending than the ITO/PEN one, which is attributed to the effect of stiffness and thickness of substrate. As the given PET substrate has a lower stiffness and thickness than the PEN one, ITO thin film in the ITO/PET sheet has a smaller stress given a bending radius. Consequently, a smaller extent of change in the electrical conductance of ITO thin film is found in the ITO/PET sheet.

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Section: Failure Analysissupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Conductive Characteristics of Indium Tin Oxide Thin Film on Polymeric Substrate under Long-Term Static Deformation

Tran

Lin

2018

Coatings

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“…A bend radius of 0.75cm-1cm has been shown to have no influence on the resistance of the PET-ITO [45]. However, not only the bend radius is increasing the resistance of the PET-ITO but also repetitive bending as it leads to microcracks [46,47]. Given results presented by Li and Lin it is expected that after ca.…”

Section: Prototyping Transprint Displaysmentioning

confidence: 99%

“…Given results presented by Li and Lin it is expected that after ca. 300 bends with 17.3N strain the PET-ITO would reach a level were a significant increase in switching time would be visible and after 2000 bends being most likely be unusable due to the number of microcracks [47].…”

Section: Prototyping Transprint Displaysmentioning

confidence: 99%

TransPrint: A Method for Fabricating Flexible Transparent Free-Form Displays

Jensen

Colley

Häkkilä

et al. 2019

Advances in Human-Computer Interaction

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TransPrint is a method for fabricating flexible, transparent free-form displays based on electrochromism. Using screen-printing or inkjet printing of electrochromic ink, plus a straightforward assembly process, TransPrint enables rapid prototyping of displays by nonexperts. The displays are nonlight-emissive and only require power to switch state and support the integration of capacitive touch sensing for interactivity. We present instructions and best practices on how to design and assemble the displays and discuss the benefits and shortcomings of the TransPrint approach. To demonstrate the broad applicability of the approach, we present six application prototypes.

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“…The effects of bending on the reliability of flexible electronic devices has already been reported in the literature. Li and Jin 13 reported the appearance of microcracks after cyclic bending tests of indium tin oxide films deposited on a polyethylene terephthalate substrate; the electrical resistance increased nonlinearly with a sufficiently large number of cycles. Billah et al 14 reported changes in device performance of flexible amorphous indium gallium zinc oxide thin-film transistors under repeated tensile or compressive bending stress; these changes were found to be related to the generation of oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Morphological evolution and migration behavior of silver thin films on flexible substrates during thermal cycle testing

Sun

et al. 2018

Advances in Mechanical Engineering

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To understand morphological evolution and migration behavior caused by stress migration and thermal fatigue of silver thin films on flexible substrates, bending tests were conducted with different bending angles for two types of thermal tests. Furthermore, the effect of stress migration and thermal fatigue on the electrical conductivity of the silver thin films was discussed. The experimental samples were silver thin films printed on flexible paper for these tests. In an ultra-low cycle thermal test, the electrical conductivity of a silver film decreased with increasing bending angle because of the occurrence of voids caused by stress migration. Meanwhile, a high-cycle thermal test caused cracks to form and caused further deterioration of the electrical conductivity owing to a combination of stress migration and thermal fatigue.

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Fatigue life study of ITO/PET specimens in cyclic bending tests

Cited by 13 publications

References 13 publications

Conductive Characteristics of Indium Tin Oxide Thin Film on Polymeric Substrate under Long-Term Static Deformation

Conductive Characteristics of Indium Tin Oxide Thin Film on Polymeric Substrate under Long-Term Static Deformation

TransPrint: A Method for Fabricating Flexible Transparent Free-Form Displays

Morphological evolution and migration behavior of silver thin films on flexible substrates during thermal cycle testing

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