Durability of nanosized oxygen-barrier coatings on polymers

Leterrier, Y.

doi:10.1016/s0079-6425(02)00002-6

Cited by 472 publications

(360 citation statements)

References 291 publications

(381 reference statements)

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“…In recent years, there have been several investigations dealing with the mechanical failure of inorganic barriers. [5][6][7] As reported in literature, stressinduced cracking is the dominant reason for mechanical failure in barrier layers and subsequent device degradation. The cracking phenomenon is influenced by many factors, such as defect size and location, 5,7-9 internal stress, 10,11 layer thickness, 12,13 and loading type.…”

Section: Introductionmentioning

confidence: 84%

Subcritical crack growth in SiNx thin-film barriers studied by electro-mechanical two-point bending

Guan

Lavèn

Bouten

et al. 2013

Journal of Applied Physics

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Mechanical failure resulting from subcritical crack growth in the SiNx inorganic barrier layer applied on a flexible multilayer structure was studied by an electro-mechanical two-point bending method. A 10 nm conducting tin-doped indium oxide layer was sputtered as an electrical probe to monitor the subcritical crack growth in the 150 nm dielectric SiNx layer carried by a polyethylene naphthalate substrate. In the electro-mechanical two-point bending test, dynamic and static loads were applied to investigate the crack propagation in the barrier layer. As consequence of using two loading modes, the characteristic failure strain and failure time could be determined. The failure probability distribution of strain and lifetime under each loading condition was described by Weibull statistics. In this study, results from the tests in dynamic and static loading modes were linked by a power law description to determine the critical failure over a range of conditions. The fatigue parameter n from the power law reduces greatly from 70 to 31 upon correcting for internal strain. The testing method and analysis tool as described in the paper can be used to understand the limit of thin-film barriers in terms of their mechanical properties.

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Section: Introductionmentioning

confidence: 84%

Subcritical crack growth in SiNx thin-film barriers studied by electro-mechanical two-point bending

Guan

Lavèn

Bouten

et al. 2013

Journal of Applied Physics

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“…In this test the development of crack patterns was analyzed as a function of strain in-situ in a microscope in order to resolve the damage state in layers with sub-micrometer thickness [18,19]. Rectangular samples, of gauge length equal to either 16 mm or 40 mm and width equal to 5.5 mm, were carefully cut from the foils along θ =0°, 30°, 45°, 60°and 90°directions using a scalpel.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Influences of roll-to-roll process and polymer substrate anisotropies on the tensile failure of thin oxide films

et al. 2010

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The influence of internal stress anisotropy resulting from anisotropic loading in a roll-to-roll (R2R) process, and polymer substrate anisotropy on the crack onset strain (COS) of thin oxide coatings was analyzed. Experimental data obtained for R2R processed films were compared with data obtained using an isotropic sheet-to-sheet (S2S) process with the same anisotropic substrate. In the R2R case the COS was found to increase by 20% between the transverse direction and the machine direction. In the S2S case the COS was found to be independent of orientation, except at a 45°in-plane orientation with respect to the machine direction, where it was 15% higher. The internal stress in the machine direction could not be determined, presumably due to deposition-induced curvature changes of the polymer substrate, and was therefore fitted to the COS data. Fracture mechanics analysis and finite element modeling of the experimental data showed that the influence of substrate anisotropy was marginal, and that it was the process-induced internal strain in the coating which controlled the COS.

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“…50 MPa). Such very high levels of adhesion suggest that the behavior of the interfacial region is strain hardening and therefore prevents delamination [20], thanks to a high density of covalent bonds formed during plasma deposition [6].…”

Section: Coating Cohesive Strength and Coating/substrate Interfacial mentioning

confidence: 99%

“…Layered materials based on such thin film structures enable extremely low gas permeability, which could be suitable for advanced applications in the field of polymer-based displays [2]. A number of recent studies have shown that the defect structure of the coating control the oxygen and water vapor permeability of the coated film [3,4], as also its mechanical behavior such as cohesive and adhesive properties [5][6][7][8]. Nanosized oxide coatings are characterized by the presence of two types of defects, namely microdefects and nanodefects [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate additives on the mechanical properties of ultrathin oxide coatings on poly(ethylene terephthalate)

Rochat¹,

Leterrier²,

Fayet³

et al. 2005

Surface and Coatings Technology

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The mechanical properties of ultrathin silicon oxide (SiO x ) coatings plasma-deposited on poly(ethylene terephthalate) (PET) films were investigated with particular attention paid to the effect of additives located in the superficial layers of the polymer substrate. The cohesive and adhesive properties of the thin oxide coating were derived from the analysis of fragmentation tests carried out in situ in a scanning electron microscope. The cohesive strength of the coating was determined assuming a Weibull probability of failure of the oxide, and the coating/ substrate interfacial shear strength (IFSS) was calculated by means of a stress transfer analysis with a perfectly plastic interface. It was shown that the presence of additives in the superficial layers of PET substrates leads to a 20% decrease of the crack onset strain, which is due to an increase of the coating defect density, as revealed by means of atomic oxygen etching. The stress concentration induced by coating microdefects was modeled, and was shown to induce a decrease in the cohesive properties of the coating, which correlates with the observed decrease of crack onset strain. Moreover, the adhesion was found to be very high, with a IFSS higher than the substrate bulk shear stress at yield, irrespective of the presence of additives. D

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Durability of nanosized oxygen-barrier coatings on polymers

Cited by 472 publications

References 291 publications

Subcritical crack growth in SiNx thin-film barriers studied by electro-mechanical two-point bending

Subcritical crack growth in SiNx thin-film barriers studied by electro-mechanical two-point bending

Influences of roll-to-roll process and polymer substrate anisotropies on the tensile failure of thin oxide films

Influence of substrate additives on the mechanical properties of ultrathin oxide coatings on poly(ethylene terephthalate)

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