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Barrier Film

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Samuel Graham – One of the best experts on this subject based on the ideXlab platform.

  • experimental study of interfacial fracture toughness in a sinx pmma Barrier Film
    ACS Applied Materials & Interfaces, 2012
    Co-Authors: Anuradha Bulusu, Anthony J Giordano, Seth R Marder, Reinhold H Dauskardt, Samuel Graham

    Abstract:

    Organic/inorganic multilayer Barrier Films play an important role in the semihermetic packaging of organic electronic devices. With the rise in use of flexible organic electronics, there exists the potential for mechanical failure due to the loss of adhesion/cohesion when exposed to harsh environmental operating conditions. Although Barrier performance has been the predominant metric for evaluating these encapsulation Films, interfacial adhesion between the organic/inorganic Barrier Films and factors that influence their mechanical strength and reliability has received little attention. In this work, we present the interfacial fracture toughness of a model organic/inorganic multilayer Barrier (SiNx–PMMA). Data from four point bending (FPB) tests showed that adhesive failure occurred between the SiNx and PMMA, and that the adhesion increased from 4.8 to 10 J/m2 by using a variety of chemical treatments to vary the surface energy at the interface. Moreover, the adhesion strength increased to 28 J/m2 by crea…

  • Experimental Study of Interfacial Fracture Toughness in a SiNx/PMMA Barrier Film
    ACS Applied Materials & Interfaces, 2012
    Co-Authors: Yongjin Kim, Anuradha Bulusu, Anthony J Giordano, Seth R Marder, Reinhold H Dauskardt, Samuel Graham

    Abstract:

    Organic/inorganic multilayer Barrier Films play an important role in the semihermetic packaging of organic electronic devices. With the rise in use of flexible organic electronics, there exists the potential for mechanical failure due to the loss of adhesion/cohesion when exposed to harsh environmental operating conditions. Although Barrier performance has been the predominant metric for evaluating these encapsulation Films, interfacial adhesion between the organic/inorganic Barrier Films and factors that influence their mechanical strength and reliability has received little attention. In this work, we present the interfacial fracture toughness of a model organic/inorganic multilayer Barrier (SiNx–PMMA). Data from four point bending (FPB) tests showed that adhesive failure occurred between the SiNx and PMMA, and that the adhesion increased from 4.8 to 10 J/m2 by using a variety of chemical treatments to vary the surface energy at the interface. Moreover, the adhesion strength increased to 28 J/m2 by crea…

  • a correlation study between Barrier Film performance and shelf lifetime of encapsulated organic solar cells
    Solar Energy Materials and Solar Cells, 2012
    Co-Authors: Namsu Kim, William J Potscavage, Annapoorani Sundaramoothi, Clifford L Henderson, Bernard Kippelen, Samuel Graham

    Abstract:

    Abstract In this study, the overall Barrier performance of multilayer thin-Films and the shelf lifetime of encapsulated organic solar cells were correlated through the total amount of water vapor that permeated into the solar cell. Effective water vapor transmission rates were measured in both the transient and steady-state transport regimes for multilayer Barrier Films consisting of SiNx and parylene. The efficiency of pentacene/C60-based solar cells encapsulated with one or two pairs of SiNx/parylene dropped to 50% after permeation of about 1.63 g/m2 of water vapor regardless of effective transmission rate of the Barrier. From these calculations, cells encapsulated with three dyads were predicted to maintain performance for at least 13,500 h while experiments up to 7500 h showed less than 10% degradation in performance.

Bojan Zajec – One of the best experts on this subject based on the ideXlab platform.

  • hydrogen permeation Barrier recognition of defective Barrier Film from transient permeation rate
    International Journal of Hydrogen Energy, 2011
    Co-Authors: Bojan Zajec

    Abstract:

    Hydrogen permeation Barrier Films often exhibit lower efficiency than anticipated. The cause could be defects in the Barrier Film, high permeability of the defect-free (dense) Barrier Film, or a combination of both. It is very difficult to point at and quantify the responsible mechanism since the defects can be of submicrometer dimensions and very sparsely populated. This study addresses the recognition of the defects in the hydrogen permeation Barrier Films using the hydrogen permeation rate transient evolution analysis. For this purpose a mathematical model of the steady-state and transient hydrogen permeation through the membrane coated either with a defective or a defect-free Barrier Film was developed for the diffusion limited permeation regime. Analysis shows that a defective Barrier Film might be recognized only in a transient permeation experiment. The effective diffusion coefficient of the membrane with the defect-free Barrier Film is variable and depends mainly on the ratio of diffusion coefficients in the Film and the substrate. Contrary to this, the transient permeation only through pinholes has a constant value of the effective diffusion coefficient. Result of the study is an experimentally useful criterion when and how the permeation through the defects in the Barrier layer can be recognized and its extent determined.

  • Hydrogen permeation Barrier – Recognition of defective Barrier Film from transient permeation rate
    International Journal of Hydrogen Energy, 2011
    Co-Authors: Bojan Zajec

    Abstract:

    Hydrogen permeation Barrier Films often exhibit lower efficiency than anticipated. The cause could be defects in the Barrier Film, high permeability of the defect-free (dense) Barrier Film, or a combination of both. It is very difficult to point at and quantify the responsible mechanism since the defects can be of submicrometer dimensions and very sparsely populated. This study addresses the recognition of the defects in the hydrogen permeation Barrier Films using the hydrogen permeation rate transient evolution analysis. For this purpose a mathematical model of the steady-state and transient hydrogen permeation through the membrane coated either with a defective or a defect-free Barrier Film was developed for the diffusion limited permeation regime. Analysis shows that a defective Barrier Film might be recognized only in a transient permeation experiment. The effective diffusion coefficient of the membrane with the defect-free Barrier Film is variable and depends mainly on the ratio of diffusion coefficients in the Film and the substrate. Contrary to this, the transient permeation only through pinholes has a constant value of the effective diffusion coefficient. Result of the study is an experimentally useful criterion when and how the permeation through the defects in the Barrier layer can be recognized and its extent determined.

Anuradha Bulusu – One of the best experts on this subject based on the ideXlab platform.

  • experimental study of interfacial fracture toughness in a sinx pmma Barrier Film
    ACS Applied Materials & Interfaces, 2012
    Co-Authors: Anuradha Bulusu, Anthony J Giordano, Seth R Marder, Reinhold H Dauskardt, Samuel Graham

    Abstract:

    Organic/inorganic multilayer Barrier Films play an important role in the semihermetic packaging of organic electronic devices. With the rise in use of flexible organic electronics, there exists the potential for mechanical failure due to the loss of adhesion/cohesion when exposed to harsh environmental operating conditions. Although Barrier performance has been the predominant metric for evaluating these encapsulation Films, interfacial adhesion between the organic/inorganic Barrier Films and factors that influence their mechanical strength and reliability has received little attention. In this work, we present the interfacial fracture toughness of a model organic/inorganic multilayer Barrier (SiNx–PMMA). Data from four point bending (FPB) tests showed that adhesive failure occurred between the SiNx and PMMA, and that the adhesion increased from 4.8 to 10 J/m2 by using a variety of chemical treatments to vary the surface energy at the interface. Moreover, the adhesion strength increased to 28 J/m2 by crea…

  • Experimental Study of Interfacial Fracture Toughness in a SiNx/PMMA Barrier Film
    ACS Applied Materials & Interfaces, 2012
    Co-Authors: Yongjin Kim, Anuradha Bulusu, Anthony J Giordano, Seth R Marder, Reinhold H Dauskardt, Samuel Graham

    Abstract:

    Organic/inorganic multilayer Barrier Films play an important role in the semihermetic packaging of organic electronic devices. With the rise in use of flexible organic electronics, there exists the potential for mechanical failure due to the loss of adhesion/cohesion when exposed to harsh environmental operating conditions. Although Barrier performance has been the predominant metric for evaluating these encapsulation Films, interfacial adhesion between the organic/inorganic Barrier Films and factors that influence their mechanical strength and reliability has received little attention. In this work, we present the interfacial fracture toughness of a model organic/inorganic multilayer Barrier (SiNx–PMMA). Data from four point bending (FPB) tests showed that adhesive failure occurred between the SiNx and PMMA, and that the adhesion increased from 4.8 to 10 J/m2 by using a variety of chemical treatments to vary the surface energy at the interface. Moreover, the adhesion strength increased to 28 J/m2 by crea…