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    Understanding the mechanisms that change the conductivity of damaged ITO-coated polymeric films: A micro-mechanical investigation

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    Type
    Article
    Authors
    Nasr Saleh, Mohamed
    Lubineau, Gilles cc
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-11
    Permanent link to this record
    http://hdl.handle.net/10754/563814
    
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    Abstract
    Degradation from mechanical loading of transparent electrodes made of indium tin oxide (ITO) endangers the integrity of any material based on these electrodes, including flexible organic solar cells. However, how different schemes of degradation change the conductivity of ITO devices remains unclear. We propose a systematic micro-mechanics-based approach to clarify the relationship between degradation and changes in electrical resistance. By comparing experimentally measured channel crack densities to changes in electrical resistance returned by the different micro-mechanical schemes, we highlight the key role played by the residual conductivity in the interface between the ITO electrode and its substrate after delamination. We demonstrate that channel cracking alone does not explain the experimental observations. Our results indicate that delamination has to take place between the ITO electrode and the substrate layers and that the residual conductivity of this delaminated interface plays a major role in changes in electrical resistance of the degraded device. © 2014 Elsevier B.V.
    Sponsors
    Funding for this study was provided by KAUST-OCRF. The authors are grateful to King Abdullah University of Science and Technology for its financial support (AEA Round 3 project "Hierarchically-based Adaptive and Flexible Electronic Energy Harvesting Membranes for Large Surface Area Deployment").
    Publisher
    Elsevier BV
    Journal
    Solar Energy Materials and Solar Cells
    DOI
    10.1016/j.solmat.2014.07.011
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.solmat.2014.07.011
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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