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Effect of Ag interlayer on the optical and passivation properties of flexible and transparent Al2O3/Ag/Al2O3 multilayer

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3 Author(s)
Jeong, Jin-A ; School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology (KIT), Gumi 730-701, Republic of Korea ; Kim, Han-Ki ; Yi, Min-Su

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We report on the characteristics of a flexible Al2O3/Ag/Al2O3 multilayer passivation grown on a polyethylene terephthalate (PET) substrate as a function of Ag thickness. Due to the surface plasmon resonance (SPR) effects and the ductility of the Ag layer that is sandwiched between the dielectric Al2O3 layer, the flexible Al2O3/Ag/Al2O3 multilayer passivation exhibits a high transparency of 86.44% and improved flexibility at a Ag thickness of 10 nm. We found that SPR effects in the Ag layer occur at the transition region from distinct islands to a continuous film at a critical thickness (∼10 nm). In addition, the water vapor transmission rate of the Al2O3/Ag/Al2O3/PET sample decreased as the thickness of the Ag layer increased. Using synchrotron x-ray scattering and field emission scanning electron microscopy, we suggest a possible mechanism to explain the SPR in the Ag layer of the flexible and transparent Al2O3/Ag/Al2O3 multilayer passivation.

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Applied Physics Letters  (Volume:93 ,  Issue: 3 )