Abstract
Due to the vulnerability of organic optoelectronic devices to moisture and oxygen, thin-film moisture barriers have played a critical role in improving the lifetime of the devices. Here, we propose a hexagonal boron nitride (hBN) embedded Al2O3 thin film as a flexible moisture barrier. After layer-by-layer (LBL) staking of polymer and hBN flake composite layer, Al2O3 was deposited on the nano-laminate template by spatial plasma atomic layer deposition (PEALD). Because the hBN flakes in Al2O3 thin film increase the diffusion path of moisture, the composite layer has a low water vapor transmission ratio (WVTR) value of 1.8 × 10−4 g/m2 day. Furthermore, as embedded hBN flakes restrict crack propagation, the composite film exhibits high mechanical stability in repeated 3 mm bending radius fatigue tests.
Highlights
Optoelectronic devices using organic semiconductors have been extensively developed as mechanically flexible and solution-processable devices [1]
Organic semiconductors have been used in various applications such as organic light-emitting diodes (OLEDs) [2] and organic photovoltaics (OPVs) [3] by controlling the molecular structure
Based on the hexagonal boron nitride (hBN) embedded inorganic layer structure, we developed the flexible moisture barrier, which has a water vapor transmission ratio (WVTR) value of 1.81 × 10-4 g/m2 day and is stable in the fatigue bending test at a 3 mm bending radius
Summary
Optoelectronic devices using organic semiconductors have been extensively developed as mechanically flexible and solution-processable devices [1]. Since the organic devices deteriorate rapidly when directly exposed to oxygen or moisture, it is necessary to ensure reliability by encapsulating the organic devices with a protective barrier layer that minimizes the permeation of the deteriorating gases, especially moisture [4,5]. Inorganic glass sheet has been widely used because glass is an excellent gas barrier and easy to handle. An alternative flexible thin-film gas barrier is required because the inorganic glass is vulnerable to mechanical stress caused by bending [6,7].
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