Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors
- Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors
- 최경준; 남수지; 이영빈; 이미진; 장재영; 김상진; 정용진; 김형근; 배수강; 유지범; 조성민; 최재붕; 정호균; 안종현; 박찬언; 홍병희
- graphene barrier; water vapor transmittance rate; OFETs; bending cycles
- Issue Date
- ACS Nano
- VOL 9, NO 6, 5818-5824
- Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of or anic electronics. Although inorganic materials have been predominantly
employed as the protective layers, their poor mechanical property has hindered the practical application to flexible electronics. The densely packed hexagonal lattice of carbon atoms in graphene does not allowthe transmission of small gas molecules. In addition, its outstanding
mechanical flexibility and optical transmittance are expected to be useful to overcome the cur ent mechanical limit of the inorganic materials. In this paper, we reported the measurement of the water vapor transmission rate (WVTR) through the 6-layer 10 10 cm2 large-area graphene films synthesized by chemical vapor deposition (CVD). The WVTR was measured to be as low as 10 4 g/m2 3 day initially, and stabilized at ∼0.48 g/m2 3 day, which corresponds to 7 times reduction in WVTR compared to bare polymer substrates. We also showed that the graphene-passivated organic field-effect transistors (OFETs) exhibited excellent environmental stability as well as a prolonged lifetime even after 500 bending cycles with strain of 2.3%. We expect that our results would be a good reference showing the graphene's potential as gas barriers for organic electronics.
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