Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors

Title
Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors
Authors
최경준남수지이영빈이미진장재영김상진정용진김형근배수강유지범조성민최재붕정호균안종현박찬언홍병희
Keywords
graphene barrier; water vapor transmittance rate; OFETs; bending cycles
Issue Date
2015-05
Publisher
ACS Nano
Citation
VOL 9, NO 6, 5818-5824
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/49800
ISSN
19360851
Appears in Collections:
KIST Publication > Article
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