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

Kyoungjun Choi, Sooji Nam, Youngbin Lee, Mijin Lee, Jaeyoung Jang, Sang Jin Kim, Yong Jin Jeong, Hyeongkeun Kim, Sukang Bae, Ji Beom Yoo, Sung M. Cho, Jae Boong Choi, Ho Kyoon Chung, Jong Hyun Ahn, Chan Eon Park, Byung Hee Hong

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Abstract

Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of organic 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 allow the transmission of small gas molecules. In addition, its outstanding mechanical flexibility and optical transmittance are expected to be useful to overcome the current 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·day initially, and stabilized at ∼.48 g/m2·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.

Original languageEnglish
Pages (from-to)5818-5824
Number of pages7
JournalACS Nano
Volume9
Issue number6
DOIs
Publication statusPublished - 2015 Jun 23

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Choi, K., Nam, S., Lee, Y., Lee, M., Jang, J., Kim, S. J., Jeong, Y. J., Kim, H., Bae, S., Yoo, J. B., Cho, S. M., Choi, J. B., Chung, H. K., Ahn, J. H., Park, C. E., & Hong, B. H. (2015). Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors. ACS Nano, 9(6), 5818-5824. https://doi.org/10.1021/acsnano.5b01161