A composite layer of atomic-layer-deposited Al2O3 and graphene for flexible moisture barrier

Taewook Nam; Yong Ju Park; Haksoo Lee; Il Kwon Oh; Jong Hyun Ahn; Sung Min Cho; Hyungjun Kim; Han Bo Ram Lee

doi:10.1016/j.carbon.2017.02.023

A composite layer of atomic-layer-deposited Al₂O₃ and graphene for flexible moisture barrier

Taewook Nam, Yong Ju Park, Haksoo Lee, Il Kwon Oh, Jong Hyun Ahn, Sung Min Cho, Hyungjun Kim, Han Bo Ram Lee

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

In this study, a composite layer of atomic-layer-deposition-grown Al₂O₃ (ALD Al₂O₃) on chemical-vapor-deposition-grown graphene (CVD graphene) was fabricated for encapsulation of an organic light-emitting diode (OLED). NO₂ functionalization was adopted to improve the nucleation and film quality of the ALD Al₂O₃ on CVD graphene, and the resulting Al₂O₃ on NO₂-functionalized graphene exhibited increased film density and decreased porosity and roughness compared to that without functionalization; these improved properties satisfy the requirements for encapsulation layers. In addition, the water vapor barrier property of the Al₂O₃ and graphene composite layer was improved compared with that of a single Al₂O₃ layer; a single graphene layer did not exhibit the barrier property because of inherent defects. According to the laminate theory, the calculated water vapor transmission rate of graphene in the composite layer was about 2 × 10⁻³ g/m²·day, which is much greater than that of the single graphene layer without Al₂O₃ because of the combinational effects of the Al₂O₃ layer. Furthermore, the permeability of graphene was almost unchanged before and after the application of bending stress because of its mechanical durability and flexibility. This ALD Al₂O₃/graphene composite is expected to be a promising encapsulation layer for future flexible OLED devices.

Original language	English
Pages (from-to)	553-561
Number of pages	9
Journal	Carbon
Volume	116
DOIs	https://doi.org/10.1016/j.carbon.2017.02.023
Publication status	Published - 2017 May 1

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2014R1A1A2059845), Center for Integrated Smart Sensors funded by the Ministry of Science, ICT & Future Planning as Global Frontier Project (CISS-2011-0031848), Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Ministry of Trade, Industry and Energy (MOTIE) (Project No. 10050296, Large scale (Over 8“) synthesis and evaluation technology of 2-dimensional chalcogenides for next-generation electronic devices), and a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP No. NRF-2014R1A2A1A11052588).

Publisher Copyright:
© 2017 Elsevier Ltd

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)

Access to Document

10.1016/j.carbon.2017.02.023

Cite this

@article{763a3058ff7d45728baa758162936ef0,

title = "A composite layer of atomic-layer-deposited Al2O3 and graphene for flexible moisture barrier",

abstract = "In this study, a composite layer of atomic-layer-deposition-grown Al2O3 (ALD Al2O3) on chemical-vapor-deposition-grown graphene (CVD graphene) was fabricated for encapsulation of an organic light-emitting diode (OLED). NO2 functionalization was adopted to improve the nucleation and film quality of the ALD Al2O3 on CVD graphene, and the resulting Al2O3 on NO2-functionalized graphene exhibited increased film density and decreased porosity and roughness compared to that without functionalization; these improved properties satisfy the requirements for encapsulation layers. In addition, the water vapor barrier property of the Al2O3 and graphene composite layer was improved compared with that of a single Al2O3 layer; a single graphene layer did not exhibit the barrier property because of inherent defects. According to the laminate theory, the calculated water vapor transmission rate of graphene in the composite layer was about 2 × 10−3 g/m2·day, which is much greater than that of the single graphene layer without Al2O3 because of the combinational effects of the Al2O3 layer. Furthermore, the permeability of graphene was almost unchanged before and after the application of bending stress because of its mechanical durability and flexibility. This ALD Al2O3/graphene composite is expected to be a promising encapsulation layer for future flexible OLED devices.",

author = "Taewook Nam and Park, {Yong Ju} and Haksoo Lee and Oh, {Il Kwon} and Ahn, {Jong Hyun} and Cho, {Sung Min} and Hyungjun Kim and Lee, {Han Bo Ram}",

note = "Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2014R1A1A2059845), Center for Integrated Smart Sensors funded by the Ministry of Science, ICT & Future Planning as Global Frontier Project (CISS-2011-0031848), Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Ministry of Trade, Industry and Energy (MOTIE) (Project No. 10050296, Large scale (Over 8“) synthesis and evaluation technology of 2-dimensional chalcogenides for next-generation electronic devices), and a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP No. NRF-2014R1A2A1A11052588). Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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doi = "10.1016/j.carbon.2017.02.023",

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T1 - A composite layer of atomic-layer-deposited Al2O3 and graphene for flexible moisture barrier

AU - Nam, Taewook

AU - Park, Yong Ju

AU - Lee, Haksoo

AU - Oh, Il Kwon

AU - Ahn, Jong Hyun

AU - Cho, Sung Min

AU - Kim, Hyungjun

AU - Lee, Han Bo Ram

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PY - 2017/5/1

Y1 - 2017/5/1

N2 - In this study, a composite layer of atomic-layer-deposition-grown Al2O3 (ALD Al2O3) on chemical-vapor-deposition-grown graphene (CVD graphene) was fabricated for encapsulation of an organic light-emitting diode (OLED). NO2 functionalization was adopted to improve the nucleation and film quality of the ALD Al2O3 on CVD graphene, and the resulting Al2O3 on NO2-functionalized graphene exhibited increased film density and decreased porosity and roughness compared to that without functionalization; these improved properties satisfy the requirements for encapsulation layers. In addition, the water vapor barrier property of the Al2O3 and graphene composite layer was improved compared with that of a single Al2O3 layer; a single graphene layer did not exhibit the barrier property because of inherent defects. According to the laminate theory, the calculated water vapor transmission rate of graphene in the composite layer was about 2 × 10−3 g/m2·day, which is much greater than that of the single graphene layer without Al2O3 because of the combinational effects of the Al2O3 layer. Furthermore, the permeability of graphene was almost unchanged before and after the application of bending stress because of its mechanical durability and flexibility. This ALD Al2O3/graphene composite is expected to be a promising encapsulation layer for future flexible OLED devices.

AB - In this study, a composite layer of atomic-layer-deposition-grown Al2O3 (ALD Al2O3) on chemical-vapor-deposition-grown graphene (CVD graphene) was fabricated for encapsulation of an organic light-emitting diode (OLED). NO2 functionalization was adopted to improve the nucleation and film quality of the ALD Al2O3 on CVD graphene, and the resulting Al2O3 on NO2-functionalized graphene exhibited increased film density and decreased porosity and roughness compared to that without functionalization; these improved properties satisfy the requirements for encapsulation layers. In addition, the water vapor barrier property of the Al2O3 and graphene composite layer was improved compared with that of a single Al2O3 layer; a single graphene layer did not exhibit the barrier property because of inherent defects. According to the laminate theory, the calculated water vapor transmission rate of graphene in the composite layer was about 2 × 10−3 g/m2·day, which is much greater than that of the single graphene layer without Al2O3 because of the combinational effects of the Al2O3 layer. Furthermore, the permeability of graphene was almost unchanged before and after the application of bending stress because of its mechanical durability and flexibility. This ALD Al2O3/graphene composite is expected to be a promising encapsulation layer for future flexible OLED devices.

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