Toward non-gas-permeable hBN film growth on smooth Fe surface
- Authors
- Ko, Hayoung; Choi, Soo Ho; Kim, Jungmo; Kim, Yong In; Kim, Young-Hoon; Adofo, Laud Anim; Jung, Min-Hyoung; Kim, Young-Min; Jeong, Mun Seok; Kim, Ki Kang; Kim, Soo Min
- Issue Date
- Jul-2021
- Publisher
- IOP PUBLISHING LTD
- Keywords
- hexagonal boron nitride; chemical vapor deposition; Fe foil; Fe deposition; grain growth; smooth surface; water vapor transmission rate
- Citation
- 2D MATERIALS, v.8, no.3, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- 2D MATERIALS
- Volume
- 8
- Number
- 3
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141559
- DOI
- 10.1088/2053-1583/abf761
- ISSN
- 2053-1583
- Abstract
- Flexible, transparent, and thermally stable gas barrier films are required to seal organic-based ultra-thin, flexible, and transparent electronic devices against moisture. Thermally stable, two-dimensional hexagonal boron nitride (hBN) is an ideal non-gas-permeable material with high transparency and flexibility. Nevertheless, the polycrystalline multilayer hBN (m-hBN) grown on a rough Fe foil by chemical vapor deposition is not sufficient for use as a gas barrier due to the non-uniformity and discontinuity of the film. Here, we report a novel method for synthesizing highly uniform and continuous m-hBN films on smooth Fe foil on a wafer scale via deposition of an amorphous Fe layer on a rough Fe foil. The amorphous Fe layer on a unary Fe foil is effectively recrystallized to become a smooth surface via post-thermal annealing treatment at 1100 degrees C. The smoothed surface allows for the uniform precipitation of B and N atoms to form a highly continuous m-hBN film, as confirmed by cross-sectional transmission electron microscopy. m-hBN/graphene heterostructure on polyethylene terephthalate further demonstrates the significant improvement of gas barrier performance; a water vapor transmission rate of 0.01 g m(-2) day is achieved, which is seven times lower than the previously reported value, while retaining a high transparency of 96.4% at a wavelength of 550 nm.
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