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Research Article

Highly impermeable and flexible silica encapsulation films synthesized by sol–gel process

Si-Hoon Kim1,2Gyeong-Seok Hwang2Donghwan Koo2Dong-Hyun Seo1Ye-Pil Kwon1Hansuek Lee3Hyesung Park2,4( )Eun-chae Jeon1( )Ju-Young Kim2,4( )
School of Materials Science and Engineering, University of Ulsan, Techno saneop-ro 55beon-gil 12, Ulsan 44776, Republic of Korea
Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daehak-ro 291, Deajeon 34141, Republic of Korea
Graduate School of Semiconductor Materials and Devices, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
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Graphical Abstract

Silica thin films synthesized sol–gel process are proposed as flexible encapsulation materials. A sol–gel process provides a dense and stable amorphous silica structure, yielding an extremely high elastic deformation limit and extremely low water vapor transmission rate.

Abstract

Silica thin films synthesized sol–gel process are proposed as flexible encapsulation materials. A sol–gel process provides a dense and stable amorphous silica structure, yielding an extremely high elastic deformation limit of 4.9% and extremely low water vapor transmission rate (WVTR) of 2.90 × 10−4 g/(m2∙day) at 60 °C and relative humidity of 85%. The WVTR is not degraded by cyclic bending deformations for the bending radius corresponding to a tensile strain of 3.3% in the silica encapsulation film, implying that the silica thin film is robust against the formation of pinhole-type defects by cyclic bending deformations. Flexible organic solar cells encapsulated with the silica films operate without degradation in power conversion efficiency for 50,000 bending cycles for a bending radius of 6 mm.

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Nano Research
Pages 7476-7483
Cite this article:
Kim S-H, Hwang G-S, Koo D, et al. Highly impermeable and flexible silica encapsulation films synthesized by sol–gel process. Nano Research, 2022, 15(8): 7476-7483. https://doi.org/10.1007/s12274-022-4356-9
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Received: 07 February 2022
Revised: 06 March 2022
Accepted: 23 March 2022
Published: 31 May 2022
© Tsinghua University Press 2022
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