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

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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 x 10(-4) g/(m(2).day) at 60 degrees 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.
Publisher
TSINGHUA UNIV PRESS
Issue Date
2022-08
Language
English
Article Type
Article
Citation

NANO RESEARCH, v.15, no.8, pp.7476 - 7483

ISSN
1998-0124
DOI
10.1007/s12274-022-4356-9
URI
http://hdl.handle.net/10203/297601
Appears in Collection
PH-Journal Papers(저널논문)
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