@article{Kim2022, 
author = {Si-Hoon Kim and Gyeong-Seok Hwang and Donghwan Koo and Dong-Hyun Seo and Ye-Pil Kwon and Hansuek Lee and Hyesung Park and Eun-chae Jeon and Ju-Young Kim},
title = {Highly impermeable and flexible silica encapsulation films synthesized by sol–gel process},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {8},
pages = {7476-7483},
keywords = {silica thin film, sol–gel, flexible encapsulation, mechanical reliability, flexible organic solar cell},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4356-9},
doi = {10.1007/s12274-022-4356-9},
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.}
}