期刊
NANO RESEARCH
卷 15, 期 8, 页码 7476-7483出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4356-9
关键词
silica thin film; sol-gel; flexible encapsulation; mechanical reliability; flexible organic solar cell
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2019R111A3A01054545]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT) [2020M3H4A1A02084911, 2019R1A2C1009025]
Silica thin films synthesized by sol-gel process have high elastic deformation limit and low water vapor transmission rate. They exhibit good resistance to cyclic bending deformations and can effectively encapsulate flexible organic solar cells.
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)center dot 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.
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