Kim Kisoo, Kim Sungjoo, Jung Gwan Ho, Lee Ilhwan, Kim Sungjun, Ham Juyoung, Dong Wan Jae, Hong Kihyon, Lee Jong-Lam
Division of Advanced Materials Science, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) Pohang 790-784 Korea
RSC Adv. 2018 Mar 19;8(20):10883-10888. doi: 10.1039/c8ra00298c. eCollection 2018 Mar 16.
We present an innovative approach to fabricate an extremely flat (EF) metal film which was done by depositing metal on an extremely flat mother substrate, then detaching the metal from the substrate. The detached flexible metal films had a roughness that was within 2% of the roughness of the mother substrate, so EFs with < 1 nm could be fabricated using the surface roughness transfer method. With quantitative analysis using synchrotron XPS, it was concluded that the chemical reaction of oxygen atoms with the metal film played a critical role in designing a peel-off system to get extremely flat metal films from the mother substrate. The OLED was successfully implemented on the metal film. The OLED's luminance could be increased from 15 142 to 17 100 cd m at 25 mA m by replacing the glass substrate with an EF copper (Cu) substrate, due to the enhanced heat dissipation during the operation. This novel method can be very useful for mass production of large scale, low-cost and high quality metal films using roll-to-roll process.
我们提出了一种制造超平（EF）金属薄膜的创新方法，该方法是先在超平的母基板上沉积金属，然后将金属从基板上分离。分离后的柔性金属薄膜的粗糙度在母基板粗糙度的2%以内，因此可以使用表面粗糙度转移方法制造粗糙度小于1nm的超平薄膜。通过同步加速器XPS进行定量分析，得出氧原子与金属薄膜的化学反应在设计从母基板上剥离以获得超平金属薄膜的剥离系统中起着关键作用。在该金属薄膜上成功实现了有机发光二极管（OLED）。通过用超平铜（Cu）基板代替玻璃基板，由于运行过程中散热增强，OLED在25mA/m²时的亮度可从15142cd/m²提高到17100cd/m²。这种新方法对于使用卷对卷工艺大规模生产低成本、高质量的金属薄膜非常有用。
