Transparent ultra-thin silver electrodes formed via a maskless evaporation process for applications in flexible organic light-emitting devices
- Authors
- Bae, Sang Kyung; Choo, Dong Chul; Kang, Hwa Seung; Yoo, Keon Ho; Kim, Tae Whan
- Issue Date
- May-2020
- Publisher
- ELSEVIER
- Keywords
- Flexible; Transparent; Ultra-thin silver film; Maskless evaporation; Amine; Flexible OLEDs
- Citation
- NANO ENERGY, v.71, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 71
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/9833
- DOI
- 10.1016/j.nanoen.2020.104649
- ISSN
- 2211-2855
- Abstract
- We have fabricated flexible, transparent, ultra-thin silver (Ag) electrodes by using a maskless deposition process and applied them to organic light-emitting devices (OLEDs). A selective ultraviolet/ozone (UV/O-3) treatment was performed on the polyethylenimine (PEI) polymer layer, which contained amine groups and was coated onto a silicon substrate, in order to form an electrode pattern. An ultra-thin Ag film was deposited in vacuum on the UV/O-3-treated substrate without a mask, resulting in the formation of a flexible, transparent, ultra-thin Ag electrode pattern. The optimum PEI concentration and the optimum UV/O-3 treatment time for the formation of flexible, transparent, Ag electrode patterns were determined from their sheet resistances, optical transmittances, Fourier-transform infrared spectra and X-ray photoelectron spectra. The sheet resistance of the ultra-thin Ag electrode transferred to an epoxy substrate changed within 5% only when the bending diameter of curvature and the number of bending cycles were 5 mm and 3000, respectively. The current density and the luminance of an OLED with a flexible, transparent, ultra-thin Ag electrode deposited on an epoxy substrate were larger than those of an OLED with an indium-tin-oxide (ITO) electrode formed on a polyethylene naphthalate substrate. We have confirmed that the flexible, transparent, ultra-thin Ag electrodes hold promise for use in the fabrication of flexible OLEDs.
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