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Transparent ultra-thin silver electrodes formed via a maskless evaporation process for applications in flexible organic light-emitting devices

Title
Transparent ultra-thin silver electrodes formed via a maskless evaporation process for applications in flexible organic light-emitting devices
Author
김태환
Keywords
Flexible; Transparent; Ultra-thin silver film; Maskless evaporation; Amine; lexible OLEDs
Issue Date
2020-05
Publisher
ELSEVIER
Citation
NANO ENERGY, v. 71, article no. 104649
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.
URI
https://www.sciencedirect.com/science/article/pii/S2211285520302068?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/166707
ISSN
2211-2855; 2211-3282
DOI
10.1016/j.nanoen.2020.104649
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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