PEDOT:PSS based electrode and method for manufacturing the same
The present disclosure provides a method for fabricating a PEDOT:PSS-based electrode, comprising the steps of: preparing a PEDOT:PSS thin film formed on a substrate; treating the thin film with a solution containing 75-100 vol % of sulfuric acid or a sulfuric acid derivative; separating the thin film from the solution and rinsing the separated thin film; and drying the rinsed thin film at a temperature between 60° C. and 160° C. The present disclosure also provides a PEDOT:PSS-based electrode fabricated by the method, and an organic electronic device including the electrode.
1. A method for fabricating a PEDOT:PSS-based electrode, comprising the steps of:
preparing a PEDOT:PSS thin film formed on a substrate;
treating the thin film with a solution containing 75-100 vol % of sulfuric acid or a sulfuric acid derivative;
separating the thin film from the solution and rinsing the separated thin film; and
drying the rinsed thin film at a temperature between 60° C. and 160° C.
2. The method of claim 1 , wherein the step of treating the thin film with the solution is performed for 1 minute or more.
3. The method of claim 1 , wherein the step of separating the thin film from the solution and rinsing the separated thin film is performed to remove the sulfuric acid or sulfuric acid derivative attached to a surface of the PEDOT:PSS thin film or remove PSS separated from PEDOT:PSS.
4. The method of claim 1 , wherein the step of separating the thin film from the solution and rinsing the separated thin film is performed using water.
5. The method of claim 1 , wherein the step of treating the thin film with the solution is performed by immersing the thin film in the solution containing 75-100 vol % of the sulfuric acid or sulfuric acid derivative.
6. The method of claim 1 , wherein the sulfuric acid or sulfuric acid derivative is selected from the group consisting of methansulfonic acid, trifluoromethansulfonic acid, sulfuric acid, perchloric acid, benzenesulfonic acid, p-toluenesulfonic acid, 4-ethylbenzenesulfonic acid, 4-sulfophthalic acid, p-xylene-2-sulfonic acid hydrate, 5-amino-1-naphthalenesulfonic acid, 8-amino-2-naphthalenesulfonic acid, 4-amino-2-naphthalenesulfonic acid, taurine, 1,4-butanedisulfonic acid, sulfurous acid, bis(trifluoromethane)sulfonamide), and a mixture of two or more thereof.
7. The method of claim 1 , wherein the substrate is made of a material selected from the group consisting of glass, quartz, Al 2 O 3 and SiC.
8. A PEDOT:PSS-based electrode comprising:
a substrate; and
an electrode composed of a PEDOT:PSS thin film formed on the substrate,
wherein the PEDOT:PSS thin film has a molar ratio of PEDOT to PSS of 1.6-2.0 and a degree of crystallinity of 40% or higher.
9. An organic electronic device having a PEDOT:PSS-based electrode, the organic electronic device comprising:
a substrate;
a first electrode composed of a PEDOT:PSS thin film formed on the substrate;
a photoactive layer disposed on the first electrode; and
a second electrode disposed on the photoactive layer,
wherein the PEDOT:PSS thin film has a molar ratio of PEDOT to PSS of 1.6-2.0 and a degree of crystallinity of 40% or higher.
10. The organic electronic device of claim 9 , wherein the photoactive layer is a light-emitting layer or a photoelectric conversion layer.