Transparent electrode and method for producing same

Patent metadata

Field	Value
Publication number	US-9854670-B2
Application number	US-201414913161-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Aug 22, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

Provided are a transparent electrode and a production method thereof, the transparent electrode using metal nanowires and/or metal nanotubes as conductive components, and showing favorable surface flatness, conductivity, and light transmittance. A transparent conductive ink is prepared by dispersing metal nanowires and/or metal nanotubes in a solution formed by dissolving a thermoset or thermoplastic binder resin having no fluidity within the range of 5 to 40° C. to a solvent, the content of the binder resin being 100 to 2500 parts by mass relative to 100 parts by mass of the metal nanowires and/or metal nanotubes. An electrode pattern having a desired shape is printed on a substrate with the transparent conductive ink, and pulsed light is irradiated to the printed electrode pattern, to thereby obtain a transparent electrode having a surface resistance of 0.1 to 500Ω/□ and a surface arithmetic average roughness Ra satisfying Ra≦5 nm.

First claim

The invention claimed is:

1. A method for producing transparent electrode comprising:
a step of printing an electrode pattern having a desired shape on a substrate with a transparent conductive ink having a viscosity of 300 mPa·s to 2×10 5 mPa·s at 25° C., the transparent conductive ink being prepared by dispersing metal nanowires and/or metal nanotubes in a solution formed by dissolving a thermoset or thermoplastic binder resin having no fluidity within the range of 5 to 40° C. to a solvent, and the content of the binder resin being 100 to 2500 parts by mass relative to 100 parts by mass of the metal nanowires and/or metal nanotubes; and
a step of irradiating pulsed light to the printed electrode pattern,
wherein the transparent electrode has a surface arithmetic average roughness Ra satisfying Ra≦5 nm.

2. The method for producing transparent electrode according to claim 1 , wherein the solvent contains an organic solvent.

3. The transparent conductive ink according to claim 2 , wherein the organic solvent has a boiling point of 50° C. or more and 200° C. or less.

4. The transparent conductive ink according to claim 2 , wherein the organic solvent has a boiling point of 120° C. or more and 360° C. or less.

5. The method for producing transparent electrode according to claim 1 , wherein the step of printing is performed by gravure printing and the transparent conductive ink having a viscosity of 300 to 5000 mPa·s at 25° C.

6. The transparent conductive ink according to claim 5 , wherein the organic solvent has a boiling point of 50° C. or more and 200° C. or less.

7. The method for producing transparent electrode according to claim 1 , wherein the step of printing is performed by screen printing and the transparent conductive ink having a viscosity of 1×10 3 to 5×10 4 mPa·s at 25° C.

8. The transparent conductive ink according to claim 7 , wherein the organic solvent has a boiling point of 120° C. or more and 360° C. or less.

9. A transparent conductive ink for forming a transparent electrode comprising metal nanowires and/or metal nanotubes, a solvent, and a thermoset or thermoplastic binder resin having no fluidity within the range of 5 to 40° C. and to be dissolved in the solvent, the content of the binder resin being 100 to 2500 parts by mass relative to 100 parts by mass of the metal nanowires and/or metal nanotubes,
wherein the transparent conductive ink has a viscosity of 300 mPa·s to 2×10 5 mPa·s at 25° C.

10. The transparent conductive ink according to claim 9 , wherein the solvent contains an organic solvent.

11. The transparent conductive ink according to claim 10 , wherein the organic solvent has a boiling point of 50° C. or more and 200° C. or less.

12. The transparent conductive ink according to claim 10 , wherein the organic solvent has a boiling point of 120° C. or more and 360° C. or less.

13. The transparent conductive ink according to claim 9 , wherein the content of the binder resin is 300 to 2500 parts by mass relative to 100 parts by mass of the metal nanowires and/or metal nanotubes.

Assignees

• Showa Denko Kk

Inventors

• Uchida Hiroshi
• MIYAMURA Yasunao
• OKAZAKI Eri
• Ohata Hideki

Classifications

• C09D11/52

  Electrically conductive inks · CPC title

• H05K2201/0108

  Transparent · CPC title

• H01B1/22 Primary

  the conductive material comprising metals or alloys · CPC title

• H05K2201/026

  Nanotubes or nanowires · CPC title

• C09D11/106

  containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title