Transparent electrode and method for producing same

Patent metadata

Field	Value
Publication number	US-2016205775-A1
Application number	US-201414913161-A
Country	US
Kind code	A1
Filing date	Aug 14, 2014
Priority date	Aug 22, 2013
Publication date	Jul 14, 2016
Grant date	—

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

1 . A transparent electrode comprising a single conductive layer, the transparent electrode comprising metal nanowires and/or metal nanotubes, and a thermoset or thermoplastic binder resin having no fluidity within the range of 5 to 40° C., and having a surface resistance of 0.1 to 500Ω/□ and a surface arithmetic average roughness Ra satisfying Ra≦5 nm.

2 . A transparent electrode according to claim 1 , wherein the surface arithmetic average roughness Ra satisfies Ra≦4 nm.

3 . A transparent electrode according to claim 1 , wherein the content of the metal nanowires and/or metal nanotubes in the transparent electrode is 4 to 50% by mass.

4 . A transparent electrode according to claim 1 , wherein the metal of the metal nanowires and/or metal nanotubes comprises silver.

5 . A transparent electrode according to claim 1 , wherein the binder resin is at least one selected from a group consisting of poly-N-vinylpyrrolidone, poly-N-vinylcaprolactam, poly-N-vinylacetamide, and poly-N-vinylformamide.

6 . 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, 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.

7 . 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.

Assignees

• Showa Denko Kk

Inventors

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

Classifications

• H05K1/097

  Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence) · CPC title

• H05K1/0306

  Inorganic insulating substrates, e.g. ceramic, glass · CPC title

• H05K2201/0108

  Transparent · CPC title

• C09D11/52

  Electrically conductive inks · CPC title

• H05K2201/026

  Nanotubes or nanowires · CPC title