Conductive film

• US 20030008135A1
• Filed: 06/26/2002
• Published: 01/09/2003
• Est. Priority Date: 06/27/2001
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Kawamura, Koichi, Nakayama, Takao, Yagihara, Morio, Takahashi, Miki
• Granted Patent: US 6,811,878 B2
• Time in Patent Office: Days
• US Class Current: 428/336
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: H01B 1/12 organic substances organic macromolecular compounds or compositions C08
• CPC Class Codes: H01B 1/20 Conductive material dispersed in non-conductive organic material organic macromolecular compounds or compositions C08
• CPC Class Codes: H01L 31/022425 for solar cells
• CPC Class Codes: H01L 31/1884 Manufacture of transparent electrodes, e.g. TCO, ITO
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y10T 428/24909 Free metal or mineral containing
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers

Abstract

The present invention relates to a conductive film excellent in electrical conductivity and durability and useful for display elements and solar cells. In particular, the invention relates to a conductive film comprising conductive fine particles adsorbed to a support, a conductive film comprising a transparent conductive layer such as an ITO layer provided on a support, and a conductive film comprising a conductive polymer layer, instead of the ITO layer, formed on a support.

Claims

1. A conductive film comprising a support having introduced to at least one surface thereof ionic groups to which conductive fine particles, having electrical charges so as to be bondable to the ionic groups, are electrostatically bonded.

2. The conductive film according to claim 1, wherein the support comprises a surface graft polymer introduced thereto by graft polymerization.

3. The conductive film according to claim 1, wherein the conductive fine particles are selected from the group consisting of fine particles of a metal, fine particles of an oxide semiconductor, fine particles containing impurities as a dopant, fine particles of a spinel structure compound, fine particles of a conductive nitride, fine particles of a conductive boride compound and fine particles of a conductive polymer.

4. The conductive film according to claim 3, wherein the conductive fine particles have a particle size in the range of 0.1 nm to 1000 nm.

5. A conductive film comprising a support, which includes hydrophilic graft polymer chains, and a layer of a conductive material provided on the support.

6. The conductive film according to claim 5, wherein the layer of the conductive material has a thickness in the range of 1 nm to 2 μ

m.

7. The conductive film according to claim 5, wherein the hydrophilic graft copolymer chains have a molecular weight of 500 to 5,000,000.

8. The conductive film according to claim 5, wherein the hydrophilic graft copolymer chains form a hydrophilic surface having a thickness in the range of 0.001 μ

m to 10 μ

m.

9. The conductive film according to claim 6, wherein the conductive material is a metal selected from the group consisting of Pd, Au, Ag, Pt, Cu, Rh, Al and Cr.

10. The conductive film according to claim 6, wherein the conductive material is a metal oxide semiconductor selected from the group consisting of In₂O₃, SnO₂, ZnO, CdO, TiO₂, CdIn₂O₄, Cd₂SnO₂, Zn₂SnO₄ and In₂O₃—

ZnO.

11. The conductive film according to claim 6, wherein the conductive material is at least one of indium oxide (ITO) containing SnO₂ as a dopant and tin oxide (SnO₂) containing Sb or F as a dopant.

12. The conductive film according to claim 5, wherein the layer of the conductive material is formed by a vapor phase method selected from the group consisting of chemical vapor deposition, vacuum deposition and sputtering.

14. The conductive film according to claim 13, wherein the hydrophilic polymer contains hydrophilic graft polymer chains.

15. The conductive film according to claim 14, wherein the hydrophilic polymer forms a hydrophilic surface having a thickness in the range of 0.001 μ

m to 10 μ

m.

16. The conductive film according to claim 14, wherein the hydrophilic graft polymer chains have a molecular weight in the range of 500 to 5,000,000.

17. The conductive film according to claim 13, wherein the conductive polymer has a conductivity of 10⁻

6 s·

cm<sup>−

1</sup> or more.

18. The conductive film according to claim 13, wherein the conductive polymer has a conductivity of 10⁻

1 s·

cm<sup>−

1</sup> or more.

19. The conductive film according to claim 17, wherein the conductive polymer is selected from the group consisting of substituted or non-substituted conductive polyaniline, polyparaphenylene, polyparaphenylene vinylene, polythiophene, polyfuran, polypyrrole, polyselenophene, polyisothianaphthene, polyphenylene sulfide, polyacetylene, polypyridyl vinylene and polyazine.

20. The conductive film according to claim 13, wherein the layer of the conductive polymer has a thickness in the range of 1 nm to 2 μ

m.

13. A conductive film comprising a support, which includes hydrophilic polymer chains, and a layer of a conductive polymer provided on the support.