Zinc oxide-based conductive multilayer structure, process for producing the same, and electronic device

Patent metadata

Field	Value
Publication number	US-9303308-B2
Application number	US-201113696653-A
Country	US
Kind code	B2
Filing date	May 11, 2011
Priority date	May 14, 2010
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A zinc-oxide-based conductive stacked structure 1 includes a substrate 11 and, formed on at least one surface of the substrate, an undercoat layer 12 and a transparent conductive film 13 . The transparent conductive film is formed of a plurality of transparent conductive layers formed from a zinc-oxide-based conductive material and has a carrier density of 2.0×10 20 to 9.8×10 20 cm −3 . The zinc-oxide-based conductive stacked structure exhibits a change ratio in sheet resistivity of 50 or less, after bending of the stacked structure around a round bar having a diameter of 15 mm, with the transparent conductive film facing inward.

First claim

The invention claimed is:

1. A zinc-oxide-based conductive stacked structure comprising a substrate and, formed on at least one surface of the substrate, an undercoat layer and a transparent conductive film, wherein;
the transparent conductive film is formed of a plurality of transparent conductive layers formed from a zinc-oxide-based conductive material and has a carrier density of 2.0×10 20 to 9.8×10 20 cm −3 , and that
the zinc-oxide-based conductive stacked structure exhibits a change ratio in sheet resistivity of 50 or less, after bending of the stacked structure around a round bar having a diameter of 15 mm, with the transparent conductive film facing inward, wherein
each transparent conductive layer has a thickness of 50 nm or less, and
the zinc-oxide-based conductive stacked structure is obtained by forming, on the undercoat layer through ion plating, a plurality of transparent conductive layers formed from a zinc-oxide-based conductive material, to thereby form the transparent conductive film.

2. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the transparent conductive film has a thickness of 50 to 250 nm.

3. The zinc-oxide-based conductive stacked structure according to claim 1 ,
which exhibits an initial sheet resistivity R0 of 700 Ω/square or lower and which exhibits a first change ratio in sheet resistivity represented by T1=(R1−R0)/R0 of 1.0 or less and a second change ratio in sheet resistivity represented by T2=(R2−R0)/R0 of 4.0 or less,
wherein R1 represents sheet resistivity after the stacked structure has been placed under 60° C. conditions for seven days, and R2 represents sheet resistivity after the stacked structure has been placed under 60° C.-90% RH conditions for seven days.

4. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the zinc-oxide-based conductive stacked structure is formed by:
forming the undercoat layer on the substrate.

5. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein when forming the transparent conductive film, oxygen and argon are fed to a film-formation chamber at a ratio of oxygen gas flow rate to argon gas flow rate of 1:39 to 1:1.

6. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the substrate has a total light transmittance of 70% or higher and a haze of 10% or lower.

7. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the undercoat layer has a thickness of 0.01 to 20 μm.

8. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the transparent conductive film has a zinc oxide content of 85 mass % or higher.

9. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the transparent conductive film has 0.05 to 15 mass % of an additive selected from the group consisting of aluminum, gallium, boron, silicon, tin, indium, germanium, antimony, iridium, rhenium, cerium, zirconium, scandium, and yttrium.

10. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the transparent conductive film has a lattice constant of a c axis of 5.23 to 5.25 Å.

11. An electronic device comprising the zinc-oxide-based conductive stacked structure as recited in claim 1 .

12. A zinc-oxide-based conductive stacked structure comprising a substrate and, formed on at least one surface of the substrate, an undercoat layer and a transparent conductive film, wherein;
the transparent conductive film is formed of a plurality of transparent conductive layers formed from a zinc-oxide-based conductive material and has a carrier density of 2.0×10 20 to 9.8×10 20 cm −3 , and that
the zinc-oxide-based conductive stacked structure exhibits a change ratio in sheet resistivity of 50 or less, after bending of the stacked structure around a round bar having a diameter of 15 mm, with the transparent conductive film facing inward, wherein
each transparent conductive layer has a thickness of 50 nm or less,
the zinc-oxide-based conductive stacked structure is obtained by forming, on the undercoat layer through ion plating, a plurality of transparent conductive layers formed from a zinc-oxide-based conductive material, to thereby form the transparent conductive film, and
the transparent conductive film has a total light transmittance of 70% or higher and a haze of 10% or lower.

13. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein the transparent conductive film has a total light transmittance of 80% or higher and a haze of 5.2% or lower.

14. The zinc-oxide-based conductive stacked structure according to claim 1 , wherein each transparent conductive layer has a thickness of 30 nm or less.

Assignees

• Nagamoto Koichi
• Kondo Takeshi
• Amino Yumiko
• Naganawa Satoshi
• Yamamoto Tetsuya
• Yamada Takahiro
• Lintec Corp
• Univ Kochi Technology

Inventors

• Nagamoto Koichi
• Kondo Takeshi
• Amino Yumiko
• Naganawa Satoshi
• Yamamoto Tetsuya
• Yamada Takahiro

Classifications

• C08J7/0423

  with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• C23C14/086 Primary

  of zinc, germanium, cadmium, indium, tin, thallium or bismuth · CPC title

• C23C14/024

  Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence) · CPC title

• C08J2433/08

  Homopolymers or copolymers of acrylic acid esters · CPC title