Population of metal oxide nanosheets, preparation method thereof, and electrical conductor and electronic device including the same

Patent metadata

Field	Value
Publication number	US-10993320-B2
Application number	US-201916704305-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Nov 6, 2015
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

An electrical conductor includes a substrate; and a first conductive layer disposed on the substrate and including a plurality of metal oxide nanosheets, wherein adjacent metal oxide nanosheets of the plurality of metal oxide nanosheets contact to provide an electrically conductive path between the contacting metal oxide nanosheets, wherein the plurality of metal oxide nanosheets include an oxide of Re, V, Os, Ru, Ta, Ir, Nb, W, Ga, Mo, In, Cr, Rh, Mn, Co, Fe, or a combination thereof, and wherein the metal oxide nanosheets of the plurality of metal oxide nanosheets have an average lateral dimension of greater than or equal to about 1.1 micrometers. Also an electronic device including the electrical conductor, and a method of preparing the electrical conductor.

First claim

What is claimed is:

1. An electronic device comprising:
a substrate having a first surface and a second surface opposite to the first surface;
a first conductive layer having a third surface and a fourth surface opposite to the third surface and comprising a plurality of layered metal oxide nanosheets, the first conductive layer being disposed on the substrate so that the third surface of the first conductive layer faces the first surface of the substrate; and
a second conductive layer disposed on the substrate and comprising an electrically conductive metal nanowire,
wherein adjacent metal oxide nanosheets of the plurality of metal oxide nanosheets contact to provide an electrically conductive path between the contacting metal oxide nanosheets,
wherein the metal oxide nanosheets of the plurality of metal oxide nanosheets comprise an oxide of Re, Os, Ru, Ta, Ir, W, Ga, Mo, In, Cr, Rh, Mn, Co, Fe, or a combination thereof, and
wherein the plurality of metal oxide nanosheets have an average lateral dimension of greater than or equal to about 1.1 micrometers, and
wherein the first conductive layer has a sheet resistance of less than or equal to about 33000 ohms per square.

2. The electronic device of claim 1 , wherein the metal oxide nanosheets of the plurality of metal oxide nanosheets have an average lateral dimension of greater than or equal to about 1.5 micrometers and an average thickness of less than or equal to about 5 nanometers.

3. The electronic device of claim 1 , wherein the first conductive layer is a discontinuous layer including an open space between metal oxide nanosheets of the plurality of metal oxide nanosheets, and
wherein an area of the open space is less than about 50% of an area of the first conductive layer.

4. The electronic device of claim 1 , wherein the first conductive layer has a light transmittance of about 93% or greater.

5. The electronic device of claim 1 , wherein the first conductive layer has a sheet resistance of less than or equal to about 15000 ohms per square and has a light transmittance of about 93% or greater.

6. The electronic device of claim 1 , wherein the metal oxide nanosheets of the plurality of metal oxide nanosheets comprise ruthenium oxide, manganese oxide, cobalt oxide, iron oxide, rhenium oxide, iridium oxide, indium oxide, or a combination thereof.

7. The electronic device of claim 1 , wherein the plurality of metal oxide nanosheets comprises RuO 2+x wherein 0≤x≤0.5, MnO 2 , Mn 3 O 7 , Mn 1−x Co x O 2 wherein 0<x≤0.4, CoO 2 , FeO 2 , ReO 2 , IrO 2 , InO 2 , or a combination thereof.

8. The electronic device of claim 1 , wherein the second conductive layer is disposed between the substrate and the first conductive layer.

9. The electronic device of claim 1 , wherein the second conductive layer is disposed on the fourth surface of the first conductive layer.

10. The electronic device of claim 1 , wherein the electrically conductive metal nanowire comprises silver, copper, gold, aluminum, cobalt, palladium, or a combination thereof.

11. The electronic device of claim 1 , wherein the conductive metal nanowire has an average diameter of less than or equal to about 50 nanometers and an average length of greater than or equal to about 1 micrometer.

12. The electronic device of claim 1 , wherein the electronic device has transmittance of greater than or equal to about 85% at a wavelength of 550 nanometers and sheet resistance of less than or equal to about 100 ohms per square.

13. The electronic device of claim 1 , further comprising an overcoating layer comprising a thermosetting resin, an ultraviolet curable resin, or a combination thereof directly on the first conductive layer.

14. The electronic device of claim 1 , wherein the electronic device is a flat panel display, a touch screen panel, a solar cell, an e-window, an electrochromic mirror, a heat mirror, a transparent transistor, or a flexible display.

15. The electronic device of claim 1 , wherein the substrate is transparent and flexible.

16. The electronic device of claim 1 , wherein the metal oxide nanosheets of the plurality of metal oxide nanosheets comprise ruthenium oxide.

17. The electronic device of claim 1 , wherein the plurality of metal oxide nanosheets comprises RuO 2+x wherein 0≤x≤0.5.

18. The electronic device of claim 12 , wherein the first conductive layer is a discontinuous layer including an open space between metal oxide nanosheets of the plurality of metal oxide nanosheets, and
wherein an area of the open space is less than about 50% of an area of the first conductive layer.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Jung Doh Won
• Kim Se Yun
• Roh Jong Wook
• Lee Jongmin
• Hwang Sungwoo
• Hwang Jinyoung
• Kwak Chan

Classifications

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01G55/004

  Oxides; Hydroxides · CPC title

• Y10S977/896

  Chemical synthesis, e.g. chemical bonding or breaking · CPC title

• C01P2006/40

  Electric properties · CPC title

• Y10S977/932

  for electronic or optoelectronic application · CPC title