JP2016207438A - Transparent conductive electrode film and use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive film excellent in conductivity, durability or transparency and a solar cell panel or an LED panel using the same.SOLUTION: There are provided: a transparent conductive electrode film A where many conductive metal wires X-1 are arranged in parallel as pattern on a surface of the transparent film A and further silver nano wire (AgNW) is dispersively applied with network-like on the surface; and a solar cell panel and an LED panel containing the electrode film as a substance.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transparent conductive electrode film and use thereof. For more details,
Transparent conductive electrode film in which a large number of conductive metal wires are arranged in parallel and in a pattern, solar cell panel and LED using this electrode film as a base material
Regarding panels.

Transparent conductive electrode films are members of electronic and communication devices that are widely used in liquid crystal films, mobile phones, car navigation systems, game machines, smartphones, tablet terminals, touch panels, and the like. As the amount of this electrode film increases, the importance of improving and improving its properties has increased.
This electrode film is currently a composite film (hereinafter referred to as “ITO film”) in which an ITO (indium tin oxide) film is formed on the film.
Although ITO films are increasingly used due to their excellent properties, their use has some technical problems. One of them is that it is difficult to increase the size and use it in specific fields. Therefore, the development of other conductive films to replace ITO films has been proposed. For example, an electrode film has been proposed in which a number of conductive metal wires are arranged in parallel and patterned on the surface of a transparent film. Since this electrode film is much more conductive than the ITO film, it is suitable for use in the field of large-sized electronic / communication equipment.

The present inventor has described an electrode film in which a large number of the above-described conductive metal wires are arranged in parallel and in a pattern (hereinafter may be abbreviated as “metal wire arrayed electrode film”) as a solar cell. Research progressed for use in panels and LED panels. Therefore, research was conducted on improving the conductivity and other characteristics of metal wire array electrode films.
As a result, it was found that when silver nanowires (AgNW) were dispersed and coated on the surface of the metal wire array electrode film, the electrical conductivity characteristics were further improved and the optical characteristics were sufficiently maintained.

The present invention has been achieved based on such investigation facts, and according to the present invention, the following electrode film, solar cell panel and LED panel are provided.
(1) Many conductive metal wires are parallel and patterned on the surface of the transparent film.
An electrode film arranged on the surface of the electrode film;
(AgNW) is dispersed and applied in the form of a mesh.
Polar film.
(2) The plurality of conductive metal wires are formed in parallel at intervals of 1.0 to 3 mm,
The conductive metal wire has a width of 1 to 10 μm, and each conductive metal wire is adjacent to 2 to 6 wires.
Forms a set of conductive lines to form a number of conductive lines, and each conductive line is
In each set, the conductive metal wires are electrically connected to each other.
The transparent conductive electrode frame according to the above (1), in which a reticulated pattern is formed by
Film.
(3) The transparent conductive electrode according to (1), wherein the conductive metal wire is a copper (Cu) wire.
the film.
(4) The silver nanowires (AgNW) are entangled with each other on the surface of the transparent film.
The transparent conductive electrode frame according to the above (1), which forms a mated network structure
Film.
(5) The transparent conductive film according to (1), wherein the transparent film is a PET film.
Polar film.
(6) The transparent conductive electrode fill according to (1), wherein the total light transmittance is 60 to 93%.
Mu.
(7) Solar cell panel comprising the transparent conductive electrode film according to (1) as a base material
Le.
(8) An LED panel comprising the transparent conductive electrode film according to (1) as a base material.

The transparent conductive electrode film of the present invention is excellent in conductivity, has electrical properties with improved conductivity efficiency, and has good optical properties, and can be used in various fields as an electrode film. It can be advantageously used particularly in the field of large equipment. In particular, it has great industrial value as an electrode film substrate for solar cell panels and LED panels.

In the electrode film of the present invention, one of the preferred embodiments of the electrode film in which a large number of conductive metal wires are arranged in parallel and patterned before silver nanowires (AgNW) are dispersedly coated on the surface. Is schematically shown. A partially enlarged view of a state in which silver nanowires (AgNW) are arranged in a mesh pattern on an electrode film on which conductive metal wires are arranged in a pattern is schematically shown. The pattern array is omitted.

In the electrode film of the present invention, a number of conductive metal wires are arranged in parallel and patterned on one side of a transparent film. The transparent film may be a resin film that has excellent transparency, and examples thereof include a polyester film, a polycarbonate film, a polyolefin film, and a polycycloolefin film, and preferably a polyester film. It is a film. In particular,
Polyethylene terephthalate (PET) film, or polyethylene-2.6-
Naphthalate (PEN) films are preferred, and polyethylene terephthalate (PET) films are particularly preferred. These transparent films may be either unstretched or stretched, and the thickness is suitably 50 to 300 μm.
Most preferably, it is 80-250 micrometers.

In the electrode film of the present invention, a large number of fine conductive metal wires are arranged in parallel and patterned on one side of the transparent film. Preferably, a large number of conductive metal wires are arranged in parallel at regular intervals. Are arranged. A preferred embodiment in which a number of conductive metal wires are arranged in parallel and patterned is shown in FIG. In FIG. 1, (A)
Is a transparent film, and a large number of conductive metal wires are formed in parallel in the horizontal direction in the drawing. A large number of conductive metal wires are adjacent to each other in a group of 2 to 6, preferably 3 to 5 to form one conductive line. In FIG. 1, three conductive metal lines are combined to form one conductive line. A set of conductive lines is indicated by X-1, X-2, X-3, X-4... Xn.
Each set of conductive lines forms a netted pattern of conductive metal lines so that the conductive metal lines are electrically connected to each other. That is,
In FIG. 1, the conductive metal wires that are meshed are indicated by dotted lines for the sake of explanation. Hereinafter, the conductive metal wire indicated by the dotted line may be abbreviated as “reticulated wire”. In FIG. 1, the meshed lines are formed in a perpendicular direction so as to form a ladder shape with respect to a large number of parallel metal lines. However, although it is preferable that the meshed line is perpendicular to the parallel and straight metal line, it is not always necessary. It may be reticulated at a certain angle. The only requirement is that the reticulated lines are in each set (conductive line) and the metal lines forming the set are mutually connected. It is essential that they are electrically connected to form one conductive line, and it is important that one set is not electrically connected to the other set. That is, there is no reticulated line between sets.

The reticulated wires within each set function to maintain the electrical connection of each set of conductive lines if the conductive metal wires are partially or locally damaged or broken. ing. The number of reticulated wires is 1 to 5 wires, preferably 2 to 5 wires per set with respect to 10 mm in the length direction of the conductive metal wires.
The conductive metal wire desirably has a width of 1 to 10 μm, preferably 2 to 8 μm,
The thickness is advantageously 0.1-5 μm, preferably 0.1-4 μm.
In addition, the width and thickness of the reticulated line are selected from the same range as that of the conductive metal line.
For the conductive metal wire and the meshed wire, a conductive metal material is used, specifically, Cu,
Examples thereof include Ni, AL (aluminum), Ag, Cr, alloys composed of two or more of these metals, or those formed by a multilayer structure of these metals. Of these, Cu and Ag are preferable, and Cu is particularly advantageous in terms of workability and cost.

The electrode film consists of 2 to 6 conductive metal wires as one set to form one conductive line (X-1, X-2, X-3, X-4... Xn). ing. It is desirable that the number of conductive metal wires in each group is the same. In FIG. 1, three conductive metal wires are 1
It is a pair. The distance between the conductive metal wires in each set (distance between the center line and the center line) is 1.0 to 3 mm, preferably 1.5 to 2.5 mm, and they are arranged linearly in parallel. The distance between the conductive metal lines is preferably equal within the above range.
The number of conductive metal wires in each group is preferably the same, and the distance between the conductive metal wires in each group is preferably the same value. However, it is desirable that the distance between the sets is 1.5 to 10 mm, preferably 2 to 8 mm, and the distance between the sets is equal.

The conductive metal wire and the reticulated wire can be formed on one side of the transparent film by photoresist processing or photoetching processing. For the conductive metal wires formed on the surface of the transparent film, the interval between the metal wires in the set and the interval between the sets is the same value (equal intervals). And advantageous in terms of utilization and control.
The transparent conductive electrode film of the present invention is a surface of an electrode film (hereinafter sometimes referred to as “substrate electrode film”) in which the above-described conductive metal wires are arranged in parallel and patterned. In addition, silver nanowires (AgNW) are dispersed and applied in a mesh shape.

Silver nanowire (AgNW) is a wire shape having a high aspect ratio formed from an ink of nanosize particles (several tens to several hundreds nm) of silver (Ag), and is commercially available from Cambrios (USA). It is what has been. Silver nanowires are entangled with each other on the surface of a transparent film to form a network structure. Silver nanowires are resistant to bending, have excellent transparency, and achieve high conductivity.

The transparent conductive electrode film of the present invention is obtained by applying silver nanowires on the substrate electrode film by the method described above. The obtained electrode film has good transparency and a total light transmittance of 60 to 93%, preferably 65 to 91%.
Thus, since the electrode film of the present invention is excellent in conductivity, transparency, durability and flexibility, it can be advantageously used as an electrode film for solar cells and an electrode film for LED panels. .

(A); Transparent film X-1; Conductive line
Y: Silver nanowire

Claims (8)

An electrode film in which a large number of conductive metal wires are arranged in parallel and patterned on the surface of a transparent film, and silver nanowires (AgNW) are further dispersed and applied on the surface of the transparent film. A transparent conductive electrode film.
The plurality of conductive metal wires are formed in parallel at intervals of 1.0 to 3 mm, each conductive metal wire has a width of 1 to 10 μm, and each conductive metal wire has 2 to 6 adjacent wires. A plurality of conductive lines are formed as a set of conductive lines, and each conductive line forms a netted pattern of conductive metal lines so that the conductive metal lines are electrically connected to each other in each set. The transparent conductive electrode film according to claim 1.
The transparent conductive electrode film according to claim 1, wherein the conductive metal wire is a copper (Cu) wire.
The transparent conductive electrode film according to claim 1, wherein the silver nanowire (AgNW) forms a network structure intertwined with each other on the surface of the transparent film.
The transparent conductive electrode film according to claim 1, wherein the transparent film is a PET film.
The transparent conductive electrode film according to claim 1, wherein the total light transmittance is 60 to 93%.
A solar cell panel comprising the transparent conductive electrode film according to claim 1 as a substrate.
      The LED panel which contains the transparent conductive electrode film of Claim 1 as a base material.

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