KR102517343B1 - Transparent electrode, the same manufacturing apparatus and method - Google Patents

Abstract

Two or more types of wires formed of different lengths; A resin layer applied to two or more types of wires to form a plane; and a PET (Polyethylene terephthalate) layer coated on the plane of the resin layer, wherein two or more types of wires are arranged in a web form to secure a converter; and a second wire arranged in a space between the first wires, wherein the first wire is formed to be longer than the second wire, and a transparent electrode is provided.

Description

Transparent electrode, device and method for manufacturing a transparent electrode {TRANSPARENT ELECTRODE, THE SAME MANUFACTURING APPARATUS AND METHOD}

The present invention relates to a transparent electrode and an apparatus and method for manufacturing the transparent electrode.

In general, carbon nanotubes are produced only through electrospinning. Electrospinning is based on the mathematical calculation that electrostatic force can overcome surface tension when a liquid falls. All polymer materials that can be melted and mixed in a solvent can be used. , is a technology that can easily manufacture micrometer to nanometer diameter wires using an electric field.

In normal electrospinning, electrospinning is performed while moving a jet for spinning a spinning solution in one direction on a prepreg. As a result, a composite material in which electrospinning is performed on prepreg can be obtained, and a multi-layer composite material can be obtained by repeatedly performing and stacking the prepreg. Although a unidirectional composite can be obtained through general electrospinning as described above, since such a unidirectional composite has high mechanical properties only for a specific angle at which the polymer wire is oriented, it is a bidirectional composite that exhibits high mechanical properties for various angles. Composites were required. FIG. 4 is a schematic diagram showing conventional bidirectional electrospinning. As shown in FIG. 4, the conventional bidirectional electrospinning includes a first jet moving in one direction on a prepreg and a second jet moving in a different direction on a prepreg. It was done using a jet.

However, in order to manufacture the above-mentioned bidirectional composite material in the prior art, not only do multiple jets are required according to the orientation angle during electrospinning, but also electrospinning according to different orientation angles must proceed sequentially, so the time required for electrospinning There was a technical problem that the degree increases according to the number of different orientation angles.

Republic of Korea Patent Publication No. 10-2016-0140260 (2016. 12. 07)

An object of one embodiment of the present invention is to provide a transparent electrode in which transparency is increased and electrical resistance is reduced through wires composed of a plurality of sizes by spinning wires on a multi-scale.

An object of one embodiment of the present invention is to provide an apparatus for manufacturing a transparent electrode having increased transparency and reduced electrical resistance through wires composed of a plurality of sizes by spinning wires on a multi-scale.

An object of one embodiment of the present invention is to provide a method for manufacturing a transparent electrode having increased transparency and reduced electrical resistance through wires composed of a plurality of sizes by spinning wires on a multi-scale.

Embodiments of the present invention are to provide a transparent electrode having excellent performance in terms of current density, luminescence rate and power efficiency when compared to transparent electrodes having the same transparency and sheet resistance.

In addition, embodiments of the present invention are to provide a method for manufacturing a transparent electrode having excellent performance in terms of current density, luminescence rate and power efficiency when compared to transparent electrodes having the same transparency and sheet resistance.

In addition, embodiments of the present invention are to provide an organic light emitting diode using a transparent electrode manufactured using a dual-scale silver nanowire.

In addition, embodiments of the present invention are to provide a method for manufacturing an organic light emitting diode using a transparent electrode manufactured using a dual-scale silver nanowire.

In addition, the organic light emitting diode including the manufactured transparent electrode is to be provided to a mobile phone and tablet panel, and a solar cell having a semiconductor structure.

Two or more types of wires formed of different lengths; A resin layer applied to two or more types of wires to form a plane; and a PET (Polyethylene terephthalate) layer coated on the plane of the resin layer, wherein two or more types of wires are arranged in a web form to secure a converter; and a second wire arranged in a space between the first wires, wherein the first wire is formed to be longer than the second wire, and a transparent electrode is provided.

Also, the first wire may have a length of 100 to 120 micrometers.

Also, the first wire may have a length of 100 nanometers.

Also, the second wire may have a length of 20 to 30 micrometers.

Also, the second wire may have a width of 40 nanometers.

Also, the first wire and the second wire may be silver nanowires.

a radiation unit that emits two or more types of wires on a substrate; a first coating unit for forming a resin layer by applying resin to two or more kinds of wires spun by the radiation unit; and a second coating unit for forming a PET layer on the resin layer formed by the first coating unit, wherein the radiation unit emits first and second wires having different sizes, and the first wire is An apparatus for manufacturing a transparent electrode, which is radiated to be longer than the second wire, is provided.

In addition, by applying the resin by the first coating unit, different stacking heights between the wires spun on the substrate may be flattened.

In addition, the radiation unit radiates wires in the horizontal and vertical directions for the substrate, but the number of times the first wire and the second wire are spun may be 5:1.

In addition, the number of individuals of the first wire and the second wire may be 5:1 to 2:1.

In addition, a laser patterning unit for performing laser ablation patterning may be further included.

Also, the first wire and the second wire may be silver nanowires.

A first wire is radiated to the substrate, a second wire shorter than the first wire is radiated to the substrate, a resin is applied on the substrate on which the first wire and the second wire are spun, to form a resin layer, and a resin layer is formed on the resin layer. The PET layer may be coated, and the first wire, the second wire, the resin layer, and the PET layer may be separated from the substrate.

In addition, the first wire and the second wire may be ablated with a laser by the laser patterning unit between the processes of irradiating the second wire and applying the resin.

In addition, by applying the resin, a positional difference in the height direction of the first wire and the second wire accumulated from the substrate may be compensated to be flattened.

Also, the first wire and the second wire may be silver nanowires.

An embodiment of the present invention may provide a transparent electrode having increased transparency and reduced electrical resistance through wires composed of a plurality of sizes by spinning wires on a multi-scale.

One embodiment of the present invention may provide an apparatus for manufacturing a transparent electrode having increased transparency and reduced electrical resistance through wires composed of a plurality of sizes by spinning wires on a multi-scale.

An embodiment of the present invention may provide a method of manufacturing a transparent electrode having increased transparency and reduced electrical resistance through wires composed of a plurality of sizes by spinning wires on a multi-scale.

A transparent electrode according to an embodiment of the present invention is a transparent electrode using a dual-scale silver nano wire, and may have better performance compared to a silver nano wire transparent electrode having a single standard when manufactured as an organic light emitting diode.

A transparent electrode according to an embodiment of the present invention is a transparent electrode using a dual-scale silver nanowire, and compared to a transparent electrode having the same transparency and sheet resistance, electrical properties that determine organic light emitting diode performance such as current density, luminescence rate, and power efficiency characteristics are improved.

In addition, the organic light emitting diode including the manufactured transparent electrode can be employed in cell phones and tablet panels, and solar cells having a semiconductor structure.

1 is a diagram showing a spinning step of a wire according to an embodiment of the present invention;
2 is an enlarged view of a portion where a wire is radiated according to an embodiment of the present invention;
3 is a side cross-sectional view of a transparent electrode according to an embodiment of the present invention;
4 is a view showing an example of a wire cross section according to an embodiment of the present invention;
5 is a diagram showing a radial direction of a wire on a substrate according to an embodiment of the present invention;
6 is a view showing a process of manufacturing a transparent electrode according to an embodiment of the present invention;
7 is a diagram showing transparency for each wavelength of a display to which a transparent electrode according to an embodiment of the present invention is applied;
8 is a view showing the characteristics of each condition of a first wire, a second wire, and each transparent electrode including the first wire and the second wire according to an embodiment of the present invention;
9 is a flowchart illustrating a method of manufacturing a transparent electrode according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is only an example and the present invention is not limited thereto.

In describing the present invention, if it is determined that a detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following examples are only one means for efficiently explaining the technical spirit of the present invention to those skilled in the art to which the present invention belongs.

In the present invention, which will be described below, the radiated wire may be a conductive wire, and a wire made of silver nanowires can be described as an example.

1 is a view showing a spinning step of a wire according to an embodiment of the present invention.

Referring to FIG. 1 , wires 110 and 120 may be spun on a substrate, and a plurality of types of wires may be spun. Here, when a plurality of types are classified according to various sizes and a group of wires having a certain regularity is referred to as one type, different types of wires may be spun. In order to explain the present invention, the wires will be described by functionally dividing them into a first wire 110 and a second wire 120 . Of course, since the first wire 110 and the second wire 120 are essential elements for carrying out the present invention, they are described as examples, and the functions to be described below, such as a third wire not shown, can be further subdivided and applied. .

The first wire 110 and the second wire 120 may have different sizes. Here, the size is a length, and one of the two may be formed longer. Of course, the width of the cross section may be formed to be larger. There is a difference in shape, and functions according to the shape may be formed differently in each transparent electrode to be manufactured. As shown in FIG. 1(c), the first wire 110 and the second wire 120 may be radiated to the substrate 10. For example, the first wire 110 may be first spun on the substrate 10, and then the second wire 120 may be spun sequentially.

The first wire 110 is a wire formed longer than the second wire 120, and may be arranged to perform a function of spreading a conductive area by connection due to contact with each other so that current can flow over a wide area on a substrate. there is. At this time, the arrangement may be arranged horizontally and vertically with respect to one surface of the substrate 10 and may be crossed. The second wire 120 may be radiated in the empty space between the first wires 110 formed at this time.

When only the first wire 110 is radiated as shown in FIG. 1 (a), the surface capable of emitting light may be reduced when applied to a surface light emitting body due to the formation of the empty space. On the other hand, when only the second wire 120 is radiated as shown in FIG. 1 (b), a wire having a smaller size than the first wire 110 is radiated over the entire area, and only the first wire 110 has the same transparency. Although it may be increased compared to the case where the number of objects is radiated, more junctions, which are points where each wire is crossed, may be formed than when only the first wire 110 is radiated. The occurrence of the intersection may cause an increase in electrical resistance.

The present invention can compensate for the disadvantages and apply only the advantages when the first wire 110 and the second wire 120 are respectively radiated. That is, the first wire 110 having a larger scale can be radiated to secure a conductive area so that current can be transmitted, and the second wire 120 is radiated in the empty space between the first wires 110. The decrease in transparency can be improved.

In this case, the first wire 110 may have a length of 100 to 120 micrometers and a width of 100 nanometers. This is of course disclosed as an example, but is not limited thereto. Also, in the case of the second wire 120, the length may be 20 to 30 micrometers, and the width may be 40 nanometers. In addition, the population ratio of each of the first wire 110 and the second wire 120 may be 5:1 to 2:1. Of course, conductive and light-emitting surfaces exist even out of the above ratio, but efficiency may be reduced.

As the number of individuals of the first wire 110 increases, the sensitivity or the light emitting area may decrease, and as the number of individuals of the second wire 120 increases, the increase in resistance may increase. Of course, when the second wire 120 has a relatively high population ratio, resistance increases, but conductivity can be maintained.

As described above, by mixing and emitting the first wire 110 and the second wire 110, current plane diffusion (conductivity) and securing of the light emitting area can be expected. 2 is an enlarged view of a portion where a wire is radiated according to an embodiment of the present invention. Referring to FIG. 2, as a photograph of the wire described in FIG. 1, FIG. 1 (a) and FIG. 2 (a) correspond, FIG. 1 (b) and FIG. 2 (b) correspond, and FIG. 1 (c) may correspond to FIG. 2(c).

A transparent electrode according to an embodiment of the present invention may be applied to organic light emitting diode (OLED). Through the above-described transparent electrode, which is an embodiment of the present invention applied to OLED, a wider light emitting area, increased conductivity (current surface diffusion), and low resistance can be expected. This reduces performance (light emitting area, conductivity, resistance, etc.) in order to configure a wire body (eg, displays; OLED) including only one wire of the first wire 110 and the second wire 120. By mixing and spinning the first wire 110 and the second wire 120, the strengths of the respective wires 110 and 120 can complement each other.

Meanwhile, FIG. 1 may be a diagram showing the roughness of a transparent electrode according to an embodiment of the present invention. The more protruding from the surface, the brighter the color. In the case of a dual scale, which is a scale including the first wire 110 and the second wire 120, the roughness difference is smaller across the electrodes than the transparent electrode using the first wire 110 and the second wire 120, respectively. It can be confirmed that

3 is a side cross-sectional view of a transparent electrode according to an embodiment of the present invention, and FIG. 4 is a view showing an example of a cross-section of a wire thread according to an embodiment of the present invention.

Referring to FIG. 3, wires of different scales are radiated, so that when another wire is placed on top of the wire, a junction occurs, and the height from the substrate 10 may be different depending on the size of the two wires. . Resin may be applied by an amount equal to or greater than the height of the wire located at the highest level among them. By applying the resin, the accumulated height difference between the different wires spun can be compensated.

The resin layer 130 may be formed in a planar shape, and the PET layer 140 may be coated on the surface of the resin layer 130 . By compensating for the height difference, the PET layer 140 can be positioned flat. Furthermore, the base material 10 positioned at the bottom may be peeled off from layers other than the base material 10 . That is, the transparent electrode may function as a transparent electrode when the substrate 10 is separated in the illustrated configuration.

The transparent electrode receives, for example, a pressure or approach signal from the PET layer 140, and conduction may be performed by the “first wire 110” or “the first wire 110 and the second wire 120”. . Compensation for the height difference may be particularly important when the transparent electrode is formed as a flat surface when employed in a display. In the process of curing to be flattened by application of the resin, height compensation (R) between the highest portion of the accumulated wires and the wires located at a lower height in the periphery may be performed. The accumulated wires include a case where a plurality of first wires 110 are accumulated, a case where a plurality of second wires 120 are accumulated, and a case where the first wire 110 and the second wire 120 are mixed and accumulated. There may be.

The application of the resin for the height compensation (R) may be applied from the base material 10 to a height equal to or higher than the highest portion. That is, the resin layer 130 may be formed as a flat surface by curing the resin, and may be cured in a state in which wires accumulated on the substrate 10 are buried. Here, the resin may be a UV curing resin. Furthermore, the buried wire can be prevented from oxidation by avoiding exposure to air. Of course, after the substrate 10 is peeled off, a portion of the wire at the bottom contacting the substrate 10 is exposed to the outside and can conduct conduction through contact with a power source.

4 is a view showing an example of a wire cross section according to an embodiment of the present invention.

Referring to FIG. 4 , the first wire 110 and the second wire 120 may have circular or polygonal cross sections. The wire radiated as described above may have a circular cross section or, more precisely, a pentagonal cross section of a polygon. The shape of this cross section is formed by a mechanism in which wire yarns are seeded, and in the present invention, it is close to a pentagon, but it can be various shapes. In addition, the width of the above-described first wire 110 and the second wire 120 means the length in the horizontal direction shown in Figs. 4 (a) and 4 (b). That is, in the case of a diameter, it is the diameter, and in the case of a polygon, it means the longest distance inside the polygon.

5 is a view showing a radial direction of a wire on a substrate 10 according to an embodiment of the present invention.

Referring to FIG. 5 , wires may be radiated on the substrate 10 by a radiation unit ( 210 in FIG. 6 ) in a first radiation direction XS and a second radiation direction YS. Here, the first radiation direction XS and the second radiation direction YS do not refer to specific directions, but rather directions that cross each other. Further, if the directions intersect with each other, it may be a curved direction instead of a straight line direction. That is, although the illustrated example is displayed such that the horizontal direction and the vertical direction are orthogonal to each other, this is to indicate that a junction occurs as wires radiating from crossing each other are accumulated.

Specifically, in the radiation of the wire, the first wire 110 is preferentially radiated in one of the first radiation direction (XS) and the second radiation direction (YS), and in the other direction crossing the first wire 110. The second wire 120 may be cumulatively radiated. Here, by radiating the first wire 110, a junction where the wires cross occurs, and the junction can increase resistance. Subsequently, the spun second wire 120 may be spun into a mesh-shaped empty space formed by crossing the first wire 110 . That is, the second wire 120 formed on a smaller scale is positioned in the empty space to secure transparency of the transparent electrode, and the first wire 110 secures conductivity of the transparent electrode with low resistance in a larger area. there is.

And when radiation in the first radiation direction (XS) and the second radiation direction (YS) is radiated once each, when it is referred to as one-time radiation, the first wire 110 and the second wire 120 are 5: 1 to 1 It can be formed in a ratio of 2:1. In addition, the population may be formed in a ratio of 1:5 to 1:2.

6 is a view showing a process of manufacturing a transparent electrode according to an embodiment of the present invention.

Referring to FIG. 6 , an apparatus for manufacturing a transparent electrode includes a radiation part 210 , a first coating part 220 and a second coating part 230 . Here, the radiation unit 210 may be a nozzle type that performs electrospinning, or may be a type that spins wires during translational motion through a Meyer rod. The radiation unit 210 may emit the first wire 110 and the second wire 120 . The first wire 110 may be formed larger in size than the second wire 120 . The size is a concept including length, and may additionally include a concept including diameter.

The radiation unit 210 repeatedly moves and radiates the longer first wires 110 in two directions so as to cross each other, and the second wire 120 is formed between the mesh wire layers formed by the first wires 110. can be radiated while moving in two intersecting directions. Thus, when the wire spinning is completed, the resin layer 130 may be formed by applying resin.

Here, application of the resin may be performed by the first coating unit 220 . The first coating unit 220 functions to flatten while compensating for the different height differences by applying a resin when wires are accumulated by multiple times of wire spinning and the heights of the accumulated wires are different from the substrate 10, respectively. can Also, while forming the resin layer 130 , mechanical strengthening may be increased. Such mechanical strength may be, for example, strength such as elasticity or bending strength of the flexible electrode when the transparent electrode is employed for the flexible electrode. In addition, corrosion can be prevented or delayed by performing a function of preventing oxidation of the first wire 110 and the second wire 120 buried in the resin during the planarization process.

When the resin layer 130 is coated by the first coating unit 220 , an additional layer such as a PET layer 140 may be coated on the formed resin layer 130 by the second coating unit 230 . The additional layer may be the PET layer 140 described above, or may include one or more of materials such as LiF/Al, TPBi, CBP, and TAPC.

7 is a diagram showing transparency for each wavelength of a display to which a transparent electrode according to an embodiment of the present invention is applied.

Referring to FIG. 7, according to the wavelength of the transmitted signal, a transparent electrode in which only the first wire 110 is radiated, a transparent electrode in which only the second wire 120 is radiated, and the first wire 110 and the second wire 120 The transparent electrodes to which the mixed radiation has different transparency. Among them, the transparent electrode in which only the first wire 110 is radiated shows the highest transparency, and when the wavelength range is 400 to 700 nm, when the wavelength is low, the first wire 110 and the second wire The transparent electrode in which (120) is mixed is radiated has higher transparency than the transparent electrode in which only the second wire 120 is radiated. As the wavelength increases, the transparent electrode in which only the second wire 120 is radiated has higher transparency than the transparent electrode in which the first wire 110 and the second wire 120 are mixed and radiated.

From these results, it can be seen that the transparent electrode in which only the first wire 110 is radiated has the highest transparency, and the number of junctions may be small because the number of wires is small. Thus, it is possible to manufacture a transparent electrode recording low resistance. Since the light emitting area is reduced when the transparent electrode functions as a surface light emitting body, the second wire 120 may be radiated to increase the light emitting area. When the second wire 120 is mixed and radiated with the first wire 110, since the number of objects is greater than that of the first wire 110, the current diffusion surface is increased due to the radiation of the first wire 110 and the second wire 120 ), it is possible to secure the light emitting area.

8 shows the characteristics of each condition of the first wire 110, the second wire 120, and each transparent electrode including the first wire 110 and the second wire 120 according to an embodiment of the present invention. is the drawing shown.

Referring to FIG. 8(a) , it is possible to check the amount of current per area (left vertical axis) and luminance (right vertical axis) versus voltage (horizontal axis). According to this graph showing the experimental results, in the case of a transparent electrode in which the first wire 110 and the second wire 120 are mixed-radiated (dual-scale), as the voltage increases, the current amount and luminance per area tend to increase. The increasing trend is greater than that of the transparent electrode including only the first wire 110 or the transparent electrode including only the second wire 120.

In the case of the transparent electrode including only the first wire 110, the amount of current increases as the voltage increases, but when it is formed in a lattice form, since an empty space is formed, the current diffusion surface is relatively narrow and light cannot be emitted in the empty space, so the luminance There may be limits.

In the case of the transparent electrode including only the second wire 120, although the amount of current increases as the voltage increases, since the number of objects is greater than that of the first wire 110, the resistance increases due to the increase in the junction due to cumulative radiation. will increase

Referring to FIG. 8(b), the power efficiency (vertical axis) compared to the luminance (horizontal axis) was generally the highest in the transparent electrode including the first wire 110 and the second wire 120, and as the luminance increased, Although the power efficiency tends to decrease, it can be seen that the highest power efficiency is continuously maintained from the low luminance area (less than 10 cd/m²) to the high luminance area (more than 1000 cd/m²).

Referring to FIG. 8(c), it is possible to check the luminous efficiency (left vertical axis) and current efficiency (right vertical axis) versus the amount of current per area (horizontal axis). The case where the first wire 110 and the second wire 120 are mixed and radiated in order to spread the current plane and secure the light emitting area shows the best results. This result may be due to the reason that the current plane diffusion is possible in the case of the transparent electrode including only the first wire 110, but the light emitting area is not secured, and in the case of the transparent electrode including only the second wire 120, the light emitting area is It is secured, but it may be because the current plane diffusion is difficult.

9 is a flowchart illustrating a method of manufacturing a transparent electrode according to an embodiment of the present invention.

Referring to FIG. 9 , the transparent electrode may include first wire spinning (S1), second wire spinning (S2), UV laser treatment (S3), resin coating (S4), and PET coating (S5). Here, the UV laser treatment (S3) process is not an essential process, and the first wire 110 and the second wire 120 are processed from the base material 10 through laser etching, ablation, etc. It may be an optional process of machining a shape into a predetermined shape.

The first wire spinning (S1) step is a step of spinning the first wire 110, and by spinning the first wire 110 having a longer length than the second wire 120, the current diffusion surface is formed on the substrate 10. can be secured Subsequently, a second wire spinning (S2) step may be performed. A current diffusion surface is secured and the second wire 120 is radiated in the empty space between the radiated first wires 110 so that a junction with the first wire 110 is formed, and the first wire 110 The light emitting area in the empty space between the first wire 110 may be formed with a smaller number of objects and a larger size than the second wire 120 .

Here, the first wire 110 is a step of dissolving ethylene glycol, polyvinylpyrrolidone, and AgNO3 in an Erlenmeyer flask, quickly injecting CuCl22H2O and stirring, and generating Ag nanowires by heating the solution in a heated silicone oil bath. It can be prepared including steps.

Preferably, the weight average molecular mass (Mw) of polyvinylpyrrolidone may be about 360,000, and 30 to 90 mL, more preferably 40 to 60 mL of ethylene glycol, 0.2 to 0.6 g, and more preferably 0.3 to 0.5 g of Polyvinylpyrrolidone and 0.3 to 0.7 g, more preferably 0.4 to 0.6 g of AgNO 3 can be dissolved, and a magnetic stirring bar can be used in the dissolving step.

In addition, in the step of stirring after injecting CuCl22H2O, 600 to 1000 μL, preferably 700 to 900 μL may be added, and the stirring time may be 30 seconds to 1 minute and 30 seconds, preferably about 1 minute.

In the step of generating nanowires by bathing in hot water, the silicone oil bath may be 110 to 150 ° C, preferably 120 to 140 ° C, more preferably about 130 ° C, and the time to grow the nano wires is 1 to 5 hours, preferably It can be done in 2 to 4 hours.

The generated first wire 110 may have an average diameter of 80 to 120 nm, preferably 90 to 110 nm, and more preferably about 100 nm. Also, the average length may be 80 to 120 μm, preferably 90 to 110 μm, and more preferably 100 μm.

In addition, the first wire 110 and the second wire 120 may be radiated in two directions intersecting each other by the translational movement of a meyer rod. Specifically, assuming that the radiation is radiated in the two intersecting directions as being radiated once, when the first wire 110 is radiated 5 times, the second wire may be radiated once. That is, as an example, the first wire 110 and the second wire 120 may form a radiation count ratio of 5:1, and the radiation count ratio may be formed within a range of 5:1 to 2:1. there is. Further, the wires 110 and 120 to be radiated may have a circular or polygonal (particularly, pentagonal) cross-section, and may be wires containing silver nano. As a specific example, it may be silver nanowires (AgNWs) or indium tin oxide (ITO).

Here, the second nanowire 120 is formed by dissolving polyvinyl pyrrolidone having a weight average molecular weight of 360,000 and polyvinylpyrrolidone having a weight average molecular weight of 40,000 in a glycerol solvent in a silicone oil bath, adding purified water in which AgNO3 can be dissolved, It may include adding glycerol containing NaCl and generating nanowires by heating in a silicone oil bath.

Preferably, in the step of melting polyvinyl pyrrolidone, the mass ratio of polyvinyl pyrrolidone having a weight average molecular weight of 360,000 and polyvinyl pyrrolidone having a weight average molecular weight of 40,000 may be dissolved in the range of 1:5 and 1:3, and more preferably at about 1:4 ratio. can melt Also, a stir bar can be used when bathing in a silicone oil bath.

In the step of adding purified water, AgNO3 may be dissolved in 400 to 800 μL, preferably 500 to 700 μL of purified water, and 0.1 to 0.5 g of AgNO3, preferably 0.2 to 0.4 g of AgNO3 may be added.

In the step of adding glycerol, the amount of glycerol containing 0.0064 to 0.0087 g of NaCl, preferably 0.0070 to 0.0080 g of NaCl may be 3 to 7 mL, preferably 4 to 6 mL.

In the step of generating the nanowires 110 and 120 by hot water, the silicone oil bath may be 110 to 150 ° C, preferably 120 to 140 ° C, more preferably about 130 ° C, and the nanowire growing time is 1 to 5 hours, preferably 2 to 4 hours.

After manufacturing the first wire 110 and the second wire 120 by the above method, ethanol/methanol is added and stirred, and then returned to a centrifuge to separate the nanowires to remove remaining organisms. In the method, the centrifuge is It can be used for 5 to 15 minutes, preferably 8 to 12 minutes, more preferably about 10 minutes, and the speed can be used at a speed of 2500 to 3500 rpm, preferably 2750 to 3250 rpm, and more preferably 3000 rpm.

The generated second wire 120 may have an average diameter of 20 to 60 nm, preferably 30 to 50 nm, and more preferably about 40 nm. Also, the average length may be 2.5 to 17.5 μm, preferably 5 to 15 μm, and more preferably 10 μm.

In addition, the above steps may be repeated several times, and the above steps ?? The obtained silver nanowires may be washed and then placed in an ethanol solution.

When the silver nanowires are immersed in the ethanol solution, the ethanol solution may be 0.05 to 0.35 wt%, preferably 0.1 to 0.3 wt%, and more preferably about 0.2 wt%.

In the step of transferring the dual-scale silver nanowires to the substrate by bar-coating, a Meyer bar can be used, and the ratio of long silver nanowires and thin silver nanowires can be adjusted by adjusting the number of coatings using the Meyer bar. can

In the step of patterning the silver nanowires, patterning in a desired shape may be possible by using a pulse wave laser in the UV range, and after applying a UV curable solution, the PET substrate may be brought into contact with and separated from the PET substrate. At this time, a flattened flexible transparent electrode can be manufactured with a structure in which silver nanowires are buried in a curable solution.

After that, an organic light emitting diode can be formed using vacuum equipment, and a transparent conductor, a hole injection layer, a hole transport layer, an emissive layer, and an electron transport layer Transport Layer), Electron Injection Layer, and Top Electrode are stacked in this order. Specifically, it can be manufactured by sequentially stacking AgNW, TAPC:MoO3, TAPC, CBP:Ir(ppy)3, TPBi, LiF and Al. In addition, organic light emitting diodes can be used in cell phones and tablet panels, and can also be used in solar cells having a semiconductor structure.

The resin coating (S4) process may include a function of preventing oxidation of the wires 110 and 120 of the manufactured transparent electrode, a function of increasing mechanical strength, and a purpose of flattening during manufacturing.

Specifically, the anti-oxidation function prevents oxidation of exposed portions of the wires 110 and 120 in the air by the substrate 10 to be peeled off in the manufacturing process. At this time, the exposed wires 110 and 120 may be the first wire 110 and the first wire 110 spun on the substrate 10, and the resin is cured by applying the resin to form the resin layer 130. When formed, it may be positioned inside the resin layer 130 . That is, it is possible to prevent oxidation of many of the wires 110 and 120 by blocking contact with air. Of course, some of the wires 110 and 120 (parts that have come into contact with the substrate) are exposed on the surface side of the resin layer, creating a condition in which a current connecting an external power supply can flow.

In addition, the mechanical strengthening function of the resin layer 130 means that the resin is applied after the wires 110 and 120 are spun, so that after the resin is cured, the mechanical strength such as elasticity or bending strength is further increased. do. The resin applied here may be a UV curing resin.

In addition, flattening at the time of manufacturing may allow one surface of the resin layer 130 to form a flat surface after the applied resin is cured so that an additional coating layer is positioned on the one surface to make the surface flat. When the transparent electrode is applied to a display or the like, planarization may be performed so that an additional layer stacked on the resin layer 130, such as the PET layer 140, can be stacked flat. Such a flat surface may be a factor affecting display quality.

The flattening is performed by setting the height direction position of the accumulation wire lower than the reference of the highest accumulation wire at different height direction positions of the accumulated wires 110 and 120 in the process of spinning the spun wires 110 and 120, at least It means that the resin is cured after being applied to a thickness that is more than compensated for. For example, the resin may be a UV curing resin.

The PET coating (S5) step is a layer additionally stacked on the flattened resin layer 130, and one or more of materials such as LiF/Al, TPBi, CBP, and TAPC as well as PET may be selectively included.

Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

10: materials
110: 1st wire
120: second wire
130: resin layer
140: PET layer
210: radiation unit
220: first coating unit
230: second coating unit
R: compensation height
W: width
XS: 1st radial direction
YS: 2nd radial direction
S1: 1st wire radiation
S2: 2nd wire radiation
S3: UV laser treatment
S4: Resin coating
S5: PET coating

Claims (16)

Two or more types of wires formed of different lengths;
a resin layer applied to the two or more types of wires to form a plane; and
A polyethylene terephthalate (PET) layer coated on the plane of the resin layer;
The above two or more types of wire,
A first wire arranged in a web form to secure a converter; and
Including; a second wire arranged in the space between the first wire,
Wherein the first wire is formed longer than the second wire, the transparent electrode.
The method of claim 1,
The first wire is a transparent electrode having a length of 100 to 120 micrometers.
The method of claim 1,
The first wire is a transparent electrode having a length of 100 nanometers.
The method of claim 1,
The second wire is a transparent electrode having a length of 20 to 30 micrometers.
The method of claim 1,
The second wire is a transparent electrode having a width of 40 nanometers.
The method of claim 1,
Wherein the first wire and the second wire are silver nanowires, the transparent electrode.
a radiation unit that emits two or more types of wires on a substrate;
a first coating unit for forming a resin layer by applying resin to two or more kinds of wires spun by the radiation unit; and
And a second coating unit for forming a PET layer on the resin layer formed by the first coating unit,
The radiation part,
A device for manufacturing a transparent electrode, wherein a first wire and a second wire having different sizes are radiated, and the first wire is radiated to be longer than the second wire.
The method of claim 7,
By applying the resin by the first coating unit, different stacking heights between the wires spun on the substrate are flattened, the apparatus for manufacturing a transparent electrode.
The method of claim 7,
The radiation unit emits the wire in the horizontal and vertical directions for the substrate, and the number of times of spinning of the first wire and the second wire is 5: 1, a device for manufacturing a transparent electrode.
The method of claim 7,
The first wire and the number of population of the second wire is 5: 1 to 2: 1, the device for producing a transparent electrode.
The method of claim 7,
An apparatus for manufacturing a transparent electrode, further comprising a laser patterning unit that performs laser ablation patterning.
The method of claim 7,
Wherein the first wire and the second wire are silver nanowires, a device for manufacturing a transparent electrode.
Radiating a first wire to the substrate,
Radiating a second wire shorter than the first wire to the substrate,
Forming a resin layer by applying a resin on the substrate on which the first wire and the second wire are spun;
Coating a PET layer on the resin layer,
A method of manufacturing a transparent electrode by separating the first wire, the second wire, the resin layer and the PET layer from the substrate.
The method of claim 13,
The method of manufacturing a transparent electrode, wherein the first wire and the second wire are ablated with a laser by a laser patterning unit between the process of irradiating the second wire and applying the resin.
The method of claim 13,
By applying the resin, the positional difference between the first wire and the second wire in the height direction accumulated from the substrate is compensated to be flattened.
The method of claim 13,
Wherein the first wire and the second wire are silver nanowires, a method for manufacturing a transparent electrode.

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