KR101033304B1 - Light emitting organic photovoltaic cells and mathod of manufacturing the same - Google Patents

Abstract

An organic solar cell having a photoelectric conversion characteristic and a light emitting characteristic by introducing a polymer electrolyte layer instead of a buffer layer and a method of manufacturing the same are disclosed. The present invention relates to an organic solar cell in which a polymer electrolyte layer is introduced into a structure of a conventional solar cell to generate a current by photoelectric conversion in a state in which no voltage is applied from the outside, and when the voltage is applied from the outside. . In addition, the present invention relates to a method of manufacturing an organic solar cell having a luminescent property by introducing a polymer electrolyte layer between the first electrode and the photoactive layer. In addition, the present invention relates to a method of manufacturing an organic solar cell having light emitting characteristics, further comprising a protective layer between the photoactive layer and the second electrode in order to enhance durability of the solar cell.

Organic solar cell, polymer electrolyte layer, luminescence properties, protective layer

Description

Organic solar cell having luminescent properties and its manufacturing method {LIGHT EMITTING ORGANIC PHOTOVOLTAIC CELLS AND MATHOD OF MANUFACTURING THE SAME}

The present invention relates to an organic solar cell, and more particularly, to an organic solar cell having light emission characteristics in a state where a constant voltage is applied by introducing a polymer electrolyte layer.

Most of the commercially available solar cells are inorganic solar cells using silicon. Silicon solar cells have a high manufacturing price due to the process of manufacturing silicon, and the price of silicon materials is also on the rise as silicon demand increases in the semiconductor industry.

In order to overcome the shortcomings and limitations of such silicon solar cells, research on organic solar cells is being actively conducted. Unlike silicon solar cells, organic solar cells have a high absorption coefficient and can absorb sunlight even with a thin film (about 100 nm). Therefore, they can be manufactured as thin devices. The advantage is that the application is possible.

However, the conventional organic solar cell includes a substrate, a first electrode, a buffer layer, a photoactive layer, and a second electrode, and performs only a unique function of the solar cell generating current from light.

Currently, commercially available electronic devices are required for the convenience of portability due to economical efficiency and miniaturization that the same device in a product performs multifunction.

In particular, when a solar cell has a light emission characteristic when a voltage is applied in addition to an inherent function of generating electricity, smart display such as a portable electronic device may be possible.

However, solar cells having light emission characteristics have not been developed.

The present invention has been made to solve the above problems, an object of the present invention is to provide an organic solar cell having a photoelectric conversion characteristics and a polymer electrolyte layer is introduced in place of the buffer layer constituting the conventional solar cell.

Another object of the present invention is to provide an organic solar cell having light emission characteristics by introducing a polymer electrolyte layer instead of a buffer layer.

Another object of the present invention is to provide a manufacturing method for manufacturing an organic solar cell having a light emitting property by introducing a polymer electrolyte layer between the first electrode and the photoactive layer.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

An organic solar cell according to an embodiment of the present invention for achieving the above object is formed on a substrate, a first electrode formed on the substrate, a polymer electrolyte layer formed on the first electrode, the polymer electrolyte layer It characterized in that it comprises a photoactive layer and a second electrode formed on the photoactive layer. The photoactive layer may have light emission characteristics.

In addition, the organic solar cell according to another embodiment of the present invention is characterized in that it comprises a protective layer between the photoactive layer and the second electrode.

According to another aspect of the present invention, there is provided a method of manufacturing an organic solar cell, the method including: providing a substrate, followed by forming a first electrode on the substrate, and then using a polymer on the first electrode. Forming an electrolyte layer, followed by forming a photoactive layer on the polymer electrolyte layer, and finally forming a second electrode on the photoactive layer.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the organic solar cell of the present invention as described above has one or more of the following effects.

First, it is possible to manufacture a solar cell exhibiting a photoelectric conversion effect by introducing a polymer electrolyte layer instead of a buffer layer.

Second, by introducing a polymer electrolyte layer instead of a buffer layer it is possible to manufacture a solar cell having a light emitting property in the same device.

Third, by introducing a protective layer between the photoactive layer and the second electrode can not only protect the device from the external environment such as moisture or air, but also increase the efficiency of the organic solar cell.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and are common in the art to which the present invention pertains. It is provided to fully inform those skilled in the art of the scope of the invention, which is to be defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, an organic solar cell having light emission characteristics according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

1 is a view showing a laminated structure of an organic solar cell according to an embodiment of the present invention.

As shown in FIG. 1, an organic solar cell according to an exemplary embodiment of the present invention may include a substrate, a first electrode, a polymer electrolyte layer, a photoactive layer, and a second electrode.

The substrate 10 is used to support an organic solar cell and is a transparent glass substrate or a poly ethylene terephthlate (PET), a polyethersulphone (PES), a polycarbonate (PC), a polyimide (PI), a polyethylene naphthalate (PEN), and a polylate (PAR). Selected transparent plastic substrate can be used. But it is not limited thereto.

The first electrode 20 is preferably made of a transparent material such that light passing through the substrate 10 reaches the photoactive layer 40.

In addition, the first electrode 20 is made of a conductive material having a high work function and low resistance.

In this case, the material forming the first electrode 20 may be Al-doped Zinc Oxide (AZO), Indium Tin Oxide (ITO), Fluorine-doped Tin Oxide (FTO), Indium Zinc Oxide (IZO), or a mixture thereof. It may be selected from the group consisting of.

The polymer electrolyte layer 30 is formed on the first electrode 20, and has a structure of a conjugated polymer, which has a structure of a conjugated polymer, and thus has a characteristic of an electrolyte by causing a charge to the side chain.

The polymer electrolyte layer 30, in particular, the highest Occupied Molecular Orbital (HOMO) energy level of the polymer electrolyte main chain may be greater than the work function of the first electrode 20.

In addition, a low unoccupied molecular orbital (LUMO) energy level of the polymer electrolyte main chain is less than an energy level of LUMO of the photoactive layer 40, but an LUMO energy level of the photoactive layer 40 and LUMO energy of the polymer electrolyte layer 30. The difference between the levels may be such that electrons in the photoactive layer 40 do not move to the polymer electrolyte layer 30. In other words, the polymer electrolyte layer 30 may serve as an electronic blocking layer.

As a result, electrons accumulate in the photoactive layer 40 so that light emission can be made well.

In addition, when an electric field is applied between the first electrode 20 and the second electrode 50, for example, a positive voltage is applied to the first electrode 20 and a negative voltage is applied to the second electrode 50. When this is applied, the negative charge arranged adjacent to the first electrode 20 in the polymer electrolyte layer 30 can more easily inject holes from the first electrode 20 into the polymer electrolyte layer 30.

On the other hand, although positive charges are arranged adjacent to the photoactive layer 40 in the polymer electrolyte layer 30, due to the large difference in LUMO energy level between the photoactive layer 40 and the polymer electrolyte layer 30, Electrons may be difficult to enter the polymer electrolyte 30 layer.

The material used for the polymer electrolyte layer 30 is poly (9,9'-bis (6 ”-(N, N, N-trimethylammonium) hexyl) fluorene-alt-co-phenylene) bromide, poly ((2-cyclooctatetraenylethyl )-trimethylammonium trifluoromethanesulfonate), poly- (tetramethylammonium 2-cyclooctatetraenylethanesulfonate), poly ((2-methoxy-5- (3-sulfonatopropoxy) -1, 4-phenylene) -1,2-ethenediyl), with K as a counterion poly ((2-methoxy-5-propyloxysulfonate-1,4-phenylenevinylene) -alt- (1,4-phenylenevinylene)), sulfonated poly (p-phenylene) with H, Na, tetradecyltrimethylammonium (TDMA) as counterion, poly (N- (4-sulfonatobutyloxyphenyl) -4,4-diphenylamine-alt-1,4-phenylene) sodium salt, poly (N-4,4'-diphenylamine-alt-N- (p-trifluoromethyl) phenyl-4 , 4'-diphenylamine) sodium salt, poly ((9,9-bis (6 '-(N, N, Ntrimethylammonium) hexyl) -fluorene-2,7-diyl) -alt- (2,5-bis (pphenylene ) -1,3,4-oxadiazole)), PFP-Na (sodium poly (9,9'-bis (4-sulfonatobutyl) fluorene-alt-co-1,4-phenylene)) Can be.

However, the material is not limited to the above-described materials and may be used for the polymer electrolyte layer 30 as long as it is a solid polymer electrolyte.

The photoactive layer 40 is formed on the polymer electrolyte layer 30 and uses a semiconducting polymer and a fullerene derivative (fluorine derivatives) as a layer for generating light by separating light from electrons and holes.

The semiconducting polymer becomes an electron donor for absorbing light and gives electrons, and the fullerene derivative becomes an electron acceptor for receiving electrons from the semiconducting polymer.

The photoactive layer 40 according to the embodiment of the present invention has a bulk heterojunciton structure in which the electron donor-electron acceptor material is mixed and photoexcitation is caused by the difference in electron affinity at the electron donor-electron acceptor interface. Charge transfer is achieved.

More specifically, when the organic solar cell is exposed to light, an electron donor material absorbs light to form an electron-hole pair (exciton) in an excited state. The electron-hole pair diffuses in any direction and meets the electron donor-electron acceptor interface.

In this case, since the electron affinity of the electron acceptor material is greater than that of the electron donor material, electrons move toward the electron acceptor material having a high electron affinity, and holes remain in the electron donor material and are separated into respective charges.

Electrons and holes are collected and moved to the respective electrodes by the difference in concentration between the internal electric field and the accumulated charge formed by the work function difference between the anode and the cathode, and finally flow through the external circuit in the form of a current.

The photoactive layer 40 has a bulk heterojunction structure, and the electron donor and the electron acceptor form a photoexcitation charge-transfer interface at a nanoscale everywhere in the photoactive layer 40, thereby increasing the photocharge transfer interface. The photocharge transfer interface exists at a close distance from the electron-hole pair generated by light, and the electron-hole pairs can be effectively separated into electrons and holes.

Meanwhile, in the organic solar cell according to the present invention, when voltage is applied to the first and second electrodes 20 and 50, electrons are injected into the LUMO energy level of the photoactive layer 40 from the second electrode 50. The large LUMO energy level difference between the photoactive layer 40 and the polymer electrolyte layer 30 causes accumulation in the photoactive layer 40.

In addition, holes injected from the first electrode 20 are easily transferred to the polymer electrolyte layer 30 by negative charges arranged adjacent to the first electrode 20 in the polymer electrolyte layer 30. As a result, in the photoactive layer 40 exhibits light emission characteristics by recombination between electrons and holes.

Electron donors are P3HT (poly (3-hexylthiophene)), MEH-PPV (poly- [2-methoxy-5- (2'-ethylhexyloxy) -1,4-phenylene vinylene]), MDMO-PPV ( poly [2-methoxy-5-3 (3 ', 7'-dimethyloctyloxy) -1-4-phenylene vinylene]), PFDTBT (poly ((2,7- (9,9-dioctyl) -fluorene) -alt- 5,5- (4 ', 7'-di-2-thienyl-2', 1 ', 3'-benzothiadiazole), PCPDTBT (poly [N-9'-heptadecanyl-2,7-carbazole-alt-5) , 5- (4 ', 7'-di-2-thienyl-2', 1 ', 3'-benzothiadiazole)]), PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5 , 5- (4 ', 7'-di-2-thienyl-2', 1 ', 3'-benzothiadiazole)]), but is not limited to the above materials.

Also, the electron acceptor is suitable for a material having a high electron affinity compared to the electron donor, and includes fullerene (C ₆₀ ), fullerene derivatives, polybenzimidazole (PBI), PTCBI (3,4, 9,10 perylenetetracarboxylic bisbenzimidazole). The fullerene derivative may be PC ₆₀ BM ([6,6] -phenyl-C ₆₁ butyric acid methyl ester) or PC ₇₀ BM ([6,6] -phenyl-C ₇₁ butyric acid methyl ester). However, it is not limited to these substances.

The organic solar cell according to the embodiment of the present invention is a PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7) as an electron donor material in the photoactive layer 40. '-Di-2-thienyl-2', 1 ', 3'-benzothiadiazole)]), PC ₇₀ BM ([6,6] -phenyl-C ₇₁ butyric acid methyl ester) is used as the electron acceptor.

In this case, the mixing weight ratio of PCDTBT and PC ₇₀ BM is preferably 1: 4.

The thickness of the photoactive layer 40 is preferably thin for diffusion of excitons generated by irradiation of light to the conductive polymer, but should be at least 20 nm or more to absorb more sunlight, preferably 20 to 200 nm. Has a thickness of.

The second electrode 50 is disposed to face the first electrode 20, and a material having a low work function is used.

The material forming the second electrode 50 includes, but is not necessarily limited to, a metal such as Al, Ca, Mg, K, Ti, Li, or an alloy thereof.

The difference in work function between the first electrode 20 and the second electrode 50 forms an electric field to transfer the separated charges.

The protective layer 60 is interposed between the photoactive layer 40 and the second electrode 50 to prevent degradation of the device due to penetration of oxygen or water vapor into the photoactive layer 40.

In addition, by introducing the protective layer 60, the amount of light introduced into the photoactive layer 40 can be increased to increase the efficiency of the organic solar cell.

The material of the protective layer 60 is titanium oxide (TiOx) is used and is formed by the sol-gel (sol-gel) method. In this case, the protective layer 60 has a thickness of 2 to 50 nm.

According to another aspect of the present invention, there is provided a method of manufacturing an organic solar cell, which includes first providing a substrate, then forming a first electrode, then forming a polymer electrolyte layer, and then forming a photoactive layer. It can be configured to include forming two electrodes.

In the providing of the substrate 10, a transparent glass substrate, a plastic substrate, or the like may be used to transmit external light and exhibit light emission characteristics.

The forming of the first electrode 20 is to form a conductive material on the substrate 10, and according to an embodiment of the present invention, an anode is formed on the substrate 10.

In this case, the positive electrode material is made of tin oxide (SnO ₂ ), AZO (Al-doped Zinc Oxide), Indium Tin Oxide (ITO), Fluorine-doped Tin Oxide (FTO), and Indium Zinc Oxide (IZO). It can be any one selected.

The first electrode 20 may be formed by thermal evaporation, e-beam evaporation, RF (radio frequency) sputtering, or magnetron sputtering. But it is not limited thereto.

In the forming of the polymer electrolyte layer 30, the main chain has a structure of a conjugated polymer on the first electrode 20 to form a polymer material having charge on the side chain.

The polymer electrolyte layer 30 according to an embodiment of the present invention is composed of PFP-Na (sodium poly (9,9'-bis (4-sulfonatobutyl) fluorene-alt-co-1,4-phenylene)).

The polymer electrolyte is water-soluble and is formed on the first electrode 20 after being dissolved in a solvent in which methanol (40%), isopropanol (40%) and water (20%) are mixed.

In this case, the method of forming the polymer electrolyte layer 30 may include spin coating, dip coating, ink-jet printing, spray coating, It can be formed by any one method selected from screen printing, drop casting, stamp method, doctor blade, roll-to-roll.

The thickness of the polymer electrolyte layer 30 is characterized in that 1 ~ 150nm.

In addition, the polymer electrolyte layer 30 formed on the first electrode 20 is heat-treated at 60-120 ° C. for 10 minutes to 1 hour in an oxygen atmosphere.

In the forming of the photoactive layer 40, the semiconducting polymer and the fullerene derivative are mixed on the polymer electrolyte layer 30 to form a bulk heterojunction.

In this case, the photoactive layer 40 is formed on the polymer electrolyte layer 30 after dissolving the semiconducting polymer and the fullerene derivative in an organic solvent such as chlorobenzene, dichlorobenzene, chloroform and toluene.

The photoactive layer 40 is formed by spin coating, dip coating, ink-jet printing, spray coating, and screen printing a solution in which a semiconductor polymer and a fullerene derivative are dissolved together. It can be formed by any one method selected from screen printing, drop casting, stamp method, doctor blade, roll-to-roll.

In this case, the photoactive layer 40 has a bulk heterojunction structure and the thickness of the photoactive layer 40 is 20-200 nm for sufficient light absorption.

The protective layer 60 may be disposed between the photoactive layer 40 and the second electrode 50, and serves to secure durability of the device by blocking the inflow of air or moisture during operation of the organic solar cell.

The protective layer 60 according to the embodiment of the present invention is composed of titanium oxide (TiOx) and sol- using Titanium (IV) isopropanol, 2-methoxyethanol, and ethanolamine. It synthesize | combines by the gel (sol-gel) method.

In addition, in order to prevent the reaction of titanium (Ti) with oxygen in the process of sol-gel (sol-gel) synthesis reaction is produced in a nitrogen atmosphere.

The titanium oxide precursor sol prepared by the above method forms titanium oxide (TiO _x ) by hydrolysis at room temperature.

The formation of the protective layer 60 may be performed by spin coating, dip coating, ink-jet printing, screen printing, doctor blade, and titanium oxide (TiOx) solution. ), Drop casting, stamp method or roll-to-roll printing and the like.

The forming of the second electrode 50 is to form a conductive material on the photoactive layer 40, and according to one embodiment of the present invention, a cathode is formed on the photoactive layer 40.

The second electrode 50 may be formed by thermal evaporation, e-beam evaporation, radio frequency (RF) sputtering or magnetron sputtering. But it is not limited thereto.

Hereinafter, an experimental example (example) for preparing a conventional solar cell (comparative example) and the present invention (manufacturing example) will be presented to help understanding of the present invention. However, the following experimental examples are only for helping understanding of the present invention, and the present invention is not limited to the following experimental examples.

Conventional Solar Cells (Comparative Example)

Depositing ITO (Indium Tin Oxide) as a first electrode on a transparent plastic substrate and spin coating a buffer layer of PEDOT: PSS (Poly (3,4-ethylenedioxylene thiphene) -polystyrene sulphonic acid) onto the first electrode It was formed by the method.

Then, PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7′-di-2-thienyl-2 ′, 1 ′, 3 ′) on the buffer layer -benzothiadiazole)]) and PC ₇₀ BM ([6,6] -phenyl-C ₇₁ butyric acid methyl ester) were formed by spin coating. Finally, Al, a second electrode, was deposited on the photoactive layer.

<Invention (manufacturing example)>

ITO (Indium Tin Oxide) is deposited on the transparent plastic substrate and conjugated polymer PFP-Na (sodium poly (9,9'-bis (4-sulfonatobutyl) fluorene-alt-co-1,4-phenylene) )) Was dissolved in a solvent mixed with methanol (40%), isopropanol (40%) and water (20%) to prepare a polymer electrolyte solution.

PFP-Na dissolved in the solvent was formed on the first electrode by spin coating, and then heat-treated at 110 ° C. for 10 minutes in an oxygen atmosphere.

Then, PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7′-di-2-thienyl-2 ′, 1 ′, 3) on the polymer electrolyte layer '-Benzothiadiazole)]) and PC ₇₀ BM ([6,6] -phenyl-C ₇₁ butyric acid methyl ester) were blended to form a photoactive layer by spin coating. Finally, Al, a second electrode, was deposited on the photoactive layer.

2 is a molecular structure of PFP-Na (sodium poly [9,9'-bis (4-sulfonatobutyl) fluorene-alt-co-1,4-phenylene]) which is one of the polymer electrolytes according to one embodiment of the present invention The figure which shows.

FIG. 3 is a view showing fluorescence and electroluminescence characteristics according to the wavelength change of the polymer electrolyte composed of PFP-Na shown in FIG. 2.

4 is a view showing a voltage-current change between a conventional organic solar cell and an organic solar cell (LESC) according to an embodiment of the present invention.

As shown in FIG. 4, when the conventional organic solar cell and the organic solar cell including the polymer electrolyte layer according to the present invention are irradiated with light corresponding to the solar spectrum of Air Mass (AM) 1.5 100 mW, the voltage-current is almost equivalent. Characteristics As an example, it can be seen that the energy conversion efficiency (energy conversion efficiency is about 4.9%).

5 is a view showing the voltage-current-brightness characteristics of a conventional solar cell.

When the constant voltage is applied as shown in Figure 5 it can be seen that the conventional solar cell is not observed at all.

6 is a view showing the voltage-current-brightness characteristics of the organic solar cell according to an embodiment of the present invention.

As shown in Figure 6 it can be seen that the organic solar cell according to an embodiment of the present invention exhibits light emission characteristics when a constant voltage is applied.

7 is a view showing an electroluminescence spectrum of an organic solar cell according to an embodiment of the present invention.

8 is a photograph showing an electroluminescence phenomenon of an organic solar cell according to an embodiment of the present invention.

9 is a diagram showing an energy band diagram of an organic solar cell incorporating a polymer electrolyte layer according to an embodiment of the present invention.

9 is PFP-Na (Sodium poly [9,9'-bis (4-sulonatobutyl) fluorene-co-alt-1,4-phenylene]), and the conjugated polymer is PCDTBT (poly [N-9]. ′ -Heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7′-di-2-thienyl-2 ′, 1 ′, 3′-benzothiadiazole)]), and the fullerene derivative is PC ₇₀ BM ( [6,6] -phenyl-C ₇₁ -butyric acid methyl ester).

10 is a view showing a change in the electroluminescence spectrum when the thickness of the polymer electrolyte layer is 20 nm as an organic solar cell according to an embodiment of the present invention.

11 is a view showing a change in electroluminescence spectrum when the thickness of the polymer electrolyte layer as an organic solar cell according to an embodiment of the present invention is 35nm.

As shown in FIGS. 10 and 11, it can be seen that the light emission peak appears at about 1.9 eV when the thickness of the polymer electrolyte layer is 20 nm. This corresponds to the LUMO and HOMO energy difference of the electron donor material of the photoactive layer, it can be seen that the emission mainly occurs in the photoactive layer.

On the other hand, when the thickness of the polymer electrolyte layer is thick, such as 35nm, it can be seen that the emission peak appears at about 3.2eV, about 1.9eV, about 2.2eV. Since 2.2 eV corresponds to the energy difference between the LUMO of the electron donor material of the photoactive layer and the HOMO of the polymer electrolyte, this may be explained by light emission by exciplex generated by holes of the polymer electrolyte and electrons of the conjugated polymer.

In addition, since 3.2 eV corresponds to the energy difference between LUMO and HOMO of the polymer electrolyte, light emission may occur in the polymer electrolyte layer.

As described above, according to the present invention, a polymer electrolyte layer is introduced in place of a buffer layer in the structure of a conventional organic solar cell, thereby making it possible to manufacture a device having light emission characteristics without changing the characteristics of the conventional solar cell.

In addition, it may be possible to control the color of the light emitted by controlling the thickness of the polymer electrolyte layer provided in the organic solar cell according to the present invention and the energy gap of the material used as the photoactive layer.

The optoelectronic device according to the present invention can be applied to the entire industry in which polymer light emitting diodes are currently used, and can be used throughout the ubiquitous system where portability is emphasized because power can be produced by itself.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

1 is a view showing a laminated structure of an organic solar cell according to an embodiment of the present invention.

2 is a diagram showing the molecular structure of PFP-Na constituting the polymer electrolyte layer according to an embodiment of the present invention.

3 is a view showing fluorescence and electroluminescence characteristics according to the wavelength change of the polymer electrolyte composed of PFP-Na shown in FIG.

4 is a view showing a voltage-current change between a conventional organic solar cell and an organic solar cell (LESC) according to an embodiment of the present invention.

5 is a view showing the voltage-current-brightness characteristics of the conventional organic solar cell.

6 is a view showing the voltage-current-brightness characteristics of the organic solar cell according to an embodiment of the present invention.

7 is a view showing an electroluminescence spectrum of an organic solar cell according to an embodiment of the present invention.

8 is a photograph showing an electroluminescence phenomenon of an organic solar cell according to an embodiment of the present invention.

9 is a diagram showing an energy band diagram of an organic solar cell according to an embodiment of the present invention.

10 is a view showing a change in the electroluminescence spectrum when the thickness of the polymer electrolyte layer as the organic solar cell according to an embodiment of the present invention 20nm.

11 is a view showing a change in electroluminescence spectrum when the thickness of the polymer electrolyte layer as an organic solar cell according to an embodiment of the present invention is 35nm.

<Description of Symbols for Main Parts of Drawings>

10 substrate 20 first electrode

30 polymer electrolyte layer 40 photoactive layer

50: second electrode 60: protective layer

Claims (15)

Board; A first electrode formed on the substrate; A polymer electrolyte layer formed on the first electrode; A photo active layer formed on the polymer electrolyte layer; And A second electrode formed on the photoactive layer, The photoactive layer is an organic solar cell exhibiting light emission characteristics by a voltage applied from the outside through the first electrode and the second electrode. delete The method of claim 1, An organic solar cell comprising a protective layer between the photoactive layer and the second electrode. The organic solar cell of claim 3, wherein the protective layer is made of titanium oxide (TiOx). The method of claim 1, wherein the polymer electrolyte layer, poly (9,9-bis (6 ”-(N, N, N-trimethylammonium) hexyl) fluorene-alt-co-phenylene) bromide, poly ((2-cyclooctatetraenylethyl)-trimethylammonium trifluoromethanesulfonate), poly- (tetramethylammonium 2- cyclooctatetraenylethanesulfonate), poly ((2-methoxy-5- (3-sulfonatopropoxy) -1, 4-phenylene) -1,2-ethenediyl), poly ((2-methoxy-5-propyloxysulfonate-1) with a counterion of K , 4-phenylenevinylene) -alt- (1,4-phenylenevinylene)), sulfonated poly (p-phenylene), poly (N- (4-sulfonatobutyloxyphenyl) -4, having H, Na, tetradecyltrimethylammonium (TDMA) as counterion 4'-diphenylamine-alt-1,4-phenylene) sodium salt, poly (N-4,4'-diphenylamine-alt-N- (p-trifluoromethyl) phenyl-4,4'-diphenylamine) sodium salt, poly ( (9,9-bis (6 '-(N, N, Ntrimethylammonium) hexyl) -fluorene-2,7-diyl) -alt- (2,5-bis (pphenylene) -1,3,4-oxadiazole)) , PFP-Na (sodium poly (9,9'-bis (4-sulfonatobutyl) fluorene-alt-co-1,4-phenylene)) an organic solar cell, characterized in that made of at least one material. The method of claim 1, wherein the photoactive layer, An organic solar cell comprising a bulk heterojunction structure between an electron donor material and an electron acceptor material. The method of claim 6, wherein the electron donor material, Poly (3-hexylthiophene) (P3HT), MEH-PPV (poly- [2-methoxy-5- (2'-ethylhexyloxy) -1,4-phenylene vinylene]), MDMO-PPV (poly [2-methoxy-5) -3 (3 ', 7'-dimethyloctyloxy) -1-4-phenylene vinylene]), PFDTBT (poly ((2,7- (9,9-dioctyl) -fluorene) -alt-5,5- (4' , 7'-di-2-thienyl-2 ', 1', 3'-benzothiadiazole), PCPDTBT (poly [N-9'-heptadecanyl-2,7-carbazole-alt-5,5- (4 ', 7'-di-2-thienyl-2 ', 1', 3'-benzothiadiazole)]), PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7′-di-2-thienyl-2 ′, 1 ′, 3′-benzothiadiazole)]). The method of claim 6, wherein the electron acceptor material, An organic solar cell comprising at least one of a fullerene (C ₆₀ ), a fullerene derivative, a polybenzimidazole (PBI), and a PTCBI (3,4,9,10 perylenetetracarboxylic bisbenzimidazole). The method of claim 7, wherein the electron donor material is PCDTBT (poly [N-9′-heptadecanyl-2,7-carbazole-alt-5,5- (4 ′, 7′-di-2-thienyl-2 ′, 1 ', 3'-benzothiadiazole)]). The organic solar cell of claim 8, wherein the electron acceptor material is PC ₇₀ BM ([6,6] -phenyl-C ₇₁ butyric acid methyl ester). Providing a substrate; Forming a first electrode on the substrate; Forming a polymer electrolyte layer on the first electrode; Forming a photoactive layer on the polymer electrolyte layer; And Forming a second electrode on the photoactive layer; The photoactive layer is an organic solar cell manufacturing method exhibiting the light emission characteristics by the voltage applied from the outside through the first electrode and the second electrode. delete The method of claim 11, Forming a protective layer between the step of forming the photoactive layer and the step of forming the second electrode. The method of claim 11, wherein the forming of the polymer electrolyte layer, Spin coating, dip coating, ink-jet printing, spray coating, screen printing, drop casting Method of manufacturing an organic solar cell, characterized in that formed by any one of a method, a stamp method, a doctor blade or a roll-to-roll. The method of claim 13, wherein forming the protective layer, Titanium oxide (TiOx) solution is spin coated, dip coated, ink-jet printing, screen printing, doctor blade, drop casting Method of manufacturing an organic solar cell, characterized in that made by any one of a method, a stamp method or roll-to-roll printing.

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