KR20160067340A - Organic photovoltaic cell and method for manufacturing the same - Google Patents

Abstract

The present invention relates to an organic solar cell and a manufacturing method thereof. The organic solar cell comprises: a cathode; an anode; a photoactive layer; and an electron transport layer.

Description

≪ Desc / Clms Page number 1 > ORGANIC PHOTOVOLTAIC CELL AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to an organic solar cell and a method of manufacturing the same.

Research on renewable and clean alternative energy sources such as solar energy, wind power, and hydro power is actively being conducted to solve the global environmental problems caused by depletion of fossil energy and its use. Among these, there is a great interest in solar cells that change electric energy directly from sunlight. Here, a solar cell refers to a cell that generates a current-voltage by utilizing a photovoltaic effect that absorbs light energy from sunlight to generate electrons and holes.

Solar cells are devices that can convert solar energy directly into electrical energy by applying a photovoltaic effect. Solar cells can be divided into inorganic solar cells and organic solar cells depending on the material constituting the thin film.

Many researches have been conducted to improve the energy conversion efficiency of solar cells through various layers and electrodes according to their design.

US 5331183 US 5454880

An object of the present invention is to provide an organic solar cell.

The present disclosure includes a cathode; An anode disposed opposite to the cathode; A photoactive layer disposed between the cathode and the anode; And an electron transport layer provided between the cathode and the photoactive layer,

The electron transport layer provides an organic solar cell comprising an oxidized non-conjugated polyelectrolyte.

The present disclosure also provides a method of manufacturing a semiconductor device, comprising: preparing a substrate; Forming a cathode electrode on the substrate; Forming an electron transport layer on the cathode electrode; Forming a photoactive layer on the electron transporting layer; And forming an anode electrode on the photoactive layer,

Wherein the electron transport layer comprises an oxidized non-conjugated polyelectrolyte.

The organic solar cell according to one embodiment of the present invention can use a photoactive layer of various materials. Further, it is possible to provide a high efficiency organic solar cell.

In addition, the organic solar cell according to one embodiment of the present invention can provide an organic solar cell having an excellent lifetime.

1 shows an organic solar cell according to one embodiment.
FIG. 2 shows the observation of the color change of the non-conjugated polyelectrolyte and the oxidized non-conjugated polymer electrolyte.
3 is an example of comparison of absorption spectra of the non-conjugated polyelectrolyte and oxidized non-conjugated polymer electrolyte.

Hereinafter, the present invention will be described in more detail.

When a member is referred to herein as being "on " another member, it includes not only a member in contact with another member but also another member between the two members.

Whenever a component is referred to as "comprising ", it is to be understood that the component may include other components as well, without departing from the scope of the present invention.

The present disclosure relates to a fuel cell including a cathode; An anode disposed opposite to the cathode; A photoactive layer disposed between the cathode and the anode; And an electron transport layer provided between the cathode and the photoactive layer,

The electron transport layer provides an organic solar cell comprising an oxidized non-conjugated polyelectrolyte.

The non-conjugated polyelectrolyte in the present specification refers to a polymer that does not contain a conjugated group but contains an electrolyte group as a repeating unit. The non-conjugated polymer electrolyte includes a salt having an electric charge separated from an anion and a cation in an aqueous solution salt.

In this specification, the electron transport layer containing the oxidized non-conjugated polyelectrolyte is provided in contact with the cathode. In this case, the oxidized non-conjugated polyelectrolyte forms a thin film of several nanometers by the dipole moment to change the work function of the cathode.

The organic solar cell including the oxidized non-conjugated polyelectrolyte according to one embodiment of the present invention can use an electron donor material that could not be applied in the case where the non-conjugated polymer electrolyte, which has not been oxidized in the prior art, is used, The material of the organic solar battery can be easily controlled according to the method of the present invention, and the high efficiency of the organic solar battery can be expected.

Conventional organic solar cells use a non-conjugated polyelectrolyte (NPE) as an electron transporting layer. Since the non-conjugated polyelectrolyte is a nonconductive material, the work function of the cathode can be changed without interfering with the current flow by forming an ultra thin film of 1 nm to 2 nm. However, conventionally, there has been an uneconomical problem in time and / or cost due to the formation of an ultra thin film.

In addition, when the oxidized non-conjugated polymer electrolyte is included, the work function of the cathode can be modified without interfering with the current flow even if the thickness of the ultra-thin film is greater than that of the ultra-thin film, .

In addition, ultraviolet rays in an organic solar cell are factors that hinder the life of the photoactive layer. The oxidized non-conjugated polyelectrolyte according to one embodiment of the present invention absorbs ultraviolet rays, and thus has an advantageous effect on the lifetime of the organic solar battery.

3 is an example of comparison of absorption spectra of the non-conjugated polyelectrolyte and oxidized non-conjugated polymer electrolyte. 3, it can be seen that the oxidized non-conjugated polyelectrolyte absorbs ultraviolet rays, which is advantageous in the lifetime of the photoactive layer.

FIG. 2 shows the observation of the color change of the non-conjugated polyelectrolyte and the oxidized non-conjugated polymer electrolyte.

As shown in FIG. 2 and FIG. 3, the color change and / or the absorption spectrum can be compared before and after the oxidation.

The organic solar cell according to one embodiment of the present invention can oxidize the non-conjugated polymer electrolyte as the electron transporting layer, so that the thickness of the electron transporting layer can be adjusted as needed, and the high efficiency of the organic solar battery can be obtained.

In one embodiment of the present invention, the oxidized non-conjugated polyelectrolyte is oxidized using hydrogen peroxide (H ₂ O ₂ ).

In the present specification, the term "oxidation" means that electrons are separated from the non-conjugated polyelectrolyte to form a cation and bind to an anion of oxygen. For example, hydrogen peroxide is reacted with a non-conjugated polyelectrolyte containing an amine group (-NR ₂ , R is hydrogen or a monovalent organic group) so that the non-conjugated polymer electrolyte contains an ionic group of -N ⁺ R ₂ O ^- Modified.

In one embodiment of the present specification, the non-aqueous liquid polymer electrolyte before oxidation comprises at least one of -NR ₂ and -COOH, and R is hydrogen; Or a monovalent organic group.

In one embodiment of the present invention, the oxidized non-conjugated polyelectrolyte comprises at least one of -NR ₂ ⁺ O ^- and -COOH ⁺ O ^- , wherein R is hydrogen; Or a monovalent organic group.

In the present specification, the monovalent organic group means a functional group other than hydrogen, and includes a halogen group; A nitro group; Cyano; A carboxyl group; A hydroxy group; A carbonyl group; Sulfo group; An alkyl group; Allyl group; An alkoxy group; A cycloalkyl group; An alkenyl group; Ester group; Ether group; Sulfone group; Sparging time; Arylalkyl groups; An aryl group; And a heterocyclic group, which may be substituted or unsubstituted by additional substituents, but are not limited thereto.

In one embodiment of the present invention, the non-conjugated polymer electrolyte comprises a polyetherimine (PEI); Polyethylene imine ethoxylate (PEIE); Or polyacrylic acid (PAA).

In one embodiment of the present invention, the weight average molecular weight of the non-aqueous liquid polymer electrolyte prior to oxidation is 600,000 g / mol to 1,000,000 g / mol.

In this case, in the production of an organic solar cell, thin film formation may be easy.

In one embodiment of the present invention, the electron transporting layer has a thickness of 1 nm to 10 nm. The organic solar cell according to one embodiment of the present invention includes the oxidized non-conjugated polymer electrolyte, so that it can be applied to various thicknesses than the conventional thickness while maintaining the efficiency.

In one embodiment of the present invention, the organic solar cell is an inverted structure. The inverted structure may mean that the cathode is formed on the substrate. Specifically, according to one embodiment of the present invention, when the organic solar cell is an inverted structure, the electrode formed on the substrate may be a cathode.

1 shows an organic solar cell according to one embodiment.

1 specifically includes a substrate 101, a cathode 201, an electron transport layer 401, a photoactive layer 501, and an anode 301. The electron transport layer 401 may include an oxidized non-conjugated polyelectrolyte.

1 is an exemplary structure according to an embodiment of the present invention, and may further include another organic layer.

The organic solar cell of the inverted structure in this specification may mean that the anode and the cathode of the organic solar cell having a general structure are formed in the reverse direction. The Al layer used in organic solar cells of general structure is very vulnerable to oxidation reaction in the air and is difficult to be inked, so there is a limitation in commercialization through a printing process. However, since the organic solar cell of the above-described reverse structure can use Ag instead of Al, it is more stable than an organic solar cell having a general structure and is easy to produce Ag ink because it is stable in oxidation reaction. .

In the present specification, the substrate may be a glass substrate or a transparent plastic substrate having excellent transparency, surface smoothness, ease of handling, and waterproofness, but is not limited thereto, and any substrate commonly used in organic solar cells is not limited. Specific examples include glass or polyethylene terephthalate, polyethylene naphthalate (PEN), polypropylene (PP), polyimide (PI), and triacetyl cellulose (TAC) But is not limited thereto.

In this specification, the cathode may be a transparent conductive oxide layer or a metal electrode. When the electrode of the present invention is a transparent conductive oxide layer, the electrode may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyperopylene (PP), polyimide (PI), polycarbornate conductive material such as plastics such as polystyrene, polystyrene, POM (polyoxyethylene), acrylonitrile styrene copolymer (ABS), acrylonitrile butadiene styrene copolymer and TAC (triacetyl cellulose) Materials doped may be used. Specifically, a metal oxide such as ITO (indium tin oxide), fluorine doped tin oxide (FTO), aluminum doped zink oxide (AZO), IZO (indium zink oxide), ZnO-Ga ₂ O ₃ , ZnO-Al ₂ O ₃ and ATO (antimony tin oxide), and more specifically ITO.

Also, in this specification, the anode may be a metal electrode. Specifically, the metal electrode may be formed of a metal such as silver (Ag), aluminum (Al), platinum (Pt), tungsten (W), copper (Cu), molybdenum (Mo), gold (Au), nickel (Ni) ) Or a combination thereof. More specifically, the metal electrode may be silver (Ag).

In one embodiment of the present disclosure, the photoactive layer comprises an electron donor material and an electron acceptor material. In this specification, the electron donor material and the electron acceptor material may mean a photoactive material

In this specification, the ratio of the electron donor material and the electron acceptor material in the above-mentioned optically active layer can be adjusted as required by those skilled in the art.

In the photoactive layer, the electron donor material forms excitons paired with electrons and holes by photoexcitation, and the excitons are separated into electrons and holes at the interface of the electron donor / electron acceptor. The separated electrons and holes are transferred to the electron donor material and the electron donor material, respectively, and they are collected in the cathode and anode, respectively, so that they can be used as electric energy from the outside.

 Further, in one embodiment of the present specification, the photoactive layer may be a bulk heterojunction structure or a double layer junction structure. The bulk heterojunction structure may be a bulk heterojunction (BHJ) junction type, and the bilayer junction structure may be a bi-layer junction type.

According to one embodiment of the present disclosure, the electron donor material comprises at least one electron donor; Or a polymer of at least one electron acceptor and at least one electron donor. The electron donor may include at least one kind of electron donor. Further, the electron donor material includes a polymer of at least one kind of electron acceptor and at least one kind of electron donor.

Specifically, the electron donor may be selected from the group consisting of thiophene, fluorene, carbazole, etc. based on MEH-PPV (poly [2-methoxy-5- (2'-ethyl-hexyloxy) Of various polymeric and monomolecular materials.

Specifically, the monomolecular material is selected from the group consisting of copper (II) phthalocyanine, zinc phthalocyanine, tris [4- (5-decynomethylidene methyl- Amine (tris [4- (5-dicyanomethylidenemethyl-2-thienyl) phenyl] amine, 2,4-bis [4- (N, N- dibenzylamino) -2,6-dihydroxyphenyl] (2,4-bis [4- (N, N-dibenzylamino) -2,6-dihydroxyphenyl] squaraine, benz [b] anthracene, and pentacene. ≪ / RTI >

Specifically, the polymer material may be poly-3-hexyl thiophene (P3HT), poly [N-9'-heptadecanyl-2,7-carbazole- 2 ', 3'-benzothiadiazole)], PCPDTBT (poly [2,6- (4,4-bis- (2, ethylhexyl) -4H-cyclopenta [ 1-b, 3,4-b '] dithiophene) -tallow-4,7- (2,1,3-benxothiadiazole)], PFO-DBT (poly [2,7- (9,9- ) -tallow-5,5- (4,7-di2-thienyl-2,1,3-benzothiadiazole)], PTB7 (Poly [[4,8-bis [(2-ethylhexyl) oxy] benzo [ , 2-b: 4,5-b '] dithiophene-2,6-diyl] [3-fluoro-2- (2-ethylhexyl) carbonyl] thieno [3,4- b] thiophenediyl] DBT (Poly [2,7- (9,9-dioctyl-dibenzosilole) -alt-4,7-bis (thiophen-2-yl) benzo-2,1,3-thiadiazole] Or more species.

In one embodiment of the present disclosure, the electron donor material is selected from the group consisting of P3HT; Or a polymer comprising one or two or more units selected from the group consisting of a unit represented by the following formula (1) and a unit represented by the following formula (2).

[Chemical Formula 1]

(2)

In formulas (1) and (2)

x is a mole fraction, 0 < x < 1,

y is a molar fraction, 0 < y < 1,

x + y = 1,

l is the mole fraction, 0 < l < 1,

m is a mole fraction, 0 < m < 1,

l + m = 1,

n and o are each an integer of 1 to 10,000,

R1 to R9 are the same or different from each other, and each independently hydrogen; A substituted or unsubstituted alkyl group; A substituted or unsubstituted alkoxy group.

In one embodiment of the present invention, R 1 is a substituted or unsubstituted alkoxy group.

In one embodiment, R &lt; 1 &gt; is a substituted or unsubstituted octoxy group.

In one embodiment of the present specification, R1 is an octoxy group.

In one embodiment of the present specification, R 2 is a substituted or unsubstituted alkoxy group.

In another embodiment, R 2 is a substituted or unsubstituted octoxy group.

In another embodiment, R2 is an octoxy group.

In one embodiment of the present invention, R 3 is a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, R 3 is a substituted or unsubstituted dodecanyl group.

In one embodiment, R &lt; 3 &gt; is a dodecanyl group.

In one embodiment of the present specification, R4 is a substituted or unsubstituted alkyl group.

In one embodiment, R4 is a linear or branched alkyl group.

In one embodiment, R4 is a substituted or unsubstituted 2-ethylhexyl group.

In one embodiment of the present specification, R4 is a 2-ethylhexyl group.

In one embodiment of the present specification, R5 is a substituted or unsubstituted alkyl group.

In another embodiment, R5 is a linear or branched alkyl group.

In one embodiment of the present specification, R5 is a substituted or unsubstituted 2-ethylhexyl group.

In another embodiment, R5 is a 2-ethylhexyl group.

In one embodiment of the present specification, R6 is a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, R6 is a substituted or unsubstituted dodecanyl group.

In one embodiment, R6 is a dodecanyl group.

In one embodiment of the present disclosure, R7 is hydrogen.

In one embodiment, R8 is hydrogen.

In one embodiment of the present specification, R9 is a substituted or unsubstituted alkyl group.

In one embodiment of the present specification, R9 is a substituted or unsubstituted dodecanyl group.

In one embodiment, R9 is a dodecanyl group.

In one embodiment of the present invention, the unit represented by the formula (1) is represented by the following formula (1-1).

[Formula 1-1]

In Formula 1-1, n is the same as described above.

In one embodiment of the present invention, the unit represented by the formula (2) is represented by the following formula (2-1).

[Formula 2-1]

In Formula 2-1, o is the same as described above.

In one embodiment of the present invention, the terminal group of the polymer is a substituted or unsubstituted heterocyclic group or a substituted or unsubstituted aryl group.

In one embodiment of the present invention, the terminal group of the copolymer is a 4- (trifluoromethyl) phenyl group.

In one embodiment of the present invention, the electron acceptor material may be a fullerene derivative or a non-fullerene derivative.

In one embodiment of the present specification, the fullerene derivative is a fullerene derivative of C60 to C90. Specifically, the fullerene derivative may be a C60 fullerene derivative or a C70 fullerene derivative.

The fullerene derivative may be substituted or unsubstituted with an additional substituent.

The fullerene derivative has an ability to separate excitons (electron-hole pairs) and an excellent charge mobility as compared with the non-fullerene derivative, which is advantageous for the efficiency characteristics.

In one embodiment of the present invention, the organic solar cell includes one or more organic layers selected from the group consisting of a hole injecting layer, a hole transporting layer, a hole blocking layer, a charge generating layer, an electron blocking layer, .

In this specification, the hole transport layer and / or the electron transport layer material efficiently transport electrons and holes separated from the photoactive layer to the electrode, and the material is not particularly limited.

In this specification, the hole transporting layer material includes PEDOT: PSS (poly (3,4-ethylenediocythiophene) doped with poly (styrenesulfonic acid)), molybdenum oxide (MoO _x ); Vanadium oxide (V ₂ O ₅ ); Nickel oxide (NiO); And tungsten oxide (WO _x ), but the present invention is not limited thereto.

The electron transport layer material may be electron-extracting metal oxides, specifically a metal complex of 8-hydroxyquinoline; Complexes containing Alq ₃ ; Metal complexes including Liq; LiF; Ca; Titanium oxide (TiO _x ); Zinc oxide (ZnO); And cesium carbonate (Cs ₂ CO ₃ ), but the present invention is not limited thereto.

The disclosure also relates to a method of manufacturing a semiconductor device, comprising: preparing a substrate; Forming a cathode electrode on the substrate; Forming an electron transport layer on the cathode electrode; Forming a photoactive layer on the electron transporting layer; And forming an anode electrode on the photoactive layer,

Wherein the electron transport layer comprises an oxidized non-conjugated polyelectrolyte.

In this specification, the substrate, the cathode, the electron transport layer, the photoactive layer, and the anode electrode are the same as described above.

According to an embodiment of the present invention, the step of forming the electron transport layer may include oxidizing the non-conjugated polymer electrolyte to hydrogen peroxide; And forming an organic material layer including the oxidized non-conjugated polymer electrolyte.

In the present specification, when the non-conjugated polymer electrolyte is oxidized with hydrogen peroxide, water remains as a solvent of the non-conjugated polymer electrolyte.

In one embodiment of the present invention, one or two or more organic materials selected from the group consisting of a hole injecting layer, a hole transporting layer, a hole blocking layer, a charge generating layer, an electron blocking layer, an electron injecting layer, The method comprising:

The organic solar cell according to one embodiment of the present invention can use a known method except that it includes an oxidized non-conjugated polymer electrolyte.

In one embodiment of the present invention, the step of forming the anode and / or the cathode comprises sequentially cleaning the patterned ITO substrate with a detergent, acetone, or isopropanol (IPA) The substrate is dried for 1 to 30 minutes, specifically at 250 ° C for 10 minutes, and the surface of the substrate can be modified to be hydrophilic when the substrate is completely cleaned. Pre-treatment techniques for this include a) surface oxidation using a parallel plate discharge, b) a method of oxidizing the surface through ozone generated using UV ultraviolet radiation in vacuum, and c) using oxygen radicals generated by the plasma And a method of oxidizing it by the above method can be used. Through the surface modification as described above, the junction surface potential can be maintained at a level suitable for the surface potential of the hole injection layer, the formation of the polymer thin film on the ITO substrate is facilitated, and the quality of the thin film can be improved. It is possible to select one of the above methods depending on the state of the substrate. Regardless of which method is used, a substantial effect of the pretreatment can be expected in order to prevent oxygen escape from the surface of the substrate and to keep moisture and organic matter as much as possible.

In an embodiment of the present invention described below, a method of oxidizing the surface through ozone generated using UV is used. After the ultrasonic cleaning, the patterned ITO substrate is baked on a hot plate, The next chamber is filled with the UV lamp, and the ITO substrate patterned by the ozone generated by the reaction of the oxygen gas with the UV light is cleaned. However, the method for modifying the surface of the patterned ITO substrate in the present invention is not particularly limited, and any method may be used as long as it is a method for oxidizing the substrate.

The electron transport layer in this specification may be formed on one side of the cathode using a sputtering method, an E-beam method, a thermal evaporation method, a spin coating method, a screen printing method, an ink jet printing method, a doctor blade slot-die method or a gravure printing method, .

In this specification, the photoactive layer may be formed by dissolving the photoactive materials described above in an organic solvent, and then spin-coating the solution to a thickness ranging from 50 nm to 280 nm. At this time, the photoactive layer may be applied by dip coating, screen printing, spray coating, doctor blade, brush painting or the like.

Hereinafter, the present invention will be described in detail by way of examples with reference to the drawings. However, the embodiments according to the present disclosure can be modified in various other forms, and the scope of the present specification is not construed as being limited to the embodiments described below. Embodiments of the present disclosure are provided to more fully describe the present disclosure to those of ordinary skill in the art.

Example 1.

ITO was formed as a first electrode on a substrate, and an electron transport layer was formed by spin-coating a material in which polyetherimine (PEI) was oxidized to hydrogen peroxide on ITO. A photoactive layer was formed on the electron transport layer by spin coating using PC ₆₁ BM and the above Formula 1-1, and a hole transport layer was formed on the photoactive layer. The hole transport layer was formed on the photoactive layer by a deposition method of MoO ₃ (8 nm to 20 nm), and finally a second electrode was formed by depositing Ag (100 nm to 200 nm) on the hole transport layer.

Example 2.

An organic solar cell was prepared in the same manner as in Example 1, except that the photoactive layer of Formula 1 and the PC ₇₁ BM were used.

Example 3.

An organic solar cell was prepared in the same manner as in Example 1, except that the photoactive layer in Example 1 was used in the above Formula 2-1 and PC ₆₁ BM.

Comparative Example 1

An organic solar cell was prepared in the same manner as in Example 1, except that polyetherimine (PEI) was used instead of the oxidized polyetherimine in Example 1.

Comparative Example 2

An organic solar cell was prepared in the same manner as in Example 2, except that polyetherimine (PEI) was used instead of the oxidized polyetherimine in Example 2.

Comparative Example 3

An organic solar cell was prepared in the same manner as in Example 3, except that polyetherimine (PEI) was used instead of the oxidized polyetherimine in Example 3.

The photoelectric conversion characteristics of the organic solar cells prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were measured under the conditions of 100 mW / cm ² (AM 1.5), and the results are shown in Table 1 below.

V _oc (V) J _sc (mA / cm ² ) FF 侶 (%) Mean η (%) Example 1 0.650 8.795 0.728 4.16 4.13 0.645 8.808 0.722 4.10 Example 2 0.867 13.330 0.651 7.53 7.50 0.863 13.204 0.655 7.47 Example 3 0.943 13.222 0.633 7.90 7.93 0.938 13.333 0.636 7.95 Comparative Example 1 0.641 8.747 0.689 3.86 3.92 0.640 8.774 0.709 3.98 Comparative Example 2 0.883 11.791 0.582 6.16 6.17 0.879 12.024 0.585 6.18 Comparative Example 3 0.948 12.664 0.544 6.53 6.54 0.953 13.396 0.513 6.55

In Table 1, V _oc is the open-circuit voltage, J _sc is the short-circuit current, FF is the fill factor, and PCE is the energy conversion efficiency. The open-circuit voltage and the short-circuit current are the X-axis and Y-axis intercepts in the fourth quadrant of the voltage-current density curve, respectively. The higher the two values, the higher the efficiency of the solar cell. The fill factor is the width of the rectangle that can be drawn inside the curve divided by the product of the short-circuit current and the open-circuit voltage. The energy conversion efficiency can be obtained by dividing these three values by the intensity of the irradiated light, and a higher value is preferable.

The results shown in Table 1 show that the organic solar cell including the oxidized non-conjugated polyelectrolyte as the electron transport layer has higher efficiency than that of the organic solar cell including the unoxidized polyelectrolyte not oxidized have.

101: substrate
201: cathode
301: anode
401: electron transport layer
501: photoactive layer
601: hole transport layer

Claims (14)

Cathode;
An anode disposed opposite to the cathode;
A photoactive layer disposed between the cathode and the anode; And
And an electron transport layer provided between the cathode and the photoactive layer,
Wherein the electron transport layer comprises an oxidized non-conjugated polymer electrolyte. The method according to claim 1,
Wherein the oxidized non-conjugated polyelectrolyte is oxidized using hydrogen peroxide. The method according to claim 1,
Wherein the non-aqueous liquid polymer electrolyte before oxidation comprises at least one of -NR ₂ and -COOH,
R is hydrogen; Or a monovalent organic group. The method according to claim 1,
Wherein the oxidized non-conjugated polyelectrolyte comprises at least one of -NR ₂ ⁺ O ^- and -COOH ⁺ O ^-
R is hydrogen; Or a monovalent organic group. The method according to claim 1,
The non-conjugated polymer electrolyte may include polyetherimine (PEI); Polyethylene imine ethoxylate (PEIE); Or polyacrylic acid (PAA). The method according to claim 1,
Wherein the weight average molecular weight of the non-aqueous liquid polymer electrolyte prior to oxidation is 600,000 g / mol to 1,000,000 g / mol. The method according to claim 1,
Wherein the organic solar cell is an inverted structure. The method according to claim 1,
Wherein the electron transporting layer is provided in contact with the photoactive layer. The method according to claim 1,
Wherein the photoactive layer comprises an electron donor material and an electron acceptor material. The method of claim 9,
Wherein the electron acceptor material comprises a fullerene derivative or a non-fullerene derivative. The method of claim 9,
Wherein the electron donor material is selected from the group consisting of P3HT; Or a polymer comprising one or two or more units selected from the group consisting of a unit represented by the following formula (1) and a unit represented by the following formula (2):
[Chemical Formula 1]

(2)

In formulas (1) and (2)
x is a mole fraction, 0 < x < 1,
y is a molar fraction, 0 < y < 1,
x + y = 1,
l is the mole fraction, 0 < l < 1,
m is a mole fraction, 0 < m < 1,
l + m = 1,
n and o are each an integer of 1 to 10,000,
R1 to R9 are the same or different from each other, and each independently hydrogen; A substituted or unsubstituted alkyl group; A substituted or unsubstituted alkoxy group. The method according to claim 1,
Wherein the organic solar cell further comprises one or more organic layers selected from the group consisting of a hole injecting layer, a hole transporting layer, a hole blocking layer, a charge generating layer, an electron blocking layer, an electron injecting layer and an electron transporting layer. . Preparing a substrate;
Forming a cathode electrode on the substrate;
Forming an electron transport layer on the cathode electrode;
Forming a photoactive layer on the electron transporting layer; And
And forming an anode electrode on the photoactive layer,
Wherein the electron transport layer comprises an oxidized non-conjugated polyelectrolyte. 14. The method of claim 13,
The step of forming the electron transport layer
Oxidizing the non-conjugated polyelectrolyte with hydrogen peroxide; And
And forming an organic material layer including an oxidized non-conjugated polymer electrolyte.

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