KR20180033916A - Method for manufacturing organic photovoltaics and organic photovoltaics manufactured by the same - Google Patents

Abstract

The present invention relates to a method for manufacturing organic photovoltaics and organic photovoltaics manufactured by the same. More particularly, the method comprises a step of forming a plurality of thin film layers on a first electrode layer laminated on a substrate; and a step of forming a second electrode layer on the thin film layer. The step of forming the thin film layer includes a step of spraying a coating solution by electrospinning to perform slot die coating. The manufacturing method of the present invention not only improves the film quality and surface quality of the thin film layer by spraying the coating solution through electrospinning to perform slot die coating but also facilitates the formation of an intended thin film pattern and reduces unnecessary solvent and manufacturing time to improve the processing characteristic and productivity of the organic photovoltaics. In addition, the organic photovoltaics according to the present invention exhibit excellent reliability and performance, and thus can be applied to various fields of organic photovoltaics.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an organic solar cell,

The present invention relates to a method of manufacturing an organic solar cell capable of improving the performance of the organic solar cell through the formation of a thin film layer with a minimized film quality and thickness deviation, and an organic solar cell produced therefrom.

Generally, a solar cell is a photovoltaic cell designed to convert solar energy into electrical energy, which means a semiconductor device that converts light energy generated from the sun into electrical energy. Such a solar cell is expected to be an energy source capable of solving future energy problems because it has low pollution, has an infinite resource, and has a semi-permanent life span. In recent years, research on low-cost solar cells that reduce power generation costs and research on high-efficiency solar cells that improve conversion efficiency are under way at the same time.

Solar cells can be divided into inorganic solar cells and organic solar cells depending on the material constituting the photoactive layer among the internal constituent materials. Inorganic solar cells are mainly made of monocrystalline silicon. These monocrystalline silicon solar cells are superior in terms of efficiency and stability and occupy most of the solar cells that are currently mass-produced. However, securing raw materials, lightening, And it shows limitations in technology development.

On the other hand, since organic solar cells use organic materials such as a small molecule (expressed as a single molecule) or a polymer as an organic semiconductor material, they are much cheaper than the inorganic materials used in inorganic solar cells, It is possible to process and improve the productivity easily. In addition, since the process proceeds to a solution-based process at a relatively low temperature as compared with other semiconductor technologies, the manufacturing process can be simplified, high-speed, and large-sized. In addition, organic solar cells have been actively studied since they have an advantage that they can be easily applied to various substrates such as low-priced glass and plastic which may be a problem in high temperature treatment.

The organic solar cell is composed of an electrode / photoactive layer / electrode. By using a metal having a different work function for both electrodes, charges generated in the photoactive layer move along the direction of the bulit-in-potential, And operates as a power source. Accordingly, a transparent electrode including a transparent conductive oxide (TCO) having a high transparency and a work function is formed on a surface on which light is incident, and a transparent electrode including a metal electrode This is mainly used. The photoactive layer includes an organic semiconductor material and has a D / A bi-layer structure of an electron donor and an electron acceptor or a bulk heterojunction (D + A) blend structure, and in some cases a mixed structure (D / (D + A) / A) in which the latter bulk heterojunction structure is interposed between the two donor-acceptor layers of the former. At this time, a hole transporting layer and an electron transporting layer may be further included as needed.

Therefore, the organic solar cell has a multilayer thin film structure in which a photoactive layer, a hole transporting layer, and an electron transporting layer are introduced between both electrodes, and the shape, structure and lamination state of each thin film are directly related to the performance of the organic solar cell. Technology.

Conventional organic solar cells having a multilayer thin film structure can be manufactured by various coating methods such as slot die coating, spin coating and gravure coating, and a roll-to-roll slot die coating method is mainly used .

However, in the case of forming a thin film layer by a roll-to-roll method using a slot die, spreadability and wettability are not good due to the surface energy of the thin film formed earlier and the surface tension of the coating solution to be coated later. As a result, There is a problem that it is difficult to obtain a thin film. Also, if the roll-to-roll process is repeated several times, there is a high possibility that the surface of the web is contaminated, and the generated contamination causes surface tension imbalance of the coating solution, thereby causing defects on the surface of the thin film.

Various methods have been studied to solve the problems in slot die coating.

For example, Korean Patent Laid-Open Publication No. 2013-0121566 discloses a method of uniformly forming a material on a substrate by introducing protrusions and spreading guide protrusions in a discharge portion of a slot die.

Korean Patent Laid-Open Publication No. 2015-0001956 discloses a method for improving the film quality and uniformity of a coating layer by forming a coating layer on one side of a base film while transferring the base film using a roll having a surface temperature of 40 to 100 ° C have.

These patents have somewhat improved the problem of forming a thin film through slot die coating, but the effect is not sufficient. Therefore, there is a further need for development of a method for producing an organic solar cell capable of forming a thin film of excellent quality through a simple process.

Korean Patent Laid-Open Publication No. 2013-0121566 (2013.11.06), slot die and method for manufacturing organic solar cell using the same Korean Patent Laid-Open Publication No. 2015-0001956 (2015.01.07), a method for manufacturing an organic solar cell, and an organic solar cell manufactured using the same

As a result of various studies to solve the above problems, the present inventors have found that when the coating solution is injected through the electrospinning method in the slot die process, the surface characteristics of the thin film layer are improved and the thin film is easily formed, And reliability can be improved.

Accordingly, it is an object of the present invention to provide a method for producing an organic solar cell capable of producing a coating layer having an excellent film quality and a uniform thickness.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, including: forming a plurality of thin film layers on a first electrode layer laminated on a substrate; And forming a second electrode layer on the thin film layer, wherein the step of forming the thin film layer includes a step of slot-die coating by spraying the coating solution by electrospinning .

In the method of manufacturing an organic solar cell of the present invention, the first electrode layer may be a cathode, the second electrode layer may be an anode, and the forming the thin film layer may include: forming an electron transport layer on the first electrode layer; Forming a photoactive layer on the electron transporting layer; And forming a hole transport layer on the photoactive layer.

In the method of manufacturing an organic solar cell of the present invention, the first electrode layer is an anode, the second electrode layer is a cathode, and the forming the thin film layer includes: forming a hole transport layer on the first electrode layer; Forming a photoactive layer on the hole transport layer; And forming an electron transport layer on the photoactive layer.

The electrospinning is performed by applying a voltage of 0.1 to 60 kV.

The method of manufacturing the organic solar cell is characterized in that a slot die coating is performed by spraying a coating solution by electrospinning while transferring the substrate by a roll-to-roll method.

The present invention also provides an organic solar cell manufactured by the above-described method for manufacturing an organic solar battery.

In the method of manufacturing an organic solar cell according to the present invention, a thin film layer having excellent film quality and uniform thickness can be formed by spraying a coating solution by electrospinning and slot-die coating, and thin film having a thinner thickness can be easily formed. In addition, since a separate processing step of the coating solution is not required from the viewpoint of the process, the productivity is improved and the process stability is improved, so that the defect rate can be greatly reduced. Accordingly, the organic solar cell produced according to the present invention exhibits improved performance and lifetime characteristics.

FIG. 1 is a view schematically showing a method of manufacturing an organic solar cell by a roll-to-roll type slot die coating method according to an embodiment of the present invention.
2 is a schematic view of a slot die applied in a method of manufacturing an organic solar cell according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can readily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like reference numerals in the drawings denote like elements, and the sizes and thicknesses of the respective elements may be exaggerated for convenience of explanation.

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 invention provides a method for manufacturing an organic solar cell capable of improving the performance of an organic solar cell by forming a multilayer thin film structure of uniform quality.

Organic solar cells are composed of an anode and a cathode positioned on opposite sides of a substrate, and a multilayer thin film positioned between the anode and the cathode and including an electron transporting layer, a photoactive layer, and a hole transporting layer.

Such an organic solar cell having a multilayer thin film structure is manufactured by various coating methods such as slot die coating, spin coating and gravure coating, and a roll-to-roll slot die coating method is mainly used.

Generally, the slot die gradually discharges the coating solution contained therein. The viscosity of the coating solution, the volatility of the solvent, and the surface tension upon contact with the substrate were not suitable for discharging the coating solution at this time, making it difficult to form a uniform thin film. Particularly, when forming a multilayer thin film, there is a limit to uniformly form a thin film in a desired shape due to differences in physical properties of the coating solution for each layer, which reduces the performance and lifetime of the organic solar cell. Therefore, in order to form a flat and uniform thin film, a method of increasing the surface energy of the pre-formed thin film or lowering the surface tension of the coating solution to be coated later may be considered, but in this case, there is a risk of changing the properties of the thin film to be formed. In order to increase the productivity and to form a thinner thin film, the coating solution should be diluted with an appropriate viscosity. In this case, the solution consumes more than the actual usage amount, and it takes a lot of time and cost to select the optimal concentration.

Accordingly, in forming a thin film layer of an organic solar cell, the coating solution is sprayed through electrospinning to stably form a uniform thin film on a desired pattern, thereby improving the efficiency of the organic solar battery. In addition, when a coating solution is sprayed through electrospinning, a separate dilution process is not necessary, which is advantageous in view of productivity and economy.

Specifically, a method of fabricating an organic solar cell according to an embodiment of the present invention includes: forming a plurality of thin film layers on a first electrode layer laminated on a substrate; And forming a second electrode layer on the thin film layer, wherein the step of forming the thin film layer includes a step of slot-die coating by spraying the coating solution by electrospinning.

First, a method of manufacturing an organic solar cell according to an embodiment of the present invention includes forming a plurality of thin film layers on a first electrode layer laminated on a substrate.

The substrate is not particularly limited as long as it has transparency so that light can be transmitted therethrough.

The substrate may be a transparent inorganic substrate such as quartz or glass or a transparent inorganic substrate such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polystyrene (PS), polypropylene (PP), polyimide One kind of transparent plastic substrate selected from the group consisting of polyethylene sulfonate (PES), polyoxymethylene (POM), polyether ether ketone (PEEK), polyether sulfone (PES) and polyetherimide have. It is preferable to use a transparent plastic substrate in the form of a film which is flexible and has high chemical stability, mechanical strength and transparency.

Further, the substrate preferably has a transmittance of at least 70% or more, preferably 80% or more in a visible light wavelength region of about 400 to 750 nm.

The thickness of the substrate is not particularly limited and may be suitably determined according to the intended use, for example, 1 to 500 탆.

The first electrode layer may be a cathode or a cathode. An organic solar cell manufactured according to an embodiment of the present invention has an inverted structure, and the first electrode layer is a cathode.

Since the cathode is formed on the substrate and light passing through the substrate can reach the photoactive layer, it is preferable to use a conductive material having a high transparency and a high work function and a low resistance of about 4.5 eV or more Do.

The anode may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), indium tin zinc oxide (ITZO) Doped zinc oxide (GZO), Al-doped zinc oxide (AZO), fluorine-doped tin oxide (FTO), zinc tin oxide ; ZTO), InGaP (indium gallium oxide _{oxide; IGO), ZnO-Ga 2} O 3, ZnO-Al 2 O 3, SnO2-Sb 2 O 3 and a metal oxide transparent electrode is selected from the group consisting of; An organic transparent electrode such as a conductive polymer, a graphene thin film, a graphene oxide thin film, or a carbon nanotube thin film; Or an organic-inorganic bonding transparent electrode such as a carbon nanotube thin film to which a metal is bonded.

The thickness of the cathode may be 10 to 3000 nm.

The cathode may be formed on the above-described substrate according to a conventional method. Specifically, the negative electrode may be formed on one side of the substrate by thermal vapor deposition, electron beam deposition, RF or magnetron sputtering, chemical vapor deposition, or the like.

At least one method selected from the group consisting of O ₂ plasma treatment, UV / ozone cleaning, surface cleaning using an acid or an alkali solution, nitrogen plasma treatment, and corona discharge cleaning may be selectively performed on the substrate prior to formation of the cathode The surface of the substrate may be pretreated.

The substrate on which the first electrode layer is formed is transported by a roll-to-roll method while being coated with a coating solution to form a thin film layer. The thin film layer may be at least one selected from the group consisting of an electron transporting layer, a photoactive layer, and a hole transporting layer.

In one embodiment of the present invention, the thin film layer is formed by slot die coating by spraying a coating solution by an electrospinning method.

1 is a schematic view illustrating a process for manufacturing an organic solar cell according to an embodiment of the present invention through a roll-to-roll slot die coating method. 1, the slot die 10, 10 ', 10 " is provided on a substrate 1 movement path in which a film-shaped substrate 1 is continuously supplied in a roll-to- A coating solution is applied to form a thin film layer (2). The slot dies 10, 10 ', 10 " are spaced apart on the movement path of the substrate 1 continuously supplied. The coating solution is discharged from the slot die 10, 10 ', 10 " The coating solution discharged from each of the slot die 10, 10 ', 10 " is sequentially laminated, and a plurality of thin film layers 2 are sequentially laminated on one substrate 1 to produce an organic solar cell having a multilayer thin film structure .

Electrospinning is a technique for producing ultrafine fibers with a diameter of several tens to several hundreds of nanometers by using an electric field. When an electric force is applied to a polymer solution dissolved in a solvent or a solvent, a polymer The charge is induced to the liquid surface of the solution and the force due to the mutual repulsive force of the induced charges is generated in the direction opposite to the surface tension. At this time, when a high voltage exceeding the surface tension of the polymer solution is applied, the polymer solution jet discharged by the electric repulsive force is released. The jet is finely torn and fibrillated while the air is blown, and the solvent is volatilized, This is the way to get.

As described above, when the thin film is formed by the conventional slot die coating method, the thin film surface becomes uneven or the meniscus is generated due to the difference in physical properties between the coating solution and the previously coated thin film, The same transformation takes place. On the contrary, in the present invention, by applying an electrospinning method to the slot die, an electrostatic attractive force stronger than the surface tension of the coating solution is applied, thereby reducing the surface tension of the coating solution. As a result, the spreading of the coating solution sprayed through the slot die nozzle And improves wettability. Accordingly, it is possible to easily form a thin film having a nanometer thickness, and to improve the uniformity of the thin film surface and the pattern. In addition, when the coating solution is sprayed through electrospinning, the coating solution can be used as it is without dilution. Therefore, the dilution process performed in the conventional slot die coating process can be omitted, the processability can be improved, to be.

Accordingly, the slot die 10, 10 ', 10 "used in the method of manufacturing an organic solar cell according to an embodiment of the present invention includes a coating solution tank 20 and an external power source 30.

The coating solution tank 20 is for storing a coating solution, and the coating solution may vary depending on the thin film layer to be formed. The coating solution tank 20 may pressurize the coating solution using a built-in pump (not shown) to provide the coating solution to the slot die 10, 10 ', 10 " nozzles.

The external power source 30 applies a voltage to the slot die 10, 10 ', 10 " nozzles so that the coating solution is sprayed through the electrospinning method. The voltage may vary depending on the type of coating solution, the amount of spray, the process environment, and the like.

In one embodiment of the present invention, the voltage applied during electrospinning may range from 0.1 to 60 kV, preferably from 1 to 10 kV. If the voltage is lower than the above range, the desired effect can not be obtained. On the other hand, if the voltage is higher than the above range, the physical properties of the coating solution may be changed and adversely affect the quality of the thin film formed.

The voltage may be either direct current or alternating current. As described above, the voltage applied by the external power supply 30 emits the coating solution electrospun from the slot die 10, 10 ', 10 " nozzles.

The sprayed coating solution is sprayed onto the substrate 1 located below the slot die 10, 10 ', 10 ". The substrate 1 may be grounded and accordingly have a ground voltage, for example a voltage of 0V. The substrate 1 may have a voltage opposite to that of the slot die 10, 10 ', 10 ". The positional relationship between the substrate 1 and the slot die 10, 10 ', 10 " in FIG. 2 is illustrative and not restrictive.

The external power source 30 charges the slot die 10, 10 ', 10 " to a positive voltage or a negative voltage so that the coating solution contained in the slot die 10, 10', 10 " So that a voltage difference is generated between the substrate 1 having a grounded or opposite voltage. When a voltage is applied to the slot die 10, 10 ', 10 " by the external power source 30, between the nozzle of the slot die 10, 10', 10 " / m < / RTI > may be formed. The coating solution is sprayed onto the substrate 1 by the voltage difference to form a thin film layer.

By controlling the flow rate of the coating solution and the voltage difference between the nozzle of the slot die 10, 10 ', 10 "and the substrate 1, the thickness of the thin film layer formed on the substrate 1 is controlled by the spraying of the coating solution . For example, the thin film layer may have a thickness in the range of about 100 nm to 10 [mu] m.

The coating solution may be an organic or inorganic material contained in each thin film layer constituting the organic solar battery. The coating solution includes a thin film layer-forming material and a solvent. Specifically, the thin film layer forming material included in the coating solution may be at least one selected from the group consisting of a material for forming an electron transport layer, a material for forming a photoactive layer, and a material for forming a hole transport layer. And the like.

When the step of forming the thin film layer is a step of forming an electron transporting layer, the coating solution includes a material for forming an electron transporting layer. The electron transport layer-forming material may be a metal chloride, metal acetate, metal citrate, metal acrylate, metal bromide, ), Metal phosphates, metal sulfates, and metal oxide precursors selected from the group consisting of metal sulfides, or metal oxide particles prepared therefrom. The metal may be selected from the group consisting of titanium, zinc, silicon, manganese, strontium, indium, barium, potassium, niobium, (Fe), tantalum (Ta), tungsten (W), bismuth (Bi), nickel (Ni), copper (Cu), molybdenum (Mo), cerium (Ce), platinum Rhodium (Rh), and the like.

When the step of forming the thin film layer is a step of forming a photoactive layer, the coating solution contains a hole receptor and an electron acceptor as materials for forming a photoactive layer. The hole receptor includes an electrically conductive polymer or an organic low-molecular-weight semiconductor material. The electrically conductive polymer may be at least one member selected from the group consisting of polythiophene, polyphenylenevinylene, polyfulorene, polypyrrole, and copolymers thereof. The organic low-molecular semiconductor material may include one or more selected from the group consisting of pentacene, anthracene, tetracene, perylene, oligothiophene, and derivatives thereof. can do.

Preferably, the hole acceptor is selected from the group consisting of poly-3-hexylthiophene (P3HT), poly-3-octylthiophene (P3OT), poly- polyvinylidene fluoride (PPV), poly (9,9'-dioctylfluorene), poly (2-methoxy-5- (2-ethyl-hexyloxy) , 2-methoxy-5- (2-ethyl-hexyloxy) -1,4-phenylenevinylene (MEH-PPV) -Dimethyloctyloxy)) - 1,4-phenylene vinylene (MDMOPPV), which is a compound selected from the group consisting of poly (2-methyl-5- And may include one or more species.

The electron acceptor may be at least one selected from the group consisting of fullerene (C ₆₀ ), fullerene derivatives such as C ₇₀ , C ₇₆ , C ₇₈ , C ₈₀ , C ₈₂ and C ₈₄ , CdS, CdSe, CdTe and ZnSe . ≪ / RTI >

Preferably, the electron acceptor (6,6) -phenyl -C ₆₁ - butyric rigs Acid methyl ester _{((6,6) -phenyl-C 61} -butyric acid methyl ester; PCBM), (6,6) - phenyl- C ₇₁ - butyric rigs Acid methyl ester _{((6,6) -phenyl-C 71} -butyric acid methyl ester; C 70 -PCBM), (6,6) - thienyl -C ₆₁ - butyric rigs Acid methyl ester (( 6,6) -thienyl-C ₆₁ -butyric acid methyl ester (ThCBM), and carbon nanotubes.

More preferably, the photoactive layer may comprise a mixture of P3HT as a hole acceptor and PCBM as an electron acceptor, wherein the combined weight ratio of P3HT and PCBM may be from 1: 0.1 to 1: 2.

The photoactive layer may be a bulk heterojunction structure in which a hole receptor and an electron acceptor are mixed.

At this time, the thickness of the photoactive layer may be 10 to 1000 nm, preferably 100 to 500 nm. When the thickness of the photoactive layer 30 is less than the above range, the solar light can not be sufficiently absorbed and the photocurrent is lowered and the efficiency is expected to decrease. Conversely, when the thickness exceeds the above range, excited electrons and holes can not move to the electrode Degradation problems may occur.

When the step of forming the thin film layer is a step of forming a hole transporting layer, the coating solution includes a material for forming a hole transporting layer. The hole transport layer forming material may be at least one selected from the group consisting of poly (3,4-ethylenedioxythiophene), poly (styrenesulfonate), polyaniline, phthalocyanine, pentacene, polydiphenylacetylene, poly (t- Poly (trimethylsilyl) diphenylacetylene, poly (trimethylsilyl) diphenylacetylene, poly (trimethylsilyl) diphenylacetylene, poly ) Poly (phenylacetylene), polydiacetylene, polydiacetylene, polyphenylacetylene, polypyridine acetylene, polymethoxyphenylacetylene, polymethylphenylacetylene, poly (t- And poly (trimethylsilyl) phenylacetylene. ≪ / RTI > Preferably, the composition for forming the hole transport layer may comprise a mixture of poly (3,4-ethylenedioxythiophene) and poly (styrenesulfonate).

The content of the coating solution can be appropriately controlled according to the thin film layer to be formed, and specifically 5 to 99% by weight based on the total weight of the coating solution.

The solvent can be used without particular limitation, as long as it can dissolve or disperse the thin film layer forming materials described above. For example, the solvent may be water; Alcohols such as ethanol, methanol, propanol, isopropyl alcohol and butanol; Or an organic solvent such as acetone, pentane, toluene, benzene, diethyl ether, methyl butyl ether, N-methylpyrrolidone, tetrahydrofuran, dimethylformamide, dimethylacetamide, dimethylsulfoxide, carbon tetrachloride, dichloromethane, Organic solvents such as trichlorethylene, chloroform, chlorobenzene, dichlorobenzene, trichlorobenzene, cyclohexane, cyclopentanone, cyclohexanone, dioxane, terpineol and methyletherketone, or mixtures thereof, It is preferable that the photoactive layer is appropriately selected from the above-mentioned solvents depending on the kind of the target substance.

The solvent may be contained in an amount of the remainder in the above-mentioned coating solution, and preferably 1 to 95% by weight based on the total weight of the coating solution. When the content of the solvent is less than the above range, it is difficult to form a thin film having a uniform thickness. On the other hand, when the content of the solvent exceeds the above range, it is difficult to obtain the desired thin film layer function.

When forming each thin film layer on the substrate, the substrate may be transported in a roll-to-roll manner at a rate of 0.01 m / min to 20 m / min, preferably 0.1 m / min to 5 m / min. The feed rate may be optimized according to the coating and drying speed of the thin film layer using the roll-to-roll equipment.

 The coating solution is sprayed on the transferred substrate by electrospinning, and the sprayed coating solution is coated through a slot die coating to form respective thin film layers. After the coating solution is coated, a post-treatment process may be carried out by selectively drying or heat-treating the coated substrate. The drying may be carried out by hot air drying, NIR drying, or UV drying at 50 to 400 ° C, preferably 70 to 200 ° C for 1 to 30 minutes.

The thickness of the thin film layer formed according to the above-described method can be appropriately determined depending on the application, and may be preferably 10 nm to 10 탆, more preferably 20 nm to 1 탆. When the thickness of the thin film layer is within the above range, the efficiency of the produced organic solar cell is most excellent.

Next, a second electrode layer is formed on the substrate on which the thin film layer is formed. In one embodiment of the present invention, the second electrode layer is an anode.

The anode may be formed by a method such as screen printing, gravure printing, gravure-offset printing, thermal vapor deposition, electron beam deposition, RF or magnetron sputtering, chemical vapor deposition, or the like.

The anode forming material may be at least one selected from the group consisting of Ag, Cu, Au, Pt, Ti, Al, Ni, Zr, Metal particles such as manganese (Mn); Or a precursor containing the metal element, for example, silver nitrate _{(AgNO 3), Cu (HAFC} ) 2 (Cu (hexafluoroacetylacetonate) 2,), Cu (HAFC) (1,5-Cyclooctanediene), Cu (HAFC) (1 , 5-Dimethylcyclooctanediene), Cu ( HAFC) (4-Methyl-1-pentene), Cu (HAFC) (Vinylcyclohexane), Cu (HAFC) (DMB), Cu (TMHD) 2 (Cu (tetramethylheptanedionate) 2), DMAH (dimethylaluminum hydride), TMEDA (tetramethylethylenediamine ), DMEAA (dimethylethylamine alane, NMe 2 Et · AlH 3), TMA (trimethylaluminum), TEA (triethylaluminum), TBA (triisobutylaluminum), TDMAT (tetra (dimethylamino) titanium), TDEAT (tetra (dimethylamino) titanium).

In the method of manufacturing an organic solar cell according to an embodiment of the present invention, a coating solution for forming a thin film layer is sprayed by an electrospinning method and slot-die-coated to form a flat and uniform thin film, A thin film having a thickness of the order of nanometers can be formed. In addition, due to the electrostatic force used in electrospinning, a part of the coating solution is dried immediately after coating, so that dewetting can be prevented and a thin film having an improved quality can be formed. The organic solar cell including the thin film layer formed by the above-described method in a multi-layered structure can exhibit improved performance and lifetime.

The present invention also provides an organic solar cell produced by the above-described production method.

The organic solar cell manufactured according to one embodiment of the present invention is an organic solar cell having an inverted structure.

The organic solar cell of the inverted structure includes a substrate; A negative electrode formed on the substrate; An electron transport layer formed on the cathode; A photoactive layer formed on the electron transporting layer; A hole transport layer formed on the photoactive layer; And a positive electrode formed on the hole transporting layer. At this time, the electron transporting layer and the hole transporting layer may be selectively included.

The substrate, the cathode, the electron transporting layer, the photoactive layer, the hole transporting layer, and the anode constituting the organic solar cell of the inverted structure are the same as those described above.

As described above, a method of manufacturing an organic solar cell having an inverted structure according to an embodiment of the present invention has been described. However, the production method of the organic solar cell of the present invention is not limited to the production of the organic solar cell having the above structure. In another embodiment of the present invention, a method of manufacturing an organic solar cell may be employed as a method of manufacturing an organic solar cell having a structure in which an anode, a hole transporting layer, a photoactive layer, an electron transporting layer, and a cathode are sequentially stacked. The hole transporting layer and the electron transporting layer may be omitted if necessary.

Particularly, in the method of manufacturing an organic solar cell according to the present invention, a thin film layer having excellent film quality and minimized thickness deviation can be formed as a coating solution is injected by electrospinning to form a slot die when a thin film layer is formed. The conventional roll-to-roll type slot die coating process has been difficult to obtain a thin film layer having a good film quality, and a separate process for diluting the coating solution to an optimum viscosity has been required. However, the thin film layer of the organic solar cell manufactured according to the present invention is thin, uniform, uniform in surface, and can be produced in a desired pattern. As a result, the performance and lifetime characteristics of the organic solar battery can be improved.

The method of manufacturing an organic solar cell according to the present invention can stably form a thin film layer having excellent film quality and minimized thickness deviation by spraying the coating solution through electrospinning and slot-die coating without changing the composition of the coating solution, The performance and reliability of the solar cell can be improved. In addition, since the production method is excellent in productivity and stability in view of processability, the defective rate can be greatly reduced.

1: substrate 2: thin film layer
10, 10 ', 10 ": Slot die 20: Coating solution tank
30: External power source

Claims (6)

Forming a plurality of thin film layers on a first electrode layer stacked on a substrate; And
And forming a second electrode layer on the thin film layer,
Wherein the step of forming the thin film layer comprises a step of forming a slot die coating by spraying the coating solution by electrospinning. The method according to claim 1,
Wherein the first electrode layer is a cathode, the second electrode layer is an anode,
The forming of the thin film layer may include: forming an electron transport layer on the first electrode layer; Forming a photoactive layer on the electron transporting layer; And forming a hole transport layer on the photoactive layer. The method according to claim 1,
The first electrode layer is an anode, the second electrode layer is a cathode,
The forming of the thin film layer may include: forming a hole transport layer on the first electrode layer; Forming a photoactive layer on the hole transport layer; And forming an electron transporting layer on the photoactive layer. The method according to claim 1,
Wherein the electrospinning is performed by applying a voltage of 0.1 to 60 kV. The method according to claim 1,
The method of manufacturing an organic solar cell according to claim 1, wherein the substrate is transferred by a roll-to-roll method, and the coating solution is injected by electrospinning to form a slot die coating. An organic solar cell produced by the method for manufacturing an organic solar cell according to any one of claims 1 to 5.

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