KR101207987B1 - Counter electrode for dye-sensitized solar cell and dye-sensitized solar cell including the same - Google Patents

Abstract

PURPOSE: A counter electrode for a dye-sensitized solar cell and dye-sensitized solar cell including the same are provided to produce a catalytic substance which can is a substitute for expensive metal by using relatively low cost of graphene or a graphene oxide. CONSTITUTION: A conductive layer(120) comprises an inorganic material layer(121) and a metal layer(123). The metal layer is formed on the inorganic material layer. The metal layer includes conductive metal. The inorganic material layer includes one which is selected from graphene and a graphene oxide. A substrate is formed on the conductive layer.

Description

Counter electrode for dye-sensitized solar cell and dye-sensitized solar cell including same TECHNICAL FIELD [0001] DYE-SENSITIZED SOLAR CELL AND DYE-SENSITIZED SOLAR CELL INCLUDING THE SAME}

The present application relates to a dye-sensitized solar cell counter electrode and a dye-sensitized solar cell including the same, and more particularly, to a dye-sensitized solar cell counter electrode using graphene and a metal and a dye-sensitized solar cell including the same.

Solar cells can be roughly divided into solar cells and solar cells. Solar thermal electricity is a device that generates the steam needed to rotate a turbine using solar heat, and photovoltaic solar cells convert the photons into electrical energy using the properties of semiconductors. Device.

Among them, as the solar cell, the most widely developed and actually used solar cell in the world is a silicon (Si) -based solar cell, and the silicon-based solar cell is formed by a diffusion method using a pn junction. It is made by semiconductor process.

However, the efficiency of single-crystal silicon-based solar cells with efficiency of up to 30% has already reached the theoretical limit, and the silicon-based solar cells and Cu-based and Cd-based materials used in them are high in manufacturing cost and environmental. There is a technical problem of using harmful chemicals. In addition, silicon-based solar cells have a high production cost of 3 ~ 4 $ / Wp, and is facing difficulties in full-scale commercialization because of limited application.

To replace these silicon-based solar cells, dye-sensitized solar cells with low manufacturing prices and high energy efficiency (~ 11%) are emerging. Dye-sensitized solar cells are representative organic solar cells using solar energy, and are solar cells that generate chemical power generation by utilizing the solar absorption ability of dyes. Specifically, the dye-sensitized solar cell includes a photoelectrode including a photosensitive dye layer, a counter electrode facing the photoelectrode, and an electrolyte located between the photoelectrode and the counter electrode, and reaching the photosensitive dye layer. The electron which forms the electron transfer channel which the electron excited from the photosensitive dye layer by one light passes through a photoelectrode and a counter electrode, and is supplied back to a photosensitive dye layer through the reduction and oxidation of electrolyte by the catalytic reaction of a counter electrode. It is a battery.

Dye-sensitized solar cells not only use environmentally harmless materials, but also have energy conversion efficiency comparable to that of conventional silicon solar cells, but the manufacturing cost is only one fifth of that of silicon-based solar cells. In addition, it can be designed to operate at low temperatures compared to silicon solar cells, there is no concern of toxic gas emission during the manufacturing process, and less sensitive to partial shading, which is more practical than silicon-based solar cells.

In spite of many of these advantages, the full-scale commercialization of dye-sensitized solar cells should solve the problems of portability, applicability to various types of surfaces, stability to enable long-term operation, and higher efficiency. To this end, the development of economical and effective counter electrode, photoelectrode and development of stable electrolyte have emerged as a problem to be solved.

Particularly, in the case of the counter electrode, platinum is mainly used as a counter electrode. However, platinum is expensive and has a limitation in forming a large area compared with a general conductive material, and in the case of forming a thick film to improve electrical conductivity, There is a problem that the manufacturing cost rises sharply and the long-term stability decreases due to denaturation.

Accordingly, the present invention has been made to solve the problems of the prior art as described above and the technical problem that has been requested from the past, the first object of the present invention is a conductive but relatively inexpensive and electrochemically stable graphene or graphene oxide The present invention provides a metal / graphene composite counter electrode in which a metal is complexed to compensate for a relatively insufficient catalytic property.

The second object of the present invention is to provide a dye-sensitized solar cell that can provide excellent device efficiency for electro-optical energy while maintaining the long-term stability because the counter electrode.

As a technical means for achieving the above technical problem, one aspect of the present invention, any one selected from graphene, graphene oxide and mixtures thereof; And it provides a counter electrode for a dye-sensitized solar cell, including a conductive layer comprising a conductive metal.

Wherein the conductive layer, the inorganic layer including any one selected from the graphene, graphene oxide and mixtures thereof; And a metal layer formed on the inorganic layer and including the conductive metal.

In addition, the conductive layer may be formed by mixing any one selected from the graphene, graphene oxide and a mixture thereof and the conductive metal.

In addition, the counter electrode for the dye-sensitized solar cell may further include a substrate on the conductive layer .

In addition, the substrate is fluorine-doped tin oxide (FTO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), indium tin oxide-silver-indium Tin oxide (ITO-Ag-ITO), indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc tin oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO) and aluminum zinc oxide- It may be formed including one or more conductive oxides selected from the group consisting of silver-aluminum zinc oxide (AZO-Ag-AZO).

In addition, the substrate may be nickel, stainless steel, zinc-coated carbon steel, plain carbon steel, copper, titanium, zinc, or zinc. And it may be a metal foil (metal foil) or a metal sheet (metal sheet) formed by including one or more selected from the group consisting of steel (steel).

In addition, the substrate is made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polyethersulfone (PES), polycarbonate (PC), polyarylate (PAR) and polyimide (PI) It may be formed including one or more selected from the group.

In addition, the metal may be any one selected from the group consisting of gold (Au), palladium (Pd), platinum (Pt), ruthenium (Ru), and alloys thereof.

Another aspect of the present invention includes a photoelectrode, a counter electrode positioned to face the photoelectrode, and an electrolyte disposed between the photoelectrode and the counter electrode, wherein the photoelectrode includes a first substrate and the first substrate. It includes a photosensitive dye layer formed on one substrate, the counter electrode is any one selected from graphene, graphene oxide and mixtures thereof; And a conductive metal; provides a dye-sensitized solar cell comprising a conductive layer comprising a.

In the dye-sensitized solar cell, the conductive layer is an inorganic layer comprising any one selected from the graphene, graphene oxide and mixtures thereof; and a metal layer formed on the inorganic layer and containing the conductive metal; It may include.

In the dye-sensitized solar cell, the conductive layer may be formed by mixing any one selected from the graphene, graphene oxide and a mixture thereof with the conductive metal.

The dye-sensitized solar cell may further include a second substrate on the conductive layer, and the second substrate may be positioned to face the first substrate.

Another aspect of the invention provides an electronic device comprising the dye-sensitized solar cell.

The electronic device may be one selected from the group consisting of a display, a digital camera, a mobile phone, and a portable computer.

Another aspect of the present invention provides a building material comprising the dye-sensitized solar cell.

The present invention can provide a metal / graphene composite counter electrode in which a metal is complexed to compensate for a catalytic property which is relatively insufficient in conductive and electrochemically stable graphene or graphene oxide.

In another aspect, the present invention can provide a composite relative electrode having the conductivity of the graphene by partially thermally reducing the graphene oxide to be applied to the composite relative electrode.

In another aspect, the present invention can provide a metal / graphene composite counter electrode having a transparency equivalent to the metal counter electrode of the dye-sensitized solar cell and higher energy conversion efficiency than the metal counter electrode.

In addition, the present invention can provide a catalytic material that can replace expensive metals by using relatively inexpensive graphene or graphene oxide.

In addition, since the present invention includes the counter electrode, it is possible to provide a dye-sensitized solar cell capable of providing excellent device efficiency for electro-electro-optic energy while maintaining long-term stability.

1 is a cross-sectional view of a counter electrode for a dye-sensitized solar cell according to an embodiment of the present invention.
2 is a cross-sectional view of a counter electrode for a dye-sensitized solar cell according to an embodiment of the present invention.
3 is a cross-sectional view of a counter electrode for a dye-sensitized solar cell according to an embodiment of the present invention.
4 is a cross-sectional view of a counter electrode for a dye-sensitized solar cell according to an embodiment of the present invention.
5 is a cross-sectional view of the dye-sensitized solar cell according to an embodiment of the present invention.
6 is a cross-sectional view of the dye-sensitized solar cell according to an embodiment of the present invention.
7 is a cross-sectional view of the dye-sensitized solar cell according to an embodiment of the present invention.
8 is a cross-sectional view of the dye-sensitized solar cell according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of a dye-sensitized solar cell counter electrode and a dye-sensitized solar cell including the same according to the present invention will be described in detail with reference to the accompanying drawings. The numbering and duplicate description thereof will be omitted.

However, the following description is not intended to limit the present invention to specific embodiments, and it is to be understood that the present invention includes all conversions, equivalents, and substitutes included in the spirit and technical scope of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Furthermore, terms including an ordinal number such as first, second, etc. to be used below can be used to describe various elements, but the constituent elements are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In addition, when a component is referred to as being "formed" or "laminated" on another component, it may be directly attached to, or laminated to, the front or one side on the surface of the other component, but the intermediate It will be understood that other components may exist in the.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

1 to 4, as technical means for achieving the above-described technical problem, one aspect of the present invention,

Provided is a counter electrode 100 for a dye-sensitized solar cell, including a conductive layer 120 including any one selected from graphene, graphene oxide, and a mixture thereof, and a conductive metal.

According to an embodiment of the present invention, the conductive layer 120 in Figure 1,

Inorganic layer 121 including any one selected from the graphene, graphene oxide and mixtures thereof: And

And a metal layer 123 formed on the inorganic layer 121 and including the conductive metal.

According to an embodiment of the present invention, in FIG. 2, the conductive layer 120 may be formed by mixing any one selected from the graphene, graphene oxide, and a mixture thereof with the conductive metal. Here, when the volume of graphene and / or graphene oxide is larger than that of the conductive metal, the conductive metal may be dispersed in domains in the graphene and / or graphene oxide matrix, and conversely, graphene and / or graphene oxide When the volume of is smaller than the volume of the conductive metal, graphene and / or graphene oxide may be dispersed in domains in the conductive metal matrix.

3 and 4, the counter electrode 100 for the dye-sensitized solar cell may further include a substrate 110 on the conductive layer 120.

According to an embodiment of the present invention, fluorine-doped tin oxide (FTO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), Indium Tin Oxide-Silver-Indium Tin Oxide (ITO-Ag-ITO), Indium Zinc Oxide-Silver-Indium Zinc Oxide (IZO-Ag-IZO), Indium Zinc Tin Oxide-Silver-Indium Zinc Tin Oxide (IZTO-Ag- IZTO) and aluminum zinc oxide-silver-aluminum zinc oxide (AZO-Ag-AZO) may be used including one or more conductive oxides selected from the group consisting of, but are not limited thereto.

In addition, according to an embodiment of the present invention, the substrate is nickel (stainless steel), zinc-coated carbon steel (zinc-coated carbon steel), pure carbon steel (plain carbon steel), copper (copper), titanium (titanium), zinc (zinc) and steel (steel) may be a metal foil (metal foil) or a metal sheet (metal sheet) formed by including one or more selected from the group consisting of, the type of metal is limited thereto It is not.

In addition, according to an embodiment of the present invention, the polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polyethersulfone (PES), polycarbonate (PC), polyarylate (PAR) as the substrate And polyimide (PI), and may include one or more selected from the group consisting of, but is not limited thereto. In this case, the substrate may be applied to flexible electronic devices such as e-paper, for example. .

In addition, according to an embodiment of the present invention, gold (Au), palladium (Pd), platinum (Pt), ruthenium (Ru) or an alloy thereof may be used as the metal, but is not limited thereto.

5 and 6, one aspect of the present invention includes a photoelectrode 300, a counter electrode 100 positioned to face the photoelectrode 300, and the photoelectrode 300 and the counter electrode ( And an electrolyte 200 interposed between 100,

The photoelectrode 300 includes a first substrate 360 and a photosensitive dye layer 350 formed on the first substrate 360.

The counter electrode 100 is any one selected from graphene, graphene oxide, and mixtures thereof; And it provides a dye-sensitized solar cell 20, comprising a conductive layer (120, 121, 123) comprising a conductive metal.

According to an embodiment of the present invention, the conductive layers 121 and 123 of the dye-sensitized solar cell 20 in FIG.

Inorganic layer 121 including any one selected from the graphene, graphene oxide and mixtures thereof: And

And a metal layer 123 formed on the inorganic layer 121 and including the conductive metal.

According to an embodiment of the present invention, in FIG. 6, the conductive layer 120 of the dye-sensitized solar cell 20 is formed by mixing any one selected from the graphene, graphene oxide, and a mixture thereof with the conductive metal. Can be.

According to the exemplary embodiment of the present invention, the dye-sensitized solar cell 20 further includes a second substrate 110 on the conductive layer 120 in FIG. 7 and 8, and the second substrate 110 is formed as described above. The substrate may be positioned to face the first substrate 360.

As described above, embodiments of the dye-sensitized solar cell of the present invention have various forms, such as a monolithic type in which the substrate is used only on one of the photoelectrodes or the counter electrode, and a form in which both the photoelectrodes and the counter electrode are used. It may include but is not limited to.

In addition, the embodiment of the dye-sensitized solar cell of the present invention may be a form in which the unit dye-sensitized solar cell is modularized into a plurality of cells, but is not limited thereto.

The electrolyte 200 may be sealed by an encapsulant or sealant positioned between the first substrate 360 and the second substrate 110. The encapsulant or sealant may be made of a thermoplastic resin or a thermosetting resin.

The conductive layer, the graphene, the graphene oxide, the inorganic layer, the conductive metal, the metal layer, and the substrate (the first substrate or the second substrate) used in the dye-sensitized solar cell 20 of the present invention are as described in the counter electrode of the present invention. The same may be used, and a description thereof will be omitted.

More specific structure of the dye-sensitized solar cell and its manufacturing method are known in the art, and thus a detailed description thereof will be omitted herein.

The present invention also provides an electronic device including the dye-sensitized solar cell.

Examples of the electronic device include a display, a digital camera, a mobile phone, a portable computer, and the like, but are not limited thereto. In particular, the electronic device may be used as a mobile electronic device that is portable.

The present invention also provides a building material comprising the dye-sensitized solar cell.

Examples of the building material include, but are not limited to, building exterior materials, glass, resin molded products, signs, lighting devices, and the like, which are used for exterior walls of buildings.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

[Example]

Manufacturing example  One: Graphene oxide  Solution preparation

Graphite was pulverized in a ball mill for 10 minutes at 1 minute to prepare a powder having a diameter of 10 μm or less, and then 3 g of graphite powder crushed in 100 ml of an aqueous solution containing sulfuric acid (H ₂ SO ₄ ): deionized water at a weight ratio of 1:50. After mixing and stirring at room temperature for 2 hours, 10 g of potassium permanganate (KMnO ₄ ) was added at room temperature and oxidized, followed by reacting for 5 hours by adding distilled water at 70 ° C. Then 30 ml of aqueous hydrogen peroxide (H ₂ O ₂ ) solution was added to terminate the reaction, washed with hydrochloric acid (HCl) and distilled water, and then sonicated for 2 hours in a dispersed state in an aqueous solution to finally obtain a graphene oxide solution. It was.

Manufacturing example  2: Preparation of Platinum Precursor Solution

8wt% H ₂ PtCl ₆ The aqueous solution was diluted with distilled water to prepare a 0.08 wt% H ₂ PtCl ₆ solution.

Manufacturing example  3: Graphene oxide  Manufacture of platinum precursor mixed solution

0.1 g of the graphene oxide solution of Preparation Example 1 and 0.02 g of the platinum precursor solution of Preparation Example 2 were mixed by sonication for 20 minutes to prepare a mixed solution of graphene oxide and the platinum precursor.

Production Example 4 : Graphene oxide  Manufacture of platinum precursor mixed solution

0.1 g of the graphene oxide solution of Preparation Example 1 and 0.03 g of the platinum precursor solution of Preparation Example 2 were mixed to prepare a graphene oxide and a platinum precursor mixed solution by ultrasonic treatment for 20 minutes.

Manufacturing example  5: Preparation of platinum precursor solution for preparing standard platinum counter electrode

Anhydrous 2-propanol was added to H ₂ PtCl ₆ ˜6H ₂ O to a concentration of 7 mM and sonicated to prepare a platinum precursor solution.

Example  One

0.1 g of the graphene oxide solution of Preparation Example 1 was spin coated on a substrate (FTO) using a spin coater and dried at 80 ° C. for 10 minutes. In this manner, a graphene oxide layer-coated FTO substrate was prepared.

On the graphene oxide layer on the FTO substrate, 0.02 g of the platinum precursor solution of Preparation Example 2 was spin coated using a spin coater.

 The counter electrode was manufactured by firing the graphene oxide layer and the platinum precursor layer coated with the FTO substrate at 400 ° C. for 20 minutes.

In addition, one counter electrode was further manufactured in the same manner as in the above-described manufacturing method.

A dye-sensitized solar cell including a counter electrode prepared as described above was prepared. Specifically, the dye-sensitized solar cell forms a titanium oxide film on an FTO substrate and uses the titanium oxide film using a photosensitive dye purified N19 dye (Solaronix) 0.5 mM solution (solvent: acetonitrile, t-butyl alcohol). The photosensitive dye was adsorbed onto the photoelectrode to prepare a photoelectrode, and the counter electrode was laminated, respectively, and then a liquid electrolyte was injected to manufacture the dye-sensitized solar cell. The active area of the dye-sensitized solar cell is about 0.4 cm ² to be.

The voltage (Voc), the current density (Jsc), the fill factor and the light conversion efficiency (efficiency) of the dye-sensitized solar cell prepared as described above are shown in Table 1 below.

Example  2

On the graphene oxide layer on the FTO substrate as shown in Example 1, a dye was prepared in the same manner as in Example 1 except that a counter electrode was prepared by spin coating 0.03 g of a platinum precursor solution and baking at 400 ° C. for 20 minutes. A sensitized solar cell was prepared.

Example  3

Spinning the graphene oxide solution of Preparation Example 1 onto the FTO substrate and drying was repeated twice. A dye-sensitized solar cell was manufactured in the same manner as in Example 1, except that spin-coating 0.03 g of the platinum precursor solution of Preparation Example 2 on the graphene oxide layer was then baked at 400 ° C. for 20 minutes to prepare a counter electrode. .

Example  4

Using a mixed solution of Preparation Example 3 spin-coated 0.12g on the FTO substrate and baked for 20 minutes at 400 ℃ to prepare a counter electrode having a conductive layer in which the platinum domain is dispersed in a graphene oxide matrix and a dye-sensitized solar cell Prepared.

Example  5

Spin coating on the FTO substrate using 0.13 g of the mixed solution of Preparation Example 4 and sintering at 400 ° C. for 20 minutes to produce a counter electrode having a conductive layer in which platinum domains were dispersed in a graphene oxide matrix, and manufacturing a dye-sensitized solar cell. It was.

Comparative example  One

Two FTO substrates were prepared and used as a counter electrode, thereby manufacturing a dye-sensitized solar cell.

Comparative example  2

0.1 g of the graphene oxide solution of Preparation Example 1 was spin-coated on a substrate (FTO) using a spin coater and calcined at 400 ° C. for 20 minutes.

A counter electrode was manufactured from the graphene oxide layer-coated FTO substrate, and a dye-sensitized solar cell was prepared.

Comparative example  3

0.1 g of the graphene oxide solution of Preparation Example 1 was spin-coated to a substrate (FTO) using a spin coater, and dried at 80 ° C. for 10 minutes, followed by spin coating of 0.1 g of the graphene oxide solution one more time. A layer coated FTO substrate was prepared.

The graphene oxide layer-coated FTO substrate was calcined at 400 ° C. for 20 minutes to produce a counter electrode, and a dye-sensitized solar cell.

Comparative example  4

0.02 g of the platinum precursor solution of Preparation Example 2 was spin-coated on a substrate FTO using a spin coater.

The platinum precursor layer-coated FTO substrate was calcined at 400 ° C. for 20 minutes to prepare a counter electrode, and a dye-sensitized solar cell.

Comparative example  5

0.03 g of the platinum precursor solution of Preparation Example 2 was spin-coated on the substrate FTO using a spin coater.

The platinum precursor layer-coated FTO substrate was calcined at 400 ° C. for 20 minutes to produce a counter electrode, and a dye-sensitized solar cell was prepared.

Comparative example  6

In order to prepare a standard platinum counter electrode to be compared, 0.01 g of the platinum precursor solution of Preparation Example 5 was applied onto a substrate (FTO) using an eyedropper, and then baked at 400 ° C. for 20 minutes to prepare a counter electrode, and a dye-sensitized solar cell was prepared. Prepared.

Voc
(V) Jsc
(mA / cm2) FF
(%) Eff
(%) Amount of H ₂ PtCl ₆ in Solution
(μg)
Amount of graphene oxide in solution
(μg) Example 1 0.707 14.4 58.8 6.0 16.8 50.0 0.737 14.7 56.0 6.1 16.8 50.0 Example 2 0.717 16.3 62.1 7.3 24.8 50.0 0.737 15.9 64.7 7.6 24.8 50.0 Example 3 0.727 16.2 57.0 6.7 24.8 100.0 0.727 16.3 64.9 7.7 24.8 100.0 Example 4 0.707 15.1 53.5 5.7 16.8 50.0 0.707 14.2 37.5 3.8 16.8 50.0 Example 5 0.717 15.5 38.8 4.3 24.8 50.0 0.696 15.6 50.6 5.5 24.8 50.0 Comparative Example 1 0.372 1.7 8.8 0.06 0 0 0.474 1.1 8.5 0.04 0 0 Comparative Example 2 0.686 3.3 10.5 0.24 0 50 0.666 4.9 10.2 0.33 0 50 Comparative Example 3 0.686 2.5 10.5 0.18 0 100 Comparative Example 4 0.717 15.2 41.1 4.5 16.8 0 0.727 14.8 44.0 4.7 16.8 0 Comparative Example 5 0.727 14.1 52.9 5.4 24.8 0 0.737 14.5 50.0 5.3 24.8 0 Comparative Example 6 0.737 15.0 65.9 7.3 36.0 0

As shown in Table 1, according to the present invention, Example 1 is a dye-sensitized composite including a composite electrode formed by spin coating a graphene oxide layer on the substrate and sequentially spin coating a platinum precursor solution thereon. It is a solar cell. The dye-sensitized solar cell of Example 1 exhibited higher photoelectric conversion efficiency when comparing Example 1 and Comparative Example 4 having the same amount of platinum precursor added to the counter electrode of Example 1 but not adding graphene oxide. . When comparing Example 1 and Comparative Example 2, in which the amount of graphene oxide added to the counter electrode of Example 1 was the same but no platinum precursor was added, the dye-sensitized solar cell of Example 1 exhibited higher photoelectric conversion efficiency. It was. The photoelectric conversion efficiency of Comparative Example 2 (maximum value 0.33) and the photoelectric conversion efficiency of Comparative Example 4 (maximum value 4.7) are arithmetically summed (summing efficiency 5.03). Higher than that, it can be seen that the composite relative electrode is superior to the platinum precursor and graphene oxide, each counter electrode.

Example 2 is a dye-sensitized solar cell including a composite relative electrode using more platinum precursor solution than Example 1. Comparing Example 2 with Example 1, it can be seen that when a larger amount of platinum precursor solution is used, it shows higher photoelectric conversion efficiency. In Example 2, even though only about 69% of the platinum precursor was used compared to Comparative Example 6, it showed better photoelectric conversion efficiency. This means that by using the platinum precursor / graphene oxide composite electrode, the dye-sensitized solar cell can be manufactured at a lower cost while showing a better photoelectric efficiency.

Even when comparing Example 2 and Comparative Example 5, it can be seen that the performance of the dye-sensitized solar cell using the electrode composited with graphene oxide and the platinum precursor is superior to the case using only the platinum precursor.

Looking at Example 3 and Example 2, it can be seen that there is no significant difference in photoelectric conversion efficiency when the graphene oxide is coated twice, and twice the graphene oxide is used. This means that the catalytic role of graphene oxide alone is limited.

Example 4 and Example 5 are dye-sensitized solar cells including a metal / graphene composite counter electrode spin-coated a mixture of the graphene oxide solution and the platinum precursor solution, the amount of the platinum precursor used is different There was no significant difference in the dye-sensitized solar cell. In addition, Examples 4 and 5 show lower energy conversion efficiency than those of Examples 1 and 2 in which the graphene oxide solution and the platinum precursor solution were sequentially spin-coated to form respective metal layers and graphene oxide layers. By this, sequential spin coating is more preferable than mixing of each solution.

Compared with Comparative Example 1 using only FTO substrate as the counter electrode, Comparative Example 2 coated with graphene oxide once and Comparative Example 3 coated twice showed higher photoelectric conversion efficiency. This means that the graphene oxide plays an electrochemical catalyst role, but the difference between the comparative example 2 coated once and the comparative example 3 coated twice means that there is a limit to the electrochemical catalyst role of graphene oxide alone. I think it is.

Comparing Comparative Example 4 and Comparative Example 5, it can be seen that when a larger amount of platinum precursor is used, it shows better photoelectric conversion efficiency, which means that the platinum precursor solution plays an excellent electrochemical catalyst role. . This can also be seen through the comparison of Example 1 and Example 2.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (15)

Any one selected from graphene, graphene oxide, and mixtures thereof; And
A conductive layer comprising a conductive metal;
Further comprising a substrate on the conductive layer,
The substrate is fluorine-doped tin oxide (FTO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), indium tin oxide-silver-indium tin Oxide (ITO-Ag-ITO), indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc tin oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO) and aluminum zinc oxide-silver One or more conductive oxides selected from the group consisting of aluminum zinc oxide (AZO-Ag-AZO), or
Nickel, stainless steel, zinc-coated carbon steel, plain carbon steel, copper, titanium, zinc and steel A counter electrode for a dye-sensitized solar cell, which is a metal foil or metal sheet formed of one or more selected from the group consisting of The method of claim 1, wherein the conductive layer,
An inorganic layer including any one selected from the graphene, graphene oxide, and mixtures thereof; And
A metal layer formed on the inorganic layer and including the conductive metal;
A counter electrode for a dye-sensitized solar cell, comprising: The counter electrode of claim 1, wherein the conductive layer is formed by mixing any one selected from the graphene, the graphene oxide, and a mixture thereof with the conductive metal. delete delete delete delete The counterpart according to claim 1, wherein the metal is any one selected from the group consisting of gold (Au), palladium (Pd), platinum (Pt), ruthenium (Ru), and alloys thereof. electrode. A photoelectrode, a counter electrode positioned to face the photoelectrode, and an electrolyte disposed between the photoelectrode and the counter electrode,
The photoelectrode includes a first substrate and a photosensitive dye layer formed on the first substrate,
The counter electrode is any one selected from graphene, graphene oxide, and mixtures thereof; And a conductive layer comprising a conductive metal;
Further comprising a second substrate on the conductive layer, the second substrate is located opposite to the first substrate,
The second substrate is fluorine-doped tin oxide (FTO), indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), aluminum zinc oxide (AZO), indium tin oxide-silver- Indium tin oxide (ITO-Ag-ITO), indium zinc oxide-silver-indium zinc oxide (IZO-Ag-IZO), indium zinc oxide-silver-indium zinc tin oxide (IZTO-Ag-IZTO) and aluminum zinc oxide -Formed of one or more conductive oxides selected from the group consisting of silver-aluminum zinc oxide (AZO-Ag-AZO), or
Nickel, stainless steel, zinc-coated carbon steel, plain carbon steel, copper, titanium, zinc and steel Dye-sensitized solar cell is a metal foil (metal foil) or a metal sheet (metal sheet) formed by including one or more selected from the group consisting of. The method of claim 9, wherein the conductive layer
Inorganic layer comprising any one selected from the graphene, graphene oxide and mixtures thereof: And
A metal layer formed on the inorganic layer and including the conductive metal;
Dye-sensitized solar cell, characterized in that it comprises. The dye-sensitized solar cell of claim 9, wherein the conductive layer is formed by mixing any one selected from the graphene, graphene oxide, and a mixture thereof with the conductive metal. delete Electronic device comprising a dye-sensitized solar cell according to claim 9. The electronic device of claim 13, wherein the electronic device is one selected from the group consisting of a display, a digital camera, a mobile phone, and a portable computer. A building material comprising a dye-sensitized solar cell according to claim 9.

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