KR101330505B1 - Dye-Sensitized Solar Cells Using The Dye - Google Patents

Abstract

The present invention can provide a dye for a dye-sensitized solar cell having the structure of formula (1).

Wherein X and Y are each independently a substituent consisting of a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, and a combination thereof, wherein at least one of X and Y is a fluorine group Wherein Z is a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, a vinyl group, a substituted or unsubstituted polyvinyl group, and A may be an acidic functional group.

Dye-sensitized solar cell

Description

Dye-Sensitized Solar Cells Using The Dye}

The present invention relates to a solar cell, and more particularly to a dye for a dye-sensitized solar cell.

Recently, various researches have been conducted to replace existing fossil fuels in order to solve the energy problem. In particular, various studies have been conducted to utilize natural energy such as wind, nuclear power, and solar power to replace petroleum resources that will be exhausted within decades.

Unlike other energy sources, solar cells are environmentally friendly based on the infinite resource of the sun. Since the development of Si solar cells in 1983, solar cells have recently been in the spotlight due to the global energy shortage.

However, such silicon solar cell has a fierce competition among countries due to the supply and demand of raw materials of Si, which makes the production cost expensive. In order to solve this problem, many research institutes in Korea and abroad have suggested self-measurement. One solution to this severe energy shortage is the dye-sensitized solar cell, which was developed by Dr. Micheal Graetzel of the Swiss National Lausanne Institute of Advanced Technology (EPFL) in 1991. Since its inception, research has been underway at many research institutes.

Dye-sensitized solar cells, unlike silicon solar cells, contain photosensitive dye molecules capable of absorbing visible light to produce electron-hole pairs, and transition metal oxides for transferring the generated electrons. It is a photoelectrochemical solar cell. Representative research and development among conventional dye-sensitized solar cells include dye-sensitized solar cells using nanoparticle titanium oxide.

This dye-sensitized solar cell has the advantage of being cheaper to manufacture than conventional silicon solar cells and applicable to glass windows or glass greenhouses for building exterior walls due to transparent electrodes, but research is needed to proceed further due to low photoelectric conversion efficiency. .

Since the photoelectric conversion efficiency of solar cells is proportional to the amount of electrons generated by the absorption of sunlight, in order to increase the efficiency, the amount of dye adsorption is increased by increasing the amount of dye adsorption on the titanium oxide nanoparticles, and the absorption of sunlight is increased. In addition, the generated exciton must be prevented from disappearing by electron-hole recombination.

In order to increase the amount of dye adsorption per unit area, particles of oxide semiconductor should be manufactured in the size of nanometer, and method of manufacturing by increasing the reflectance of platinum electrode or mixing several micro-sized semiconductor oxide light scatterers to increase the absorption of sunlight. Etc. have been developed.

However, such a conventional method has a limitation in improving the photoelectric conversion efficiency of the solar cell, and thus there is an urgent need for developing a new technology for improving the efficiency.

The present invention provides a dye for a photosensitive solar cell dye having excellent photoelectric conversion efficiency and lifetime characteristics and a solar cell comprising the same.

In order to achieve the above object, the dye for a dye-sensitized solar cell according to an embodiment of the present invention may have a structure of the formula (1).

[Formula 1]

Wherein X and Y are each independently a substituent consisting of a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, and a combination thereof, wherein at least one of X and Y is a fluorine group Wherein Z is a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, a vinyl group, a substituted or unsubstituted polyvinyl group, and A may be an acidic functional group.

X and Y are each independently a substituted or unsubstituted aromatic hydrocarbon group having 5 to 20 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group and a combination thereof, wherein at least one of the X and Y May comprise a flu rise.

X and Y may include a substituent selected from the group consisting of alkyl, alkoxy, aryl group, arylene group, alkylene group and combinations thereof.

Z may include a substituent selected from the group consisting of thiophene, vinyl group, polyvinyl group, benzene, naphthalene, anthracene, fluorene, biphenyl, pyran, pyrrole, carbazole and combinations thereof.

Z may be a substituent selected from the group consisting of alkyl, alkoxy, aryl group, alkenyl group, arylene group, alkylene group and combinations thereof.

A may include a substituent selected from the group consisting of a carboxyl group, a phosphorous acid group, a sulfonic acid group, a phosphinic acid group, a hydroxy group, an oxycarboxylic acid, an acid amide, and a combination thereof.

X-N-Y may be any one of the following compounds.

Wherein R is H or an alkyl group or trimethylsilyl group which is C1 to C8,

Wherein R is H, F or an alkyl group or trimethylsilyl group which is C1 to C8,

Here, R ₁ and R ₂ may be H or an alkyl group, alkoxy group, alkenyl group which is C1 to C8.

In addition, the dye-sensitized solar cell according to an embodiment of the present invention may include the dye disclosed above.

The present invention provides a dye for a photosensitive solar cell dye having excellent photoelectric conversion efficiency and lifetime characteristics and a solar cell comprising the same.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a dye-sensitized solar cell according to an embodiment of the present invention.

Referring to FIG. 1, the dye-sensitized solar cell 100 has a sandwich structure in which the first electrode 120 and the second electrode 140 are bonded to each other, and more specifically, the first electrode on the first substrate 110. 120 may be positioned, and the second electrode 140 may face each other on the second substrate 150 facing the first electrode 120.

The light absorption layer 130 including the electrolyte 131, the semiconductor fine particles 132, and the dye 133 adsorbed to the semiconductor fine particles 132 is positioned between the first electrode 120 and the second electrode 140. can do.

The first substrate 110 may be made of glass or plastic, and is not particularly limited as long as the material has transparency to allow incidence of external light. Here, specific examples of the plastic include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polypropylene (PP), polyimide (PI), traacetyl cellulose (TAC) or copolymers thereof Etc. can be mentioned.

Here, the first substrate 110 may be doped with a material selected from the group consisting of titanium, indium, gallium, and aluminum.

The first electrode 120 may include a conductive metal oxide layer.

The conductive metal oxide film may be formed of indium tin oxide (ITO), fluorine tin oxide (FTO), ZnO- (Ga ₂ O ₃ or Al ₂ O ₃ ), tin oxide, antimony tin oxide (ATO), zinc oxide ( ZnO) and mixtures thereof, and more preferably F: SnO ₂ can be used.

The light absorption layer 130 may include an electrolyte 131, semiconductor fine particles 132, and a dye 133.

The electrolyte 131 may be a redox electrolyte. Specifically, a halogen redox electrolyte composed of a halogen compound having a halogen ion as a counter ion and a halogen molecule, a ferrocyanate-ferrocyanate or ferrocene-ferric Metal redox electrolytes such as metal complexes such as nium ions and cobalt complexes, organic redox electrolytes such as alkylthiol-alkyldisulfides, viologen dyes, and hydroquinone-quinones; Electrolytes are preferred.

As a halogen molecule in a halogen redox electrolyte composed of halogen compound-halogen molecules, an iodine molecule is preferable. In addition, the halogen compound to a halogen ion as a counter ion LiI, NaI, CaI _2, MgI _2, a halogenated metal salt such as CuI, or tetra-alkyl ammonium iodine, imidazolium iodine, the organic ammonium salt of halogen such as flutes Stadium iodine, or I ₂ can be used.

In addition, when the redox electrolyte is configured in the form of a solution containing the same, the solvent may be a battery chemically inert. Specific examples include acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxy propionitrile, methoxy acetonitrile, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, butyrolactone, dimethoxyethane, dimethyl carbonate, 1,3-dioxolane, methylformate, 2-methyltetrahydrofuran, 3-methoxy-oxazolidin-2-one, sulfolane, tetrahydrofuran, water, and the like, in particular acetonitrile, Propylene carbonate, ethylene carbonate, 3-methoxy propionitrile, ethylene glycol, 3-methoxy-oxazolidin-2-one, butyrolactone and the like are preferable. These solvents may be used alone or in combination.

The semiconductor fine particles 132 may be a compound semiconductor or a compound having a perovskite structure in addition to the single semiconductor represented by silicon.

The semiconductor may be an n-type semiconductor in which conduction band electrons are carriers to provide an anode current under optical excitation, and the compound semiconductor may be titanium, tin, zinc, tungsten, zirconium, gallium, indium, yttrium, niobium, tantalum, Metal oxides selected from the group consisting of vanadium can be used. Preferred examples thereof include titanium oxide, tin oxide, zinc oxide, niobium oxide, titanium strontium oxide, or a mixture thereof. More preferably, anatase type titanium oxide can be used. The kind of the semiconductor is not limited to these, and these may be used alone or in combination of two or more thereof.

In addition, the particle diameter of the semiconductor fine particles 132 may be an average particle diameter of 1 to 500nm, preferably 1 to 100nm. In addition, the semiconductor fine particles 132 may be mixed with a large particle size and a small particle size, or may be used in multiple layers.

The semiconductor fine particles 132 are obtained by forming the semiconductor fine particles into a thin film directly on the substrate by spray spraying or the like, by depositing a thin film of the semiconductor fine particles electrically using the substrate as an electrode, or by hydrolyzing a slurry of the semiconductor fine particles or a precursor of the semiconductor fine particles. After apply | coating the paste containing the microparticles | fine-particles which can be made to a board | substrate, it can manufacture by the method of drying, hardening, or baking.

The dye 133 that absorbs external light and generates excitation electrons may be adsorbed on the surface of the semiconductor fine particles 132.

The light absorption layer 130 may have a thickness of 15 μm or less, preferably 1 to 15 μm.

The second electrode 140 may be positioned on the light absorption layer 130. The second electrode 140 may include a transparent electrode 141 and a catalyst electrode 142.

The transparent electrode 141 may be made of a transparent material such as indium tin oxide, fluorine oxide, antimony tin oxide, zinc oxide, tin oxide, or ZnO- (Ga ₂ O ₃ or Al ₂ O ₃ ).

The catalyst electrode 142 activates a redox couple, and may use conductive materials such as platinum, gold, ruthenium, palladium, rhodium, iridium, osmium, carbon, titanium oxide, and a conductive polymer. have.

In addition, for the purpose of improving the catalytic effect of redox, the catalyst electrode 142 facing the first electrode 120 preferably has a microstructure and can increase its surface area. For example, in the case of lead or gold, it is preferable to be in a black state, and in the case of carbon, it is preferably in a porous state. Particularly, the platinum black state can be formed by platinum anodization, platinum chloride treatment, or the like, and the carbon in the porous state can be formed by sintering carbon fine particles or firing organic oligomers.

The second substrate 150 may be made of glass or plastic in the same manner as the first substrate 110 described above. Specific examples of the plastic include polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyimide, triacetyl cellulose, and the like.

When sunlight enters into the dye-sensitized solar cell 100 having such a structure, photons are first absorbed by the dye 133 in the light absorption layer 130, and thus, the dye 133 transitions from the ground state to the excited state. To form an electron-hole pair, and the excited electrons are injected into a conduction band of the interface of the semiconductor fine particles 132, and the injected electrons are transferred to the first electrode 120 through the interface. It moves to the second electrode 140 which is the counter electrode.

On the other hand, the dye 133 oxidized as a result of the electron transition is reduced by the ions of the redox couple in the electrolyte 131, the oxidized ions of the second electrode 140 to achieve charge neutrality (charge neutrality) The dye-sensitized solar cell 100 operates by performing a reduction reaction with the electrons reaching the interface.

Hereinafter, the dye 133 used in the dye-sensitized solar cell 100 according to an embodiment of the present invention will be described in detail.

Dye-sensitized solar cell dye according to an embodiment of the present invention may have a structure of formula (1).

[Formula 1]

Wherein X and Y are each independently a substituent consisting of a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, and a combination thereof, wherein at least one of X and Y is a fluorine group Wherein Z is a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted heterocyclic group, a vinyl group, a substituted or unsubstituted polyvinyl group, and A may be an acidic functional group.

Wherein X and Y are each independently a substituted or unsubstituted aromatic hydrocarbon group having 5 to 20 carbon atoms, a substituted or unsubstituted aromatic heterocyclic group, and a combination thereof, wherein at least one of X and Y Either one can contain a fluorine group.

Here, the heterocyclic group is preferably selected from a substituent consisting of pyran, pyrrole, thiophene, carbazole and combinations thereof.

X and Y may include a substituent selected from the group consisting of alkyl, alkoxy, aryl group, arylene group, alkylene group and combinations thereof.

The Z may include a substituent selected from the group consisting of thiophene, vinyl group, polyvinyl group, benzene, naphthalene, anthracene, fluorene, biphenyl, pyran, pyrrole, carbazole and combinations thereof.

Z may be a substituent selected from the group consisting of alkyl, alkoxy, aryl group, alkenyl group, arylene group, alkylene group and combinations thereof.

Here, the alkyl group may be composed of a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, and the alkoxy group may be an oxygen-containing substituted or unsubstituted alkoxy group having an alkyl group having 1 to 20 carbon atoms. The aryl group may be used alone or in combination, and may be a carbocycle aromatic compound having 6 to 30 carbon atoms including one or more rings such as phenyl, naphthyl, tetrahydronaphthyl or biphenyl. The alkylene group may have a radical form in which both ends of the alkyl group can be bonded, wherein the alkyl group is as described above.

A may include a substituent selected from the group consisting of a carboxyl group, a phosphorous acid group, a sulfonic acid group, a phosphinic acid group, a hydroxy group, an oxycarboxylic acid, an acid amide, and a combination thereof.

X-N-Y may be any one of the following compounds.

Wherein R is H or an alkyl group or trimethylsilyl group which is C1 to C8,

Wherein R is H, F or an alkyl group or trimethylsilyl group which is C1 to C8,

Here, R ₁ and R ₂ may be H or an alkyl group, alkoxy group, alkenyl group which is C1 to C8.

Hereinafter, a preferred embodiment will be described to facilitate understanding of the present invention. However, the following examples are illustrative of the present invention, but the present invention is not limited to the following examples.

Example 1 Synthesis of Dye

Through the following reaction, a dye for a dye-sensitized solar cell of the present invention was synthesized.

1) Preparation of 4-butyl-N- (2,4-difluorophenyl) benzeneamine

44 mmol of 2,4-difluoroaniline, 30 mmol of 1-bromo-4-butylbenzene, 0.4 mmol of palladium (II) acetate, in 250 ml tri-neck-round bottom flask, 2,2'-bis (diphenyl After dissolving 0.9 mmol of phosphino) -1,1'-vinaphthyl and 44 mmol of potassium-tertiary-butoxide in 100 mL of toluene, the mixture was stirred for 24 hours in a bath at 100 ° C, and then toluene was removed. Extraction using dichloromethane and water and distillation under reduced pressure followed by silica gel column chromatography followed by distillation of the solvent under reduced pressure yielded 0.3 g of 4-butyl-N- (2,4-difluorophenyl) benzeneamine liquid.

2) Preparation of 4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino) benzaldihydr

30 mmol of 4-butyl-N- (2,4-difluorophenyl) benzeneamine in a 250 ml tri-neck-round bottom flask, 34 mmol of 4-bromobenzaldihydr, tris (dibenzylideneacetone) dipalladium (O ) 0.5 mmol, 0.9 mmol of tris-tertiary-butyl phosphine, and 40 mmol of sodium tertiary-butoxide were dissolved in 100 mL of toluene, stirred for 24 hours in a bath at 100 ° C, and then toluene was completed. After distilling off, the mixture was extracted with dichloromethane and water, followed by distillation under reduced pressure, followed by silica gel column chromatography. The solvent was distilled off under reduced pressure, and then 4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl). 7.1 g of) amino) benzaldihydr liquid was obtained.

3) Preparation of N- (4-butylphenyl) -N- (2,4-difluorophenyl) -4-(-2- (diophen-2-yl) vinyl) benzeneamine

In a 250ml tri-neck-round bottom flask equipped with a 100ml dropping funnel, 30mmol of sodium-tertiary-butoxide was dissolved in 100ml anhydrous tetrahydrofuran (anhydrous THF), followed by a solution of 27mmol of 100methyl triphenyl phosphonium salt. Went on slowly. When the color of the solution turns dark red and no further color change is observed, use 4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino) benzaldihydride in 30 ml of anhydrous. Dissolve in tetrahydrofuran and slowly add dropwise. After stirring for about 12 hours at room temperature, anhydrous tetrahydrofuran was removed, the silica gel column was distilled off using dichloromethane and n-hexane, and the solvent was distilled off under reduced pressure, and the mixture was recrystallized using dichloromethane and n-hexane to filter. 8.4 g of solid, which is-(4-butylphenyl) -N- (2,4-difluorophenyl) -4-(-2- (thiophen-2-yl) vinyl) benzeneamine, was obtained.

4) Preparation of 5- (4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino) styryl) thiophene-2-carbal dihydride

In a 100 ml tri-neck-round bottom flask equipped with a 100 ml dropping funnel, 5 ml of DMF was dissolved in 30 ml anhydrous methylene chloride, and the flask was cooled to 0 ° C. using an ice bath and stirred. To the cooled solution, 26 mmol of phosphorus oxychloride was slowly added dropwise using a syringe, stirred at 0 ° C. for 30 minutes, and then raised to room temperature. 20 ml of anhydrous methylene with 17 mmol of N- (4-butylphenyl) -N- (2,4-difluorophenyl) -4-(-2- (thiophen-2-yl) vinyl) benzeneamine in a dropping funnel The solution was dissolved in chloride, injected using a syringe, slowly added dropwise to the solution, and the solution was heated to reflux. After about 12 hours, the temperature was lowered and 2N aqueous sodium hydroxide solution was added dropwise until neutral using pH paper. Extraction using dichloromethane and water and distillation under reduced pressure followed by silica gel column and distillation of the solvent under reduced pressure followed by 5- (4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino 3.5 g of) styryl) thiophene-2-carbaldehyde solids were obtained.

5) 3- (5- (4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino) styryl) thiophen-2-yl) -2-cyanoacrylic Manufacture of acid

2.9 m 5- (4- (N- (4-butylphenyl) -N- (2,4-difluorophenyl) amino) styryl) thiophene-2-carbaldehyde in a 100 ml tri-neck-round bottom flask Mole, 4.3 mmol of 2-cyanoacetic acid and 7 mmol of piperidine were dissolved in 50 mL of acetonitrile and refluxed for 12 hours. When the reaction is complete, the acetonitrile is removed and then dissolved in a small amount of dichloromethane. The silica gel column is followed by distillation of the solvent under reduced pressure. Precipitation in methanol is followed by filtration to give solid 3- (5- (4- (N- (4-butyl). 2.1 g of phenyl) -N- (2,4-difluorophenyl) amino) styryl) thiophen-2-yl) -2-cyanoacrylic acid was obtained.

Example 2 Preparation of Dye-Sensitized Solar Cell

(1) working electrode fabrication

The FTO glass (Florine-doped tin oxide coated conduction glass, Pilkington, TEC7) was cut into 1.5 cm × 1.5 cm in size and ultrasonically cleaned with a glass cleaning detergent for 10 minutes, and then the soapy water was completely removed using distilled water. Thereafter, ultrasonic disintegration washing with ethanol was repeated twice for 15 minutes. It was then rinsed thoroughly with anhydrous ethanol and dried in an oven at 100 ° C. In order to improve the contact force with TiO ₂ on the thus prepared FTO glass, soaked in 40 mM titanium (IV) chloride solution at 70 ℃ 40 minutes, washed with distilled water, and then completely dried at 100 ℃ oven. Thereafter, Titania (TiO ₂ ) paste (18-NR) from CCIC was coated on a FTO glass using a 9 mm x 9 mm mask (200 mesh) with a screen printer. The coated film was dried in an oven at 100 ° C. for 20 minutes and the process was repeated three times. Thereafter, the coated film was baked at 450 ° C. for 60 minutes to obtain a TiO ₂ film having a thickness of about 10 μm. The dye can be adsorbed by soaking the TiO ₂ film after the heat treatment in a dry ethanol solution of the synthesized dye at a concentration of 0.5 mM for 24 hours. (At this time, if the dye is not dissolved in anhydrous ethanol, a solvent that can be dissolved may be used.) After the adsorption is complete, the dye that was not adsorbed with anhydrous ethanol was washed thoroughly and dried using a heat gun.

(2) counter electrode fabrication

Two holes into the electrolyte were drilled in a 1.5 cm × 1.5 cm FTO glass using a Φ 0.7 mm diamond drill (Dremel multipro395). Thereafter it was washed and dried in the same manner as the washing method presented in the working electrode. Thereafter, hydrogen hexachloroplatinate (H ₂ PtCl ₆ ) 2 -propanol solution was coated on FTO glass, and then fired at 450 ° C. for 60 minutes.

(3) sandwich cell fabrication

A rectangular strip-shaped Shrin (SX1170-25 Hot Melt) was placed between the working electrode and the counter electrode, and the two electrodes were bonded together using a clip and an oven, and electrolyte was injected through two small holes in the counter electrode. After that, a sandwich cell was manufactured by sealing with shrin rip and cover glass. In this case, as the electrolyte solution, 3-Methylpropiodine with 0.1M Lil, 0.05M ₂ , 0.6M 1-hexyl-2,3-dimethylimideazolidium iodide and 0.5M 4-tertiary-butylpyridine Prepared with nitrile solvent.

(4) Photocurrent-Voltage Measurement

The sandwich cell prepared above was irradiated with an Xe lamp (Oriel, 300W Xe arc lamp) equipped with an AM 1.5 solar simulating filter to obtain a current-voltage curve using an M236 source measure unit (SMU, Keithley). The range of electric potential was -0.8V to 0.2V, and the light intensity was 100mW / cm <2>.

Hereinafter, experimental examples of manufacturing a solar cell manufactured according to the above-described embodiments will be disclosed.

<Experimental Example 1>

The solar cell was manufactured using the dye represented by following formula (2).

<Experimental Example 2>

The solar cell was manufactured using the dye represented by following formula (3).

<Experimental Example 3>

The solar cell was manufactured using the dye represented by following formula (4).

<Comparative Example>

The solar cell was manufactured using the dye represented by following formula (5).

Measuring the short-circuit photocurrent density (J _sc ), open circuit voltage (V _oc ), fill factor (FF), photoelectric conversion efficiency (PCE) of the dye-sensitized solar cells prepared according to Experimental Examples 1 to 3 and Comparative Examples It is shown in Table 1 below. In this case, the experimental examples and comparative examples were measured twice under the same conditions.

# Area (㎠) J _sc (mA) V _oc (V) FF (%) PCE (%) Experimental Example 1
One 0.266 12.73 0.634 72.32 5.85 2 0.272 12.97 0.644 70.34 5.87 Experimental Example 2
One 0.275 12.14 0.650 71.88 5.67 2 0.270 12.31 0.655 71.16 5.74 Experimental Example 3
One 0.271 11.29 0.630 70.62 5.03 2 0.272 11.96 0.658 72.45 5.70 Comparative Example
One 0.270 16.21 0.659 71.4 8.90 2 0.270 15.9 0.679 71.0 8.52

As shown in Table 1, the solar cell manufactured according to Experimental Examples 1 to 3 of the present invention shows an open voltage (V _oc ) according to the comparative example, Comparative Example using a dye (N719) with the highest efficiency to date. The photoelectric conversion efficiency (PCE) was about 80%.

Therefore, the dye-sensitized solar cell dye and the solar cell including the same according to an embodiment of the present invention is much cheaper than the conventional organic metal-based solar cell manufacturing cost and shows a photoelectric conversion efficiency equivalent to that of the organic metal-based dye There is an advantage that the service life can be improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1 is a view showing a dye-sensitized solar cell according to an embodiment of the present invention.

Claims (8)

Dye-sensitized solar cell dye having a structure of any one of the following formulas (2) to (4). (2)

(3)

[Formula 4]

delete delete delete delete delete delete The dye-sensitized solar cell containing the dye of Claim 1.

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