KR101623585B1 - Dye-Sensitized Solar Cells And Manufacturing Method For Thereof - Google Patents

Abstract

The present invention provides a liquid crystal display device comprising a first substrate including a first electrode, a light absorbing layer disposed on the first substrate, and a second substrate disposed on the light absorbing layer and including a second electrode, The present invention relates to a dye-sensitized solar cell comprising a plurality of semiconductor fine particles including a plurality of semiconductor fine particles, a scattering layer disposed on the plurality of semiconductor fine particles, and a plurality of catalyst particles disposed on the scattering layer.

Dye sensitization, solar cell

Description

Dye-Sensing Solar Cells and Manufacturing Method Thereof "

The present invention relates to a dye-sensitized solar cell, and more particularly, to a dye-sensitized solar cell having excellent efficiency and a method of manufacturing the same.

In recent years, various researches have been conducted to replace conventional fossil fuels in order to solve the energy problems encountered. Various researches have been conducted to utilize natural energy such as wind power, nuclear power, and solar power to replace petroleum resources that are depleted within several decades.

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

However, such silicon solar cells are highly competitive due to intense competition from the supply and demand of Si raw materials. In order to solve this problem, many research institutes in Korea and overseas are presenting self-help measures, but the reality is that they have difficulties. One of the possible solutions to this serious energy challenge is dye-sensitized solar cells, which were developed by Dr. Micheal Graetzel of the Swiss National Institute of Advanced Industrial Science and Technology in 1991 Since then, research has been conducted in many research institutes, attracting attention from academia.

Unlike silicon solar cells, dye-sensitized solar cells are mainly composed of photosensitive dye molecules capable of absorbing visible light to generate electron-hole pairs, and transition metal oxides transferring generated electrons as main constituent materials Photovoltaic solar cells. As a representative research and development among conventional dye-sensitized solar cells, there is a dye-sensitized solar cell using titanium oxide nanoparticles.

This dye-sensitized solar cell is advantageous in that it can be applied to a glass window or a glasshouse of a building due to a transparent electrode because the manufacturing cost is lower than that of a conventional silicon solar cell. However, the photoelectric conversion efficiency is low, .

Since the photoelectric conversion efficiency of a solar cell is proportional to the amount of electrons generated by the absorption of sunlight, in order to increase the efficiency, the amount of dye adsorbed on the titanium oxide nanoparticles is increased to increase the amount of electrons generated, , And the generated excited electrons must be prevented from disappearing by electron-hole recombination.

In order to increase the adsorption amount of dye per unit area, particles of oxide semiconductor should be manufactured to a nanometer level. In order to increase the absorption of sunlight, a method of raising the reflectance of the platinum electrode or mixing with a semiconductor oxide oxide light scatterer Have been developed.

However, such a conventional method has limitations in improving the photoelectric conversion efficiency of a solar cell, and accordingly, there is a urgent need to develop new technology for improving efficiency.

Accordingly, the present invention provides a dye-sensitized solar cell having excellent photoelectric conversion efficiency and a method of manufacturing the same.

A dye-sensitized solar cell according to an embodiment of the present invention includes a first substrate including a first electrode, a light absorbing layer located on the first substrate, and a second electrode located on the light absorbing layer, The light absorbing layer may include a plurality of semiconductor fine particles including a dye, a scattering layer located on the plurality of semiconductor fine particles, and a plurality of catalyst particles located on the scattering layer.

The catalyst particles may be at least one selected from the group consisting of Pt, Au, Ru, Pd, Rh, Ir, Os, C, TiO ₂ , A conductive polymer, and a conductive polymer.

The diameter of the catalyst particles may be 5 to 10 nm.

The plurality of catalyst particles may be dispersed and contacted on the scattering layer.

The light absorbing layer may further include an electrolyte.

The scattering layer may include a plurality of conductive particles.

The conductive particles may be at least one selected from the group consisting of Ti, Sn, Zn, W, Zr, Ga, In, Yr, Nb, (Ta), and vanadium (V).

According to another aspect of the present invention, there is provided a method of fabricating a dye-sensitized solar cell, comprising: forming a first electrode on a first substrate; forming a plurality of semiconductor microparticles including a dye on the first electrode; Forming a scattering layer on a plurality of semiconductor fine particles and forming a plurality of catalyst particles on the scattering layer to form a light absorbing layer; forming a second electrode on the second substrate; And the second substrate, and injecting an electrolyte into the light absorbing layer.

The plurality of catalyst particles may be formed by a method such as a screen printing method, a spray coating method, a doctor blade method, a gravure coating method, a dip coating method, a silk screen method, a painting method, a slit die coating method, a spin coating method, And the like.

INDUSTRIAL APPLICABILITY The dye-sensitized solar cell of the present invention and its manufacturing method are advantageous in that the photoelectric conversion efficiency of a solar cell can be improved by improving the transfer efficiency of electrons by forming a light absorption layer including a scattering layer and catalyst particles.

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

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

Referring to FIG. 1, a dye-sensitized solar cell 100 according to an embodiment of the present invention includes a first substrate 110 including a first electrode 120, a first substrate 110 including a first substrate 110, A light absorbing layer 130 and a second substrate 150 disposed on the light absorbing layer 130 and including a second electrode 140. The light absorbing layer 130 may include a plurality of A scattering layer 133 positioned on the plurality of semiconductor fine particles 131 and a plurality of catalyst particles 134 positioned on the scattering layer 133. The catalyst particles 134 may be formed on the semiconductor fine particles 131,

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. More specifically, the first electrode 120 is located on the first substrate 110, The second electrode 140 may be opposed to the second substrate 150 facing the first electrode 120.

A light absorbing layer 130 including a semiconductor particle 131, a dye 132 adsorbed to the semiconductor fine particles 131, and an electrolyte 135 is disposed 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 it is transparent so that external light can be incident thereon.

Here, concrete examples of the plastic include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polypropylene (PP), polyimide (PI), traaacetylcellulose (TAC) Lt; / RTI >

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

Here, the conductive metal oxide is 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 a mixture thereof, and preferably F: SnO ₂ can be used.

The light absorption layer 130 may include semiconductor fine particles 131, a dye 132 adsorbed on the semiconductor fine particles 131, and an electrolyte 135.

As the semiconductor fine particles 131, a compound semiconductor or a compound having a perovskite structure may be used in addition to a single semiconductor typified by silicon.

The semiconductor may be an n-type semiconductor that provides conduction band electrons as a carrier under photoexcitation to provide an anode current. The compound semiconductor may include at least one of titanium (Ti), tin (Sn), zinc (Zn), tungsten A metal oxide selected from the group consisting of Zr, Ga, In, Yr, Nb, Ta, and V can be used. Preferably, titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), zinc oxide (ZnO), niobium oxide (Nb ₂ O ₅ ), titanium oxide strontium (TiSrO ₃ ) Anatase type titanium oxide (TiO ₂ ) can be used. The kind of the semiconductor is not limited to these, and they may be used singly or in combination of two or more.

The particle diameter of the semiconductor fine particles 131 may be from 1 to 500 nm, and preferably from 1 to 100 nm. Further, the semiconductor fine particles 131 may be mixed with a large particle diameter or a small particle diameter, or may be used in multiple layers.

The semiconductor fine particles 131 can be formed by forming the semiconductor fine particles 131 as a thin film directly on the substrate by spraying spray or by using the substrate as an electrode to deposit the semiconductor fine particle thin film electrically, A paste containing fine particles which can be obtained by decomposition is applied on a substrate, and then dried, hardened or fired.

A dye 132 that absorbs external light and generates excited electrons may be adsorbed on the surface of the semiconductor fine particles 131.

The dye 132 may be formed of a metal complex including aluminum (Al), platinum (Pt), palladium (Pd), europium (Eu), lead (Pb), iridium (Ir), ruthenium . In particular, since ruthenium (Ru) can form many organic metal complexes as a wax belonging to the platinum group, it is preferable to use a dye 132 containing ruthenium (Ru).

An example of the dye 132 containing ruthenium (Ru) is Ru (etc bpy) ₂ (NCS) ₂ CH ₃ CN type. Here, etc are (COOEt) ₂ or (COOH) ₂ , and are reactors capable of bonding to the surface of the porous membrane.

On the other hand, a dye containing an organic dye may be used. The organic coloring matters may be coumarin, porphyrin, xanthene, riboflavin, triphenylmethan, etc., and may be used alone or in combination with other complexes.

The electrolyte 135 may be a redox electrolyte. Specifically, the electrolyte 135 may be a halogen redox electrolyte composed of a halogen compound having a halogen ion as a counter ion and a halogen molecule, a ferrocyanide-ferrocyanide or a ferrocene- An organic redox electrolyte such as an alkyl thiol-alkyl disulfide, a viologen dye, and a hydroquinone-quinone, and the like can be used, and a halogen redox system Electrolyte is preferred.

The halogen molecule in the halogen redox electrolyte composed of a halogen compound-halogen molecule is preferably an iodine molecule. 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 formed in the form of a solution containing it, a solvent chemically inert to the redox electrolyte may be used. Specific examples thereof include acetonitrile, propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, methoxyacetonitrile, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, butylolactone, dimethoxyethane, dimethyl carbonate, Dioxolane, methyl formate, 2-methyltetrahydrofuran, 3-methoxy-oxazolidin-2-one, sulfolane, tetrahydrofuran and water. Particularly, acetonitrile , Propylene carbonate, ethylene carbonate, 3-methoxypropionitrile, ethylene glycol, 3-methoxy-oxazolidin-2-one, and butylolactone. These solvents may be used singly or in combination.

The light absorption layer 130 may include a scattering layer 133.

The scattering layer 133 can act as a travel path that allows electrons to move more easily than through the electrolyte.

For this, the scattering layer 133 may be positioned adjacent to the second electrode 140, and may include a plurality of conductive particles.

Here, the conductive particles may be at least one selected from the group consisting of Ti, Sn, Zn, W, Zr, Ga, In, Yr, Tantalum (Ta), and vanadium (V). The conductive particles may have a particle diameter of 100 to 1000 nm.

The light absorbing layer 130 may include a plurality of catalyst particles 134 positioned on the scattering layer 133.

The plurality of catalyst particles 134 serve as a movement path that allows electrons to move more easily than through the electrolyte.

The catalyst particles 134 may be made of a material that facilitates transfer of electrons and may be formed of a material such as platinum (Pt), gold (Au), ruthenium (Ru), palladium (Pd), rhodium (Rh) , Osmium (Os), carbon (C), titanium oxide (TiO ₂ ), and a conductive polymer may be used. The catalyst particles 134 may be made of the same material as the catalyst electrode 142 of the second electrode 140.

Further, the catalyst particles 134 may have a particle diameter of 5 to 10 nm. If the particle size of the catalytic particle 134 is 5 nm or more, the particle size of the catalytic particle 134 is too small to be formed in the first electrode 120 or the semiconductor fine particle 131 through the gap of the scattering layer 133 And the particle diameter of the catalyst particles 134 is 10 nm or less so that the contact area where the catalyst particles 134 contact the scattering layer 133 can be increased to improve the electron transfer efficiency .

The plurality of catalyst particles 134 can be uniformly dispersed and contacted with the scattering layer 133. This can substantially increase the contact area of the catalyst particles 134 contacting the scattering layer 133, as described above. Accordingly, it is possible to improve the movement efficiency of electrons moving from the second electrode 140 to the scattering layer 133 through the electrolyte 135 and the catalyst particles 134.

The solar cell operates on the principle that electrons are excited while external light is absorbed by the dye, and excited electrons are injected into the first electrode through the semiconductor fine particles to generate a current. However, the photovoltaic conversion efficiency is lowered due to the difference in the electron mobility between the interfaces of the components in contact with the injection and migration of electrons in the solar cell, in particular, between the electrodes and the electrolyte.

Accordingly, the present invention provides a path of movement that allows the electrons to move more easily than the electron travels through the electrolyte, with the scattering layer 133 and the catalyst particles 134, There is an advantage that the transfer efficiency of the electrons regenerated to the semiconductor microparticles can be improved. Therefore, there is an advantage that the photoelectric conversion efficiency of the dye-sensitized solar cell can be improved.

Meanwhile, the second substrate 150 including 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, fluorotin oxide, antimony tin oxide, zinc oxide, tin oxide, ZnO- (Ga ₂ O ₃ or Al ₂ O ₃ )

The catalytic electrode 142 serves to activate the redox couple. The catalytic electrode 142 may be formed of platinum Pt, gold Au, ruthenium Ru, palladium Pd, rhodium Rh, iridium Ir ), Osmium (Os), carbon (C), titanium oxide (TiO ₂ ), and conductive polymer may be used.

Also, in order to improve the catalytic effect of redox, it is preferable that the catalytic electrode 142 facing the first electrode 120 has a fine structure to increase the surface area. For example, in the case of lead or gold, it is preferable that it is in a black state, and in the case of carbon, it is in a porous state. Particularly, the platinum black state can be formed by the anodic oxidation of platinum, the treatment with chloroplatinic acid, or the like, and the porous carbon can be formed by sintering carbon microparticles or calcining an organic molimer.

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, and triacetylcellulose.

When sunlight enters into the dye-sensitized solar cell 100 having such a structure, the photons are first absorbed by the dye 132 in the light absorption layer 130, and thus the dye 132 is converted into an excitation state And the electrons in the excited state are injected into the conduction band at the interface of the semiconductor fine particles 131. The injected electrons are transmitted to the first electrode 120 through the interface, To the second electrode 140, which is an opposite electrode.

On the other hand, the dye 132 oxidized as a result of the electron transfer is reduced by the ions of the oxidation-reduction couple in the electrolyte 135, and the oxidized ions are transported to the second electrode 140, The dye-sensitized solar cell 100 operates by performing a reduction reaction with electrons that have reached through the electrolyte 135, the catalyst particles 134, and the scattering layer 133.

Hereinafter, a method of manufacturing a dye-sensitized solar cell according to an embodiment of the present invention will be described.

2A to 2E are cross-sectional views illustrating a method of fabricating a dye-sensitized solar cell according to an embodiment of the present invention.

Referring to FIG. 2A, a first electrode 220 is formed on a first substrate 210. As described above, the first substrate 210 may be made of glass or plastic, and the first electrode 220 may use the above-described materials. For example, a conductive layer containing a conductive material may be formed on a transparent glass substrate using a physical vapor deposition (PVD) method such as electrolytic plating, sputtering, or electron beam evaporation, and doping with a fluorine (F) element .

Next, a plurality of semiconductor fine particles 231 are formed on the first electrode 220.

More specifically, the first electrode 220 may be formed by applying a semiconductor particulate paste in which a semiconductor fine particle 231, a binder, and a pore-forming polymer are dispersed in a solvent.

Here, the semiconductor fine particles 231 may be made of the same material as described above, and the binder may be selected from the group consisting of polyvinylidene fluoride, polyhexafluoropropylene-polyvinylidene fluoride copolymer, polyvinyl acetate, alkylated polyethylene oxide, Polyvinyl ether, polyalkyl methacrylate, polytetrafluoroethylene, polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, styrene-butadiene rubber, copolymers thereof, and mixtures thereof.

The pore-forming polymer may be a polymer in which no organic matter remains after the heat treatment. For example, polyethylene glycol, polyethylene oxide, polyvinyl alcohol, polyvinylpyrrolidone and the like may be used.

Examples of the solvent include alcohols such as ethanol, isopropyl alcohol, n-propyl alcohol and butyl alcohol, water, dimethylacetamide, dimethylsulfoxide, N-methylpyrrolidone and the like.

Examples of the method for applying the semiconductor particulate paste include screen printing, spray coating, doctor blade coating, gravure coating, dip coating, silk screening, painting, slit die coating, Transfer coating method or the like can be used.

After the semiconductor particulate paste is applied, heat treatment is performed. The heat treatment may be performed at 400 to 600 ° C for 30 minutes when the binder is added to the paste and at 200 ° C or less when the binder is not added.

Thereafter, a scattering layer 232 is formed on the plurality of semiconductor fine particles 231 formed by heat treatment.

More specifically, a paste is formed by mixing and dispersing a plurality of conductive particles made of a metal oxide, a binder, a polymer for forming pores, and a solvent. Here, the conductive particles may be at least one selected from the group consisting of Ti, Sn, Zn, W, Zr, Ga, In, Yr, Tantalum (Ta), and vanadium (V). The binder, the pore-forming polymer, and the solvent may be the same materials as the semiconductor particulate pastes described above.

The paste thus prepared may be applied by a screen printing method, a spray coating method, a doctor blade method, a gravure coating method, a dip coating method, a silk screen method, a painting method, a slit die coating method, a spin coating method, The scattering layer 232 is formed by coating using any one selected from the group consisting of silicon nitride and silicon nitride.

After the scattering layer 232 is formed, a heat treatment is performed. The heat treatment may be performed at 400 to 600 ° C for 30 minutes when the binder is added and at 200 ° C or less when no binder is added.

Next, referring to FIG. 2B, a plurality of catalyst particles 233 are formed on the scattering layer 232.

More specifically, a paste is formed by mixing and dispersing in a plurality of catalyst particles 233, a binder, a polymer for forming pores, and a solvent. Here, the catalyst particles 233 are made of at least one selected from the group consisting of Pt, Au, Ru, Pd, Rh, Ir, Os, (TiO ₂ ), and a conductive polymer. The binder, the pore-forming polymer, and the solvent may be the same as the above-mentioned semiconductor particulate paste.

The paste thus prepared may be applied by a screen printing method, a spray coating method, a doctor blade method, a gravure coating method, a dip coating method, a silk screen method, a painting method, a slit die coating method, a spin coating method, And a catalyst particle layer is formed by coating using any one selected from the group consisting of

After the catalyst particle layer is formed, heat treatment is performed to form a plurality of catalyst particles 233. The heat treatment may be performed at 400 to 600 ° C for 30 minutes when the binder is added and at 200 ° C or less when no binder is added.

Referring to FIG. 2C, the dye 234 is adsorbed on the semiconductor fine particles 231 formed in the previous process. That is, the dispersion containing the dye 234 is immersed in the spraying, coating or immersion liquid onto the first substrate 210 formed up to the catalyst particles 233 to adsorb the dye 234 to the semiconductor fine particles 231.

The dye 234 may be adsorbed after about 12 hours after the first substrate 210 on which the semiconductor fine particles 231 are formed is immersed in the dispersion containing the dye 234 and the adsorption time may be reduced by applying heat have. Here, the above-mentioned materials can be used as the dyes, and as the solvent for dispersing the dyes, acetonitrile, dichloromethane, alcohol-based solvents and the like can be used. Since the particle diameter of the dye 234 is very small, it can escape into the gap between the scattering layers 232 and be adsorbed to the semiconductor fine particles 231.

After the dye adsorption process, the dye adsorption process may be terminated by washing with a method such as solvent washing.

Referring to FIG. 2D, a second substrate 250 including a second electrode 240 is formed.

More specifically, a conductive layer containing a conductive material is formed on a transparent second substrate 250 made of glass or plastic using a physical vapor deposition (PVD) method such as electrolytic plating, sputtering, or electron beam evaporation, and a fluorine F) is doped to form the transparent electrode 241. [

Next, a catalyst precursor solution dissolved in a solvent such as alcohol is coated on the transparent electrode 241, and the catalyst electrode 242 is formed by performing a high-temperature heat treatment at 400 ° C or higher in an air or oxygen atmosphere.

Next, referring to FIG. 2E, the first substrate 210 and the second substrate 250 formed as above are bonded. More specifically, it can be formed by face-to-face bonding using an adhesive such as a thermoplastic polymer film, an epoxy resin, or an ultraviolet hardening agent.

A fine hole passing through the second substrate 250 is formed and the electrolyte 235 is injected into the space between the two electrodes through the hole to form the semiconductor fine particles 231, the scattering layer 232, the catalyst particles 233 ) And the dye 234 are completed. At this time, the electrolyte 235 can use the above-mentioned materials.

Finally, after the electrolyte 235 is injected, the hole formed in the second substrate 250 is sealed with an adhesive to complete the dye-sensitized solar cell 200 according to an embodiment of the present invention.

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: Preparation of dye-sensitized solar cell

(1) Working Electrode Fabrication

FTO glass (Pilkington, TEC7) was cut into 1.5 cm × 1.5 cm size. After washing for 10 minutes with ultrasonic cleaning detergent, the soapy water was completely removed using distilled water. Thereafter, ultrasonic cleansing with ethanol was repeated twice for 15 minutes. It was then rinsed thoroughly with absolute ethanol and then dried in an oven at 100 ° C. The prepared FTO glass was immersed in a 40 mM titanium (IV) chloride solution at 70 ° C for 40 minutes to improve contact with TiO ₂ , washed with distilled water, and completely dried in an oven at 100 ° C. Then, a titania (TiO ₂ ) paste (18-NR) manufactured by CCIC was coated on a FTO glass with a screen printer using a 9 mm × 9 mm mask (200 mesh). The coated film was dried in an oven at 100 DEG C for 20 minutes and then this process was repeated three times. The obtained titania (TiO ₂ ) paste (400C) of CCIC was coated once on a TiO ₂ film using a screen printer and dried in an oven at 100 ° C for 20 minutes. Thereafter, the film was baked at 450 占 폚 for 60 minutes to obtain a scattering layer of TiO ₂ film having a thickness of about 13 占 퐉. Then, hydrogen carbonate hexachloro-platinum (H ₂ PtCl ₆₎ 2- propanol _{(hydrogen hexachloroplatinate (H 2 PtCl 6} ) 2-propanol) solution to the coated TiO _2's after the scattering layer fired at 450 ℃ 60 bungan particles . The dye can be adsorbed by immersing the calcined TiO ₂ film in an anhydrous ethanol solution of a dye (N719) at a concentration of 0.5 mM for 24 hours. After the adsorption was completed, the dye which was not adsorbed with anhydrous ethanol was thoroughly washed and then dried using a heat gun.

(2) Production of counter electrode

A 1.5 cm x 1.5 cm sized FTO glass was drilled with two ø0.7 mm diamond drills (Dremel multipro395) to penetrate the electrolyte. After that, it was washed and dried in the same manner as the cleaning method suggested in the working electrode. Then hydrogen carbonate hexachloro platinum (H ₂ PtCl ₆₎ 2- propanol, then coated with _{(hydrogen hexachloroplatinate (H 2 PtCl 6} ) 2-propanol) solution of the FTO glass was baked at 450 ℃ 60 minutes.

(3) Manufacture of sandwich cell

A Surlyn (SX1170-25 Hot Melt) cut in a rectangular band between the working electrode and the counter electrode was placed, and the two electrodes were stuck to each other using a clip and an oven, and then the electrolyte was injected through two small holes in the counter electrode Then, a sandwich cell was fabricated by sealing with a shrinking lip and a cover glass. At this time, 0.1 M Lil, 0.05 M ₁₂ , 0.6 M 1-hexyl-2,3-dimethylimidazolium iodide and 0.5 M 4-tertiary-butylpyridine were added to the electrolyte solution, Nitrile solvent.

(4) Photocurrent-voltage measurement

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

Comparative Example

Except for the step of forming a scattering layer and a catalyst particle, which are TiO ₂ films, by screen-finishing a titania (TiO ₂ ) paste (400 C) of a CCIC company performed in a working electrode in the above embodiment, Thereby preparing the dye-sensitized solar cell of Fig. (The same components as those in Fig. 1 are denoted by the same reference numerals and the description thereof is omitted).

The short-circuit photocurrent density (J _sc ), the open circuit voltage (V _oc ), the fill factor, and the photoelectric conversion efficiency (PCE) of the dye-sensitized solar cell manufactured according to the above- ) Were measured and are shown in the following Table 1 and Fig. At this time, the experimental examples and the comparative examples were measured twice under the same conditions.

# Area (㎠) J _sc (mA) V _oc (V) FF (%) PCE (%) Example
One 0.25 13.0015 0.7250 0.6377 6.0113 2 0.25 13.0736 0.7474 0.6172 6.0307 Comparative Example
One 0.25 11.57382 0.7018 0.6743 5.4782 2 0.25 11.53216 0.7018 0.6740 5.4559

As shown in Table 1 and FIG. 4, it can be seen that the dye-sensitized solar cell manufactured according to the embodiment of the present invention exhibits a photoelectric conversion efficiency (PCE) superior to that of the comparative example.

Accordingly, the dye-sensitized solar cell according to an embodiment of the present invention has an advantage of excellent photoelectric conversion efficiency (PCE) by forming a light absorption layer including a scattering layer and catalyst particles.

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. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. 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 illustrates a dye-sensitized solar cell according to an embodiment of the present invention.

FIGS. 2A to 2E are views showing a process for producing a dye-sensitized solar cell according to an embodiment of the present invention. FIG.

3 illustrates a dye-sensitized solar cell fabricated according to a comparative example of the present invention.

4 is a graph showing a current-voltage curve of a dye-sensitized solar cell fabricated according to Examples and Comparative Examples of the present invention.

Claims (9)

A plasma display panel comprising: a first substrate comprising a first electrode; A light absorbing layer disposed on the first substrate; And And a second substrate disposed on the light absorbing layer and including a second electrode including a catalyst electrode, The light- A plurality of semiconductor microparticles including a dye; A scattering layer disposed on the plurality of semiconductor fine particles; And A plurality of catalytic particles spaced apart from the second electrode and dispersed and in contact with the scattering layer, Wherein the catalyst particles have a particle diameter of 5 to 10 nm. The method according to claim 1, The catalyst particles may be at least one selected from the group consisting of Pt, Au, Ru, Pd, Rh, Ir, Os, C, TiO ₂ , A conductive polymer, and a conductive polymer. delete delete The method according to claim 1, Wherein the light absorbing layer further comprises an electrolyte. The method according to claim 1, Wherein the scattering layer comprises a plurality of conductive particles. The method according to claim 6, The conductive particles may be at least one selected from the group consisting of Ti, Sn, Zn, W, Zr, Ga, In, Yr, Nb, (Ta), and vanadium (V). Forming a first electrode on a first substrate; Forming a plurality of semiconductor fine particles on the first electrode, forming a scattering layer on the plurality of semiconductor fine particles, forming a plurality of catalyst particles dispersed and in contact with the scattering layer, Absorbing dye to form a light absorbing layer; Forming a second electrode including a catalyst electrode on a second substrate; And Attaching the first substrate and the second substrate together, and injecting an electrolyte into the light absorbing layer, Wherein the plurality of catalyst particles are spaced apart from the second electrode and have a particle diameter of 5 to 10 nm. 9. The method of claim 8, The plurality of catalyst particles may be formed by a method such as a screen printing method, a spray coating method, a doctor blade method, a gravure coating method, a dip coating method, a silk screen method, a painting method, a slit die coating method, a spin coating method, Wherein the dye-sensitized solar cell is formed by one of the following methods.

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