KR101985709B1 - Dye-Sensitized Solar Cell Photoelectrodes formed nanochannels in TiO2 particles and preparation method thereof - Google Patents

Abstract

The invention TiO ₂ by relates to solar cells the photoelectrode and a method of manufacturing the nano channel is formed in the photo-electrode particles, and specifically, using a ultrasonic spray pyrolysis to form a nano channel in the TiO ₂ photo-electrode particles, and photo-electrode TiO ₂ The present invention relates to a method for greatly enhancing the efficiency of a dye-sensitized solar cell by increasing the contact interface between the dye / electrolyte and the electron / hole transfer resistance.

Description

TECHNICAL FIELD [0001] The present invention relates to a dye-sensitized solar cell, and a method of manufacturing the same. More particularly, the present invention relates to a photo-

The present invention is a dye-sensitized solar cells the photoelectrode, a preparation method thereof, and relates to a dye-sensitized solar cell using the photo-electrode, using the more specifically to ultrasonic spray pyrolysis which form a nano channel in the TiO ₂ particles, And a method of increasing the light conversion efficiency of the dye-sensitized solar cell by enlarging a contact area between the photoelectrode and TiO ₂ / dye / electrolyte through modification of the structure of the photo-electrode particle.

In an effort to convert light energy into electricity through solar cells, among the various types of solar cells developed so far, silicon-based solar cells reached 25% efficiency, but due to the use of large-sized high-priced equipment and high raw material prices, High. To overcome these shortcomings, Michael Gratzel of the University of Technology in Lausanne, Switzerland, in 1991, has developed a dye-sensitized solar cell, which has the advantages of low manufacturing cost, ease of manufacture, environment- (Gratzel, Nature, 335 , 1991, 737 ; Gratzel, J. Photochem. Photobio.A . 164, 2004, 3 ) has been the subject of much research since the publication of the Dye sensitized solar cell (DSSC) .

The dye-sensitized solar cell is composed of a dye-containing photoelectrode, a counter electrode, and an electrolyte. The dye, which receives light energy from the sun, emits electrons. The electron moves to the photoelectrode, moves to the counter electrode, Dyes that lose electrons have a structure to replenish electrons from the electrolyte. In a dye-sensitized solar cell having such a structure, the relationship between the photoelectrode, the dye, and the electrolyte is very important. The photoelectrode mainly uses oxides of nanocrystals (15-20 nm in diameter) capable of adsorbing dyes. The changes in the electronic structure and surface properties of nanoparticle oxides can affect both photocurrent and voltage. The reason for using nanoscale materials is that they can adsorb larger amounts of dye molecules by increasing the specific surface area due to particle size reduction. Nano-electrode material of the optical nano-scale in a way that increases the surface area of the particles by changing the form of nanowires in the (nano particle) (Nano wire) (Law, nature materials 2005 VOL 4 JUNE 455- 459) and the nanotube (nano tube) (Sadek, Langmuir 2009, 25, 509-514, Gratzel, ACS Nano ., Vol 2, No. 6, 1113-1116, 2008 , and Grimes, Adv . Funct . nano rod) (Sung, Adv . Mater. 2008, 20, 54-58 ). These studies have attempted to increase the amount of dye impregnation by increasing the surface area, but did not consider the relationship with the electrolyte. After the dye is separated into electrons and holes, electrons and holes are transferred. When the dye is reduced from the electrolyte again, it can be separated into electrons and holes to produce electricity. If the contact area between the electrolyte and the dye becomes small, do. When the photoelectrode particles of several nanometers are used to increase the adsorption amount of the dye, the amount of dye adsorption increases, but it is difficult to penetrate the inside of the photoelectrode along the space formed between the nanoparticles of the liquid electrolyte. But also has a drawback that the reduction reaction is not performed well. Therefore, it can affect both photocurrent and photovoltage depending on particle size, morphology, crystallinity, and surface state.

In order to solve this problem, the inventors of the present invention developed a dye-sensitized solar cell by forming a nano-channel on the photoelectrode particles and penetrating the dye or electrolyte well into the photoelectrode to increase the contact area between the photoelectrode TiO ₂ / dye / between eager to improve the light conversion efficiency, and the photoelectrode TiO ₂ / dye / the contact area between the electrolyte to increase use of the ultrasonic spray pyrolysis method to produce a TiO ₂ particles to form a nano channel by photoelectrode TiO ₂ / dye / electrolyte And the contact area is increased. As a result of fabricating the dye-sensitized solar cell using TiO ₂ particles having the nanochannel thus formed as a photoelectrode, the cell performance can be improved, thereby completing the present invention.

It is therefore an object of the present invention provides a titanium dioxide (TiO ₂₎ having a structure in which nano-channels are formed in the particles, a dye-sensitized solar cells the photoelectrode, and a dye-sensitized solar cell comprising the same.

Another object of the present invention is to provide a method of manufacturing a dye-sensitized solar cell photoelectrode in which nano channels are formed in titanium dioxide (TiO ₂ ) particles using ultrasonic spray pyrolysis, and a dye- To provide a method of manufacturing a solar cell.

It is another object of the present invention to provide a dye-sensitized solar cell in which the efficiency of a dye-sensitized solar cell is improved by enlarging a contact interface between a photoelectrode TiO ₂ / dye / electrolyte by forming a nanochannel in a TiO ₂ photoelectrode particle by ultrasonic spray pyrolysis And to provide a method for increasing the amount.

In order to achieve the above object, the present invention provides a dye-sensitized solar cell photoelectrode having a structure in which nano channels are formed in titanium dioxide (TiO ₂ ) particles.

The present invention also provides a dye-sensitized solar cell comprising the photo-electrode of the dye-sensitized solar cell according to the present invention.

The present invention also relates to a dye-sensitized photovoltaic cell, which comprises a step of forming a plurality of nanocrystals in a TiO ₂ particle through ultrasonic spray pyrolysis of titanium dioxide (TiO ₂ ) nanoparticles, mesoporous TiO ₂ particles.

The present invention also provides a mesoporous TiO ₂ particle for a photo-electrode for a dye-sensitized solar cell, which is produced by the production method according to the present invention.

The present invention also provides a dye-sensitized solar cell photo electrode comprising the mesoporous TiO ₂ particles according to the present invention.

In addition,

1) preparing a TiO ₂ paste using mesoporous TiO ₂ particles having nano channels formed in the particles according to the present invention;

2) coating the TiO ₂ paste of step 1) to form a film; And

3) heat-treating the sintered film of step 2) and sintering the sintered film of the dye-sensitized solar cell.

The present invention also provides a dye-sensitized solar cell comprising a dye-sensitized solar cell photoelectrode in which a plurality of nanocrystals are formed in the TiO ₂ particles according to the present invention.

In addition,

1) preparing the photoelectrode according to the present invention;

2) impregnating the dye solution with the photoelectrode;

3) forming a counter electrode facing the photoelectrode; And

4) injecting an electrolyte between the photoelectrode and the counter electrode, and sealing the photoelectrode.

The present invention relates to a dye sensitized photovoltaic cell by decreasing the transfer resistance of electrons / holes by enlarging the contact interface between the photoelectrode TiO ₂ / dye / electrolyte by forming nano channels in TiO ₂ photoelectrode particles using ultrasonic spray pyrolysis The efficiency can be greatly improved.

In the present invention, particle size can be easily controlled by controlling only the addition amount of a pore agent in a spraying solution, and it can be used as it is in the process of manufacturing a photoelectrode for a conventional DSSC. The effect is great.

1 is a schematic diagram of nanocrystalline TiO ₂ particle formation according to the present invention.
FIG. 2 is a view showing a structure formed by a conventional dye-sensitized solar cell (left) and TiO ₂ (oxide semiconductor) / dye / electrolyte of the dye-sensitized solar cell of the present invention (right).
FIG. 3 is a graph showing the results of observation of the surface of TiO ₂ particles according to the addition amount of the pore agent of the present invention by means of a field-emission scanning electron microscope (FE-SEM) and a transmission electron microscope (TEM).
FIG. 4 is a graph showing the results of analysis of pore volume of TiO ₂ particles by BET (Brunauer, Emmett, Telle) analysis according to the amount of added pore agent of the present invention.
FIG. 5 is a graph showing a current-voltage curve according to addition amounts (0, 0.5, and 1.5 wt%) of the pore-forming agent to the dye-sensitized solar cell of the present invention.
6 is a graph showing the Nyquist plot according to the addition amounts (0, 0.5, and 1.5 wt%) of the pore-forming agent to the dye-sensitized solar cell of the present invention.
FIG. 7 is a graph showing the results of analyzing the dye-impregnating amount of the photo-electrode with the UV-vis absorbance according to the impregnation amount of the pore-forming agent in the dye-sensitized solar cell of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention is titanium dioxide (TiO ₂₎ provides a having a structure in which nano-channels are formed, the dye-sensitized solar cell electrode in the light particles.

The present invention also provides a dye-sensitized solar cell comprising the photo-electrode of the dye-sensitized solar cell according to the present invention.

The number, size, and position of the pores in the nanocrystals may be uniform or non-uniform within the TiO ₂ particles.

The TiO ₂ may have a size of 10 to 30 nm for the nanochannel and a volume of 0.050 to 0.50 cm ³ / g, preferably 10 to 20 nm, and a volume of 0.060 to 0.20 cm ³ / g.

The dye may be uniformly dispersed around the TiO ₂ particles and the electrolyte may be positioned on the nanochannels and may be dispersed and contacted around the nano TiO ₂ particles and the dye.

The dye-sensitized solar cell according to the present invention can enhance the cell performance in the dye-sensitized solar cell by enlarging the contact interface between the photoelectrode TiO ₂ / dye / electrolyte by forming nano channels in the TiO ₂ photoelectrode particles .

The present invention also relates to a process for the production of mesoporous TiO ₂ particles for dye-sensitized solar cell photoelectrodes, comprising the step of forming nanocrystals in TiO ₂ particles through ultrasonic atomization pyrolysis of titanium dioxide (TiO ₂ ) particles. ≪ / RTI >

Specifically,

1) preparing a spray solution comprising a TiO ₂ precursor and a pore-forming agent;

2) spraying the spraying solution to generate droplets;

3) drying the generated droplet, and then decomposing the precursor and the porogen;

4) forming particles having pores; And

5) sintering for crystallinity of the particles.

The pore-forming agent is preferably added in an amount of 0.05 to 5.0 wt%, more preferably 0.1 to 1.5 wt%, based on the spray solution, but is not limited thereto.

The ultrasonic spray pyrolysis

1) preparing a spray solution containing a TiO ₂ precursor and a pore former; And

2) spraying the spray solution with a droplet generator; A drying section of the droplet; The reaction part of the droplet; And a collecting part for collecting the generated particles, into the ultrasonic spray pyrolysis system.

The spray pyrolysis system

A droplet generating unit including an ultrasonic spray droplet generating device to generate droplets;

A drying zone connected to the droplet generating unit, where the droplet is dried, decomposed and crystallized;

A reaction zone connected to the drying unit for sintering the droplets transported through the heat treatment; And

And a collecting part connected to the reaction part and collecting the carried particles through a filter.

The present invention also provides a method, TiO ₂ meso Poros (mesoporous) TiO ₂ particles for the dye-sensitized solar cells the photoelectrode nano channels formed in the particles prepared in accordance with the present invention.

The mesoporous TiO ₂ particles may have a pore size of 10 to 30 nm, a volume of 0.050 to 0.50 cm ³ / g, a pore size of 10 to 20 nm, and a volume of 0.060 to 0.20 cm ³ / g.

In addition,

1) preparing a TiO ₂ paste using mesoporous TiO ₂ particles according to the present invention;

2) coating the TiO ₂ paste of step 1) to form a film; And

3) heat-treating the sintered film of step 2) and sintering the sintered film of the dye-sensitized solar cell.

The TiO ₂ paste of the step 1) is prepared by adding α-terpineol, ethanol, ethyl cellulose, and porous micron-sized TiO ₂ to a vessel, (roll milling).

The coating of step 2) is preferably coated with a doctor blade, but not limited thereto, and screen printing, spraying, spin coating or painting can be used.

The heat treatment in step 3) is preferably performed at 400 ° C or higher for 30 minutes or more, more preferably at 400 to 800 ° C for 30 to 120 minutes, but is not limited thereto.

The present invention also provides a dye-sensitized solar cell comprising a photoelectrode in which nano channels are formed in the TiO ₂ particle according to the present invention.

In addition,

1) preparing a photo electrode in which nano channels are formed in the TiO ₂ particle according to the present invention;

2) impregnating the dye solution with the photoelectrode;

3) forming a counter electrode facing the photoelectrode; And

4) injecting an electrolyte between the photoelectrode and the counter electrode, and sealing the electrolyte;

The present invention also provides a method of manufacturing a dye-sensitized solar cell.

Hereinafter, the present invention will be described in detail with reference to Examples and Experimental Examples. However, the following Examples and Experimental Examples are merely illustrative of the present invention, and the present invention is not limited to the following Examples and Experimental Examples.

< Example  1> TiO ₂  Manufacturing of particles

The TiO ₂ particles were prepared and used in the following manner.

Titanium (IV) isopropoxide (TTIP) was used as a starting material. 1 solution was added to 70 ml of 2-propanol solution at a molar ratio of TTIP and acetylacetone of 1: 3. The second solution is a triblock copolymer in which 0.1 mol of HNO ₃ is a pore agent in a solution of 180 ml of DI water and 70 ml of 2-propanol. Tri block (EO) 20- (PO) 70- (EO) 20 (P-123) (0, 5, 15 g). The thus prepared solution 1 was slowly added to the solution 2 and stirred for 10 minutes or more. Meso-porous TiO2 particles were prepared by ultrasonic spray pyrolysis using the spray solution.

The ultrasonic spray pyrolysis apparatus is mainly divided into a droplet generating unit, a drying unit of the generated droplet, a reaction unit, and a collecting unit for collecting the generated particles. For the droplet generation, an ultrasonic droplet generator (H-TECH) equipped with six ultrasonic vibrators of 1.7 MHz was used. The droplets generated from the ultrasonic droplet generating device are transported to the drying section through nitrogen of 5 L / min. The temperature of the electric furnace was set at 150 ° C and 400 ° C to 600 ° C for the drying part and the reaction part, respectively. The resulting powders were collected using a Teflon filter. The post - heat treatment of the TiO ₂ powder was performed in a tubular electric furnace. TiO ₂ particles were obtained by maintaining the temperature at 400 ° C. for 3 hours in order to improve crystallinity.

FIG. 3 shows FE-SEM (HITACHI-SU8010) and TEM (JEOL-JEM-2100F) results of the particle surface and particle penetration depending on the amount of pore agent added to form the nanochannel. As a result of FE-SEM analysis, P 0 without pore-forming agent can be confirmed as a result of dense surface and TEM analysis. As a result of FE-SEM analysis, fine cracks were observed on the surface of P0.5 and P1.5 containing pore-forming agent, and as a result of TEM analysis, it was confirmed that many nanocrystals were present in the particles at P1.5 (Fig. 3) .

FIG. 4 shows the surface area, porosity and porosity of the TiO ₂ particles measured by BET analysis (Micromeritics - 3Flex) with respect to the addition amount of the pore agent (FIG. 4). As a result, the porosity of P0.5 and P1.5 with pore-forming agent at P0 without pore-forming agent was 11.1 nm at 7.6 nm and 0.060 cm / g at 0.17 cm / / g. The results of the analysis are summarized in Table 1 (Table 1).

BET analysis of TiO ₂ particles on the amount of pore-forming agent added Pore size (nm) Pore volume (cm ³ / g) PO 7.6 nm 0.008 cm ³ / g P 0.5 11.1 nm 0.060 cm &lt; ³ &gt; / g P 1.5 16.7 nm 0.164 cm &lt; ³ &gt; / g

< Example  2> Paste  Produce

TiO ₂ paste was prepared in the following order.

First, 1.5 g of? -Terpineol and 0.5 g of ethanol were added to a 20 ml glass vial and 0.1 g of each of two kinds of ethyl cellulose having different molecular weights were mixed. 0.5 g of the TiO ₂ nanoparticles formed by varying the amount of the pore agent was added to the solution containing the binder and stirred at 2000 rpm for 30 minutes in a centrifugal mixer. Ethanol was evaporated and three-roll milled for 15 minutes to disperse and crush the paste particles.

< Example  3> Dye-sensitized solar cell DSSC )

 In order to measure the photoelectrode cell efficiency of the nano channel structure, DSSC cells were fabricated in the following order.

To fabricate the photoelectrode, FTO glass (2 cm x 1.2 cm) was washed with acetone and ethanol for 20 minutes each using a sonication and then dried with nitrogen. To smooth the contact between the FTO glass and the TiO ₂ film, a 0.04 M TiCl ₄ solution was dropped onto the FTO glass, dried in an oven at 70 ° C. for 20 minutes, washed with distilled water and ethanol, and dried with nitrogen. The TiO ₂ paste was cast on a FTO glass with a doctor blade method to a thickness of 0.7 cm x 0.5 cm to a thickness of about 35 μm. Lt; RTI ID = 0.0 &gt; 550 C &lt; / RTI &gt; for 30 minutes. When the temperature dropped to 80 ° C, the photoelectrode was taken out of the electric furnace, and the photoelectrode was immersed in the N719 dye ethanol solution and impregnated with light for 18 hours. The impregnated photoelectrode was washed twice with ethanol and then dried in a desiccator under a nitrogen atmosphere.

To prepare the counter electrode, two holes were drilled in the FTO glass for injecting the electrolyte. The perforated FTO glass was washed with acetone and ethanol for 20 minutes each using sonication and then dried with nitrogen. The Pt paste was cast onto a FTO glass with a doctor blade method to a size of 1.4 cm x 0.8 cm. Lt; RTI ID = 0.0 &gt; 400 C &lt; / RTI &gt; for 20 minutes.

The prepared photoelectrode and the counter electrode were bonded to each other by pressurization for about 5 to 10 seconds on a heating plate heated at 180 DEG C with a surlyn having a thickness of 60 mu m. The bonded electrodes were placed in a vacuum oven and decompressed for about 5 minutes. Electrolytes were injected into the holes of the bonded electrodes, and cells were prepared by using a surlyn and a cover glass to cover the holes with the pharynx. The light efficiency was measured after aging for one day.

< Experimental Example  1> Porogen (pore agent) added

Cell performance was measured to confirm the effect of light conversion efficiency of the cell using TiO ₂ particles according to the amount of pore-forming agent added.

 A solar simulator (K101 LAB20) from McScience Inc. was used to measure the light conversion efficiency of the fabricated cell, and a xenon lamp (150 mW / cm2) was used as the light source. In order to measure the lifetime of the electrons generated in the cell and the resistance at the interface, it was analyzed in the frequency range of AC 0.02 V to 0.01 to 40000 Hz by an Auto LAB company electrochemical impedance spectroscopy (EST, PGSTAT30).

As a result of the experiment, FIG. 5 shows the current-voltage curve according to the amount of the pore-forming agent added (FIG. 5). In the case of the cell with no pore-forming agent (P 0), the short circuit current was 9.06 mA / cm ² whereas the cell with the pore-forming agent P 0. 5 and P 1. 5 was 11.80 and 19.54 mA / cm 2 ² as compared with the control. In terms of efficiency, it was 3.55% for the cell (P 0) without the pore-forming agent, and 5.42 and 7.76% for the cell with the pore-forming agent P0.5 and P1.5, respectively. The efficiency of the addition of the pore - forming agent was higher than that of the cells without pore - forming agent. The maximum efficiency was 7.76% when the amount of the pore-forming agent was 1.5, which was about 218% (more than twice that of the cell without the pore-forming agent).

FIG. 6 shows a Nyquist plot of the cell prepared according to the amount of the pore-forming agent added (FIG. 6). In general, three semicircles appear on the Nyquist plot of the DSSC. The first half (R ₁ ) represents the resistance between the counter electrode and the electrolyte, the second half (R ₂ ) represents the resistance between the photoelectrode and the electrolyte and dye (R ₃ ) is known to exhibit the diffusion resistance of redox iodide ions in the electrolyte ( Applied Physics Letters, 84, 2004, 13; Electrochimica Acta 47, 2002, 4213 ). 6, it can be seen that the R ₂ of the cell to which the pore-forming agent P1.5 is added is significantly reduced as compared with the cell to which the pore-forming agent is not added. This implies that the resistance between the photoelectrode and the electrolyte and the dye is greatly reduced indirectly. That is, nanoparticles are formed in the particles through the pore-forming agent, and electrolyte and dye penetrate into the TiO ₂ particles to increase the contact area between the TiO ₂ / dye / electrolyte of the photoelectrode, thereby reducing the resistance. Table 2 below shows the open-circuit voltage, short-circuit current, fill factor, efficiency, and resistance of the cell according to the amount of pore-forming agent added (Table 2).

< Experimental Example  2> Porogen In impregnation  Following Photoelectrode  Dyestuff Impregnated  Confirm

In fact, it was tried to confirm whether the amount of liquid impregnation increases in the cell made of nanochannel-formed particles prepared by adding a pore-forming agent.

The impregnation amount of the liquid was measured by immersing the photoelectrode in the N719 dye ethanol solution into the photoelectrode and then drying and desorbing the dye using 0.1M NaOH. NaOH solution was analyzed by UV-Vis absorbance to compare the amount of dye impregnated. If nanoparticles are well formed in the TiO2 particles by adding pore-forming agents, it is expected that the N719 dye ethanol solution will penetrate well into the TiO2 particles and increase the impregnation amount of the N719 dye. It can be seen that the 313 nm peak in the literature ( Chem. Eur . J. 10, 2004, 595 ) is a unique peak representing the N719 dye.

As shown in FIG. 7, a sharp peak was observed at a wavelength of 313 nm, and the absorbance of the cell having no pore-forming agent (P0) was 0.081 and the cell having the pore-forming agent P0.5 , And P1.5 were 0.121 and 0.149 peaks, respectively, which were larger than those of the cells not containing the pore-forming agent (Fig. 7). That is, it can be seen that the dye impregnated into the TiO ₂ particles forming the nano channel by adding the pore-forming agent is greatly increased. By adding the pore-forming agent to form the nano-channels in the TiO ₂ particles, the impregnation amount of the dye and the electrolyte can be increased, thereby maximizing the contact area between the photo-electrode TiO ₂ / dye / electrolyte. This allows the electron / hole transport reaction formed through the light to be transmitted from the interface at a high speed, thereby increasing the light conversion efficiency.

Claims (16)

Titanium dioxide (TiO ₂₎ having a structure in which nano-channels are formed on the surface and inside of particles, dye-sensitized solar cells the photoelectrode.
According to claim 1, wherein the nanochannel is dye-sensitized solar cells the photoelectrode, characterized in that the number, size and location of the pores on the TiO ₂ surface and the internal uniform or non-uniform.
The dye-sensitized solar cell photoelectrode according to claim 1, wherein the TiO ₂ has a pore size of 10 to 30 nm and a pore volume of 0.050 to 0.50 cm ³ / g.
The dye-sensitized solar cell photoelectrode according to claim 1, wherein the dye is uniformly dispersed around the TiO ₂ particles.
A dye-sensitized solar cell comprising the dye-sensitized solar cell photoelectrode according to any one of claims 1 to 4.
A process for producing mesoporous TiO ₂ particles for dye-sensitized solar cell photoelectrode, comprising the step of forming titanium dioxide (TiO ₂ ) particles on the surface and inside of the TiO ₂ through ultrasonic spray pyrolysis.
The method of claim 6, wherein the ultrasonic spray pyrolysis
1) preparing a spray solution containing a TiO ₂ precursor and a pore former; And
2) spraying the spray solution with a droplet generator; A drying section of the droplet; The reaction part of the droplet; And a collecting unit for collecting the generated particles. The method of manufacturing a mesoporous TiO ₂ particle for a photoelectrode in a dye-sensitized solar cell, comprising the steps of:
delete The method of claim of claim 7 wherein the pore forming agent is from 0.05 to 5.0, the dye-sensitized solar cells the photoelectrode meso Poros (mesoporous) TiO process for producing a ₂ particles, characterized in that the addition of wt% based on the total spray solution.
The method of claim 7, wherein the spray pyrolysis system
A droplet generating unit including an ultrasonic spray droplet generating device to generate droplets;
A drying zone connected to the droplet generating unit, where the droplet is dried, decomposed and crystallized;
A reaction zone connected to the drying unit for sintering the droplets transported through the heat treatment; And
And a collecting unit connected to the reaction unit and collecting the carried particles through a filter. The method of manufacturing a mesoporous TiO ₂ particle for a photo-electrode of a dye-sensitized solar cell,
A mesoporous TiO ₂ particle for a dye-sensitized solar cell photo-electrode produced by the method of claim 6.
12. The dye sensitized solar cell according to claim 11, wherein the mesoporous TiO ₂ particles for the dye-sensitized solar cell photoelectrode have a pore size of 10 to 30 nm and a pore volume of 0.050 to 0.50 cm ³ / g. Mesoporous TiO ₂ particles for battery photoelectrode.
A dye-sensitized solar cell photoelectrode comprising mesoporous TiO ₂ particles prepared by the method of claim 7.
1) preparing a TiO ₂ paste using mesoporous TiO ₂ particles prepared by the method of claim 7;
2) coating the TiO ₂ paste of step 1) to form a film; And
3) heat-treating and sintering the film of step 2).
A dye-sensitized solar cell comprising the dye-sensitized solar cell photo-electrode of claim 13.
1) preparing a dye-sensitized solar cell photo-electrode according to claim 1 or 13;
2) impregnating the dye-sensitized solar cell photoelectrode with a dye solution;
3) forming a counter electrode facing the dye-sensitized solar cell photoelectrode; And
4) injecting an electrolyte between the dye-sensitized solar cell photoelectrode and the counter electrode, and sealing the dye-sensitized solar cell.

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