JP2006236960A - Dye-sensitized solar cell and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dye-sensitized solar cell of a monolithic type capable of utilizing an electrolytic solution with high power generating efficiency expected and having a structure capable of forming a counter electrode on top of the solid electrolyte, and its manufacturing method. <P>SOLUTION: The dye-sensitized solar cell 1 comprises a substrate 2, an electrode substrate composed of a first conductive layer 4 formed on one face of this substrate 2, and a cell structure 10 composed of a porous semiconductor layer 6, a porous insulator layer 5, and a second conductive layer 9 laminated in order on the first conductive layer 4. The porous conductive layer 6 and the porous insulator layer 5 contain electrolytic solutions 15 inside. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dye-sensitized solar cell and a method for manufacturing the same, and more particularly to a monolithic type dye-sensitized solar cell having a configuration without a counter electrode substrate and a method for manufacturing the same.

  Dye-Sensitized Solar Cell (DSC) was developed by Gretzell et al. In Switzerland and has advantages such as high conversion efficiency and low manufacturing cost. (See, for example, Patent Document 1, Patent Document 2, and Non-Patent Document 1).

  As shown in FIG. 7 and FIG. 8, the schematic structure of the dye-sensitized solar cell is usually a transparent conductive film on an electrode substrate in which a transparent first base material 102 and a transparent conductive film 104 are provided on one surface thereof. A working electrode 108 made of oxide semiconductor fine particles (nanoparticles) such as titanium dioxide and having a porous film 106 on which a photosensitizing dye is supported, and a working electrode 108 are provided so as to be in contact with the working electrode 104. The working electrode 108 and the counter electrode 109 are filled with an electrolyte solution (or electrolyte gel) 105 containing a redox pair, and this constitutes one cell. . In this type of dye-sensitized solar cell, the oxide semiconductor fine particles constituting the porous film 106 are sensitized by a photosensitizing dye that absorbs incident light such as sunlight, and the gap between the working electrode 108 and the counter electrode 109 is increased. When an electromotive force is generated, the photoelectric conversion element functions to convert light energy into electric power.

In order to increase the voltage in such a solar cell, a “series connection type” in which a large number of small cell structures are arranged in series is effective, and the structure shown in FIG. 7 (hereinafter referred to as W type) and FIG. Two types of structures shown in FIG. 8 (hereinafter referred to as Z-type) are widely adopted.
As shown in FIG. 7, the W-type dye-sensitized solar cell 100 </ b> A includes a partition wall 103 that partitions cells between cells 101 (a, b, c...) To be joined, and a working electrode 108 and a counter electrode 109. Are arranged alternately, and a transparent conductive film 104 (106) having a common counter electrode 109 and working electrode 108 of cells (for example, 101a and 101b) located adjacent to each other is provided on the same base material 102, and is electrically connected. It consists of the structure connected to.

  On the other hand, as shown in FIG. 8, the Z-type dye-sensitized solar cell 100B is provided with a partition wall 103 that partitions cells between cells 101 (a, b, c. The one side and the counter electrode 109 are separately arranged so as to be on the other side, and the adjacent working electrode 108 and the counter electrode 109 of the cells (for example, 101a and 101b) located adjacent to each other are provided inside the partition wall 103. The conductive member 107 is electrically connected.

  However, when the electrolyte solution is sandwiched between the working electrode and the counter electrode, the vapor pressure of the organic solvent suitable as the solvent for the electrolyte is relatively high. Therefore, there is a risk that electrolyte solution leakage or solvent evaporation may occur due to deterioration of the sealant, and as a result, the reliability and long-term stability of the solar cell are impaired.

  Accordingly, attention has been paid to a dye-sensitized solar cell obtained by solidifying an electrolyte that can solve such problems and can be expected to have long-term stability. For example, as shown in FIG. 9, a transparent conductive film 114, a semiconductor layer 116, a solid electrolyte layer 115, and a counter electrode 119 made of a conductive layer are sequentially stacked on a base material 112 forming a working electrode (hereinafter referred to as a monolithic structure). (Referred to as Non-Patent Document 1).

  In this monolithic type, the W type and the Z type are manufactured by separately preparing the working electrode and the counter electrode, and bonding them together, and then injecting an electrolyte between them. Therefore, the cost can be reduced by that amount, and since it can be produced by sequentially layering each layer on the substrate (single plate) forming the working electrode, the production process is relatively simple, It also has the advantage of being suitable for mass production.

  However, in the case of the above-described monolithic type, the counter electrode cannot be formed on the electrolyte layer unless the electrolyte layer is solid, so a solid electrolyte is used. However, the solid electrolyte has higher resistance than the liquid electrolyte (electrolyte). Therefore, the power generation efficiency was inevitably low.

  In addition, even in a monolithic type using a solid electrolyte, it is necessary to prepare a counter electrode after a dye is supported on a semiconductor layer (for example, a titanium oxide porous layer) and the electrolyte is cured because of the process. It is required to produce the counter electrode by a method that the layer can withstand. Therefore, various conditions of the vacuum process and high temperature process used when forming the counter electrode are severely limited, so that the degree of freedom of material selection is small and the room for improving the characteristics is narrow.

That is, conventionally, a monolithic dye-sensitized solar cell using an electrolyte solution that is expected to improve power generation efficiency cannot be produced, and a monolithic dye-sensitized solar cell using a solid electrolyte is not available. Even in this case, the manufacturing process is complicated, and the manufacturing method is limited.
Journal of JSES, 1999 Vol.25, No.25, p.22-31 “Solidification of dye-sensitized electrochemical solar cells” (Yoshida Yanagida, Takayuki Kitamura, Yuji Wada)

  The present invention has been made in view of the above circumstances, and it is possible to use an electrolyte solution that is expected to have high power generation efficiency, and has a configuration in which a counter electrode can be easily produced on the same as a solid electrolyte. An object is to provide a monolithic dye-sensitized solar cell and a method for producing the same.

  The dye-sensitized solar cell according to claim 1 of the present invention is arranged in such a manner that a base material and an electrode substrate composed of a first conductive layer disposed on one surface of the base material are sequentially stacked on the first conductive layer. A cell structure comprising a porous semiconductor layer, a porous insulator layer, and a second conductive layer is provided, wherein the porous semiconductor layer and the porous insulator layer contain an electrolytic solution therein. To do.

  The dye-sensitized solar cell according to claim 2 of the present invention covers the first conductive layer, the porous semiconductor layer, the porous insulator, and the second conductive layer according to claim 1, and has an adjacent cell structure. A protective member arranged to partition the body is provided.

  A dye-sensitized solar cell according to a third aspect of the present invention is the dye-sensitized solar cell according to the first aspect, wherein a plurality of the cell structures are connected in series, and the number of stages according to the number of the cell structures is a current-voltage. It is characterized by being observed on a curved line.

  In the method for producing a dye-sensitized solar cell according to claim 4 of the present invention, an electrode substrate including a base material and a first conductive layer disposed on one surface of the base material, and the first conductive layer are sequentially stacked. A method for producing a dye-sensitized solar cell comprising a cell structure composed of a porous semiconductor layer, a porous insulator layer, and a second conductive layer, wherein the porous semiconductor layer is formed After providing a porous insulator constituting the porous insulator layer on the porous semiconductor and then forming the second conductive layer on the porous insulator, the porous semiconductor and the porous insulator It is characterized by comprising at least a step of containing an electrolytic solution therein.

  In the dye-sensitized solar cell according to the present invention, the porous semiconductor layer and the porous insulator layer contain the electrolytic solution therein, so that the electrolytic solution having high power generation efficiency in the pores existing between the particles of the porous body. It becomes a structure that has been soaked. Further, since the porous insulator layer is made of a solid, a second conductive layer functioning as a counter electrode can be easily formed thereon. According to this configuration, electrons moving from the second conductive layer forming the counter electrode toward the first conductive layer forming the working electrode travel in the electrolyte contained in the pores in the porous insulator layer, and the porous semiconductor Will lead to a layer.

  Therefore, according to the present invention, it is possible to use an electrolytic solution having superior conductive performance as compared with a conventional solid electrolyte, and therefore it is possible to provide a monolithic dye-sensitized solar cell with extremely high power generation efficiency. In addition, since the electrolyte solution soaked in the pores is poor in fluidity like the electrolyte in which the nonvolatile ionic liquid is gelled, the present invention is compared with the case where only the liquid electrolyte is used as it is. Thus, a dye-sensitized solar cell that is excellent in stability, durability, and handleability and does not impair the characteristics of the cell structure is provided.

  Further, the method for producing a dye-sensitized solar cell according to the present invention is provided by previously providing a porous insulator constituting the porous insulator layer on the porous semiconductor constituting the porous semiconductor layer, and then the porous insulation. After the second conductive layer functioning as a counter electrode is formed on the body, the method includes a step of including an electrolytic solution in the porous semiconductor and the porous insulator, that is, in the pores existing between the particles of each porous body. Therefore, the dye can be supported on the porous semiconductor layer, and the electrolytic solution can be contained in the porous semiconductor layer and the porous insulator layer.

  That is, according to the present invention, after the counter electrode is formed first, the porous insulator located in the lower layer and the procedure of introducing the dye or the electrolyte into the porous insulator can be taken. A known high-temperature process or vacuum process is employed, and a thin film made of a preferable material or composition as a counter electrode can be provided as appropriate. Then, a cell structure formed by laminating up to the second conductive layer as a counter electrode is first prepared, and after the temperature of the cell structure itself is set to a temperature range that does not affect the dye or electrolyte, the dye It is possible to impregnate these into the two porous bodies by immersing them in an electrolytic solution containing. Therefore, the material of the dye and the electrolytic solution and the production conditions thereof can be selected without being troubled by the counter electrode formation conditions, so that this production method contributes to further improvement of characteristics.

Hereinafter, an embodiment of a dye-sensitized solar cell according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a structural example of a dye-sensitized solar cell according to the present invention. FIG. 2 is a partially enlarged cross-sectional view of the dye-sensitized solar cell shown in FIG. 1, schematically illustrating the flow of electrons in the porous insulator layer.

  As shown in FIGS. 1 and 2, the dye-sensitized solar cell 1 according to the present invention includes an electrode substrate including a base material 2 and a first conductive layer 4 disposed on one surface of the base material 2. A cell structure 10 comprising a porous semiconductor layer 6, a porous insulator layer 5, and a second conductive layer 9 that are arranged on the first conductive layer 4 in order, and the porous semiconductor layer; 7 and the porous insulator layer 6 are configured to include an electrolytic solution 15 therein.

The base material 2 is not particularly limited as long as it is a transparent member having electrical conductivity that conducts electricity by forming a film (layer) made of a conductive material on one surface and having high light transmittance. As this base material 2, it is common to use a glass plate, but besides the glass plate, for example, a plastic sheet such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), A ceramic polishing plate such as titanium oxide or alumina can be used. Here, the term “one surface” refers to a surface of the member surface that forms the first conductive layer 4 and the like and is disposed to face the second conductive layer 9 that acts as a counter electrode.
Further, the substrate 2 is, if the baking titanium dioxide (TiO ₂₎ as a porous semiconductor for the dye carried on the substrate a conductive film is formed after the desired conductive heat resistant glass to withstand 500 ° C. of about high heat.

The first conductive layer 4 is a conductive film having a high light transmittance made of a conductive material formed on the substrate 2. As the first conductive layer 4, for example, a transparent oxide semiconductor such as tin-added indium oxide (ITO), tin oxide (SnO ₂ ), or fluorine-added tin (FTO) is used alone, or a plurality of types are used in combination. You may do it.
Then, an electrode substrate is formed by forming the first conductive layer 4 on the base material 2.

The porous semiconductor layer 6 is obtained by supporting a dye 16 on a porous semiconductor 8. Examples of the porous semiconductor 8 include one or _{two of} titanium dioxide (TiO ₂ ), tin oxide (SnO ₂ ), tungsten oxide (WO ₃ ), zinc oxide (ZnO), niobium oxide (Nb ₂ O ₅ ), and the like. A porous thin film in which more than one species are combined, and for example, a thin film mainly composed of oxide semiconductor particles having an average particle diameter of 6 nm to 50 nm is preferable. Between the particles of the porous semiconductor 8, not only the dye 16 but also the electrolytic solution 15 is contained.
Examples of the dye 16 include organic dyes such as eosin, rhodamine, merocyanine, and coumarin in addition to a ruthenium complex, an iron complex, a porphyrin-based or phthalocyanine-based metal complex, and these can be used for a porous semiconductor layer. It is appropriately selected according to the material.

The porous insulator 7 is a porous insulator layer 5 that is obtained by soaking the electrolyte solution 15 between the particles later. For example, porous sintering of an insulator such as silicon oxide or alumina is preferably used. . In particular, by using silicon oxide as the porous insulator layer, almost no dye is adsorbed on the porous insulator layer, and even if the dye is adsorbed, it hardly affects the characteristics of the electrolyte solution. Can be improved. Further, the pore diameter of the porous insulator layer corresponds to the void diameter when the particles are filled, and when the particle diameter of the particles is 5 to 100 nm, the electrolyte having a structure in which a nonvolatile ionic liquid is gelled, It is desirable because the same effect can be obtained efficiently.
FIG. 10 is a graph showing the conversion efficiency of a dye-sensitized solar cell produced using silicon oxides having different particle diameters as the porous insulator layer. From FIG. 10, it was found that relatively high power generation efficiency can be obtained when the particle diameter is in the range of 5 to 100 nm. When the particle size is less than 5 nm, the pores become too small, and the diffusion of iodine ions in the electrolyte is inhibited, making it difficult to transport charges smoothly. When the particle size exceeds 100 nm, the porous surface area is reduced. Therefore, it is considered that a sufficient number of iodine ions hardly contributes to high-speed charge transport.

Here, the electrolyte solution 15 refers to an aqueous solution having electrical conductivity in which the electrolyte is dissociated in the solution to generate cations and anions. As the electrolytic solution 15, for example, an ionic liquid can be used in addition to a volatile electrolytic solution using methoxyacetonitrile, acetonitrile, propionitrile, ethylene carbonate, propylene carbonate, diethyl carbonate, γ-butyrolactone, or the like. . Examples of the ionic liquid include, for example, a room temperature meltable salt which is a quaternary imidazolium derivative, a quaternized pyridinium derivative, a quaternized ammonium derivative, and a compound having a quaternized nitrogen atom as a cation at room temperature. There is. By using an ionic liquid as the electrolytic solution, the power generation efficiency can be further improved.
In addition, a redox pair can be present in the electrolytic solution. Examples of the redox pair include iodine / iodide ions and bromine / bromide ions.

  The second conductive layer 9 is a conductive film made of a conductive material. The second conductive layer 9 functions as a counter electrode and also serves as a connection member between cell structures when a plurality of cell structures are connected in series. For example, the second conductive layer 9 is formed by depositing or applying a conductive oxide semiconductor such as tin-added indium oxide (ITO) or fluorine-added tin (FTO), or a conductive material such as gold, platinum, or a carbon-based material. It is formed by doing. Alternatively, a layer of platinum or carbon may be formed on a thin film made of a conductive oxide semiconductor such as tin-added indium oxide (ITO) or fluorine-added tin (FTO).

Next, the manufacturing method of the dye-sensitized solar cell 1 which concerns on this invention is demonstrated.
First, the electrode substrate is formed by forming the first conductive layer 4 on the substrate 2 such as a glass plate. The first conductive layer 4 functions as a working electrode (window electrode) in the dye-sensitized solar cell 1. As a method for forming the first conductive layer 4, a known method may be used according to the material of the first conductive layer 4. For example, sputtering, CVD (vapor deposition), SPD (spray) A thin film made of an oxide semiconductor such as tin-added indium oxide (ITO) is formed by a thermal decomposition deposition method) or an evaporation method. Thereby, the board | substrate (substrate for electrodes) which has electroconductivity only on one surface is comprised. When sunlight (indicated as hν in FIG. 2) is incident on the inside of the solar cell through this electrode substrate, the first conductive layer 4 is inferior in light transmittance when it is too thick, whereas it is inconductive when it is too thin. Since it will be inferior, the film thickness range of about 0.1 μm to 1 μm is preferable in consideration of achieving both the light transmission and conductivity functions.

Next, the working electrode is formed by forming the porous semiconductor layer 8 on the first conductive layer 4. As a method for forming the porous semiconductor layer 8, for example, a titanium dioxide (TiO ₂ ) powder is mixed with a dispersion medium to prepare a paste, and this is used for a screen printing method, an ink jet printing method, a roll coating method, a doctor blade method. And a method of coating on a conductive substrate using a spin coat method or the like. And this porous semiconductor layer 8 should just set a film thickness range so that a suitable amount of a sensitizing dye may be carried (surface adsorption), and when the film thickness is thinner than 5 μm, more light is not used, When it is thicker than 20 μm, a film thickness range of about 5 μm to 20 μm is preferable because more dyes are not used.

  In addition, the porous insulator layer 7 is formed on the porous semiconductor layer 8. As a method for forming the porous insulator layer 7, for example, a paste is prepared by mixing a silicon oxide powder with a dispersion medium, and this is the same as the porous semiconductor layer 8, using a screen printing method, an ink jet printing method, a roll. Examples of the method include coating on the porous semiconductor layer 8 using a coating method, a doctor blade method, a spin coating method, or the like. Since the porous insulator layer 7 is likely to generate pinholes when the film thickness is less than 2 μm, the counter electrode layer 9 and the porous semiconductor layer 8 to be applied (provided thereon) are formed next. If it is thicker than 20 μm, the distance between the electrodes (the distance between the first conductive layer 4 and the counter electrode layer 9) is too long and the internal resistance increases, so that the film thickness is about 2 μm to 20 μm. A range is preferred.

  Further, a second conductive layer 9 as a counter electrode is formed on the porous insulator layer 7. Examples of a method for forming the second conductive layer 9 include a method of applying the second conductive layer 9 on the porous insulator layer 7 using a screen printing method or the like. When the thickness of the second conductive layer 9 is less than 4 μm, the resistance increases. When the thickness of the second conductive layer 9 is greater than 20 μm, cracks occur in the film or on the surface of the film due to internal stress. A film thickness range of about 4 μm to 20 μm is suitable for the reason that film peeling easily occurs between the provided porous insulator layer 7.

And finally, the porous semiconductor 8 carries the dye 16 by immersing the whole in the dye solution, and the liquid electrolyte 15 is dropped on the porous semiconductor 8 and the porous insulator 7 to impregnate the electrolyte solution 15. Thus, the porous semiconductor layer 6 and the porous insulator layer 5 are obtained.
Thereby, the dye-sensitized solar cell 1 which concerns on this invention is manufactured.

In the dye-sensitized solar cell 1 configured as described above, as shown in FIG. 2, electrons have entered the porous insulator layer 5 from the second conductive layer 9 as a counter electrode (indicated as e ^{− in} FIG. 2). Reaches the porous semiconductor layer 6 efficiently by ionic conduction by flowing in the electrolyte solution 15 soaked in the pores existing between the particles of the porous insulator 7 constituting the porous insulator layer 5, Furthermore, the porous semiconductor 8 flows in the particles, reaches the base material which is the working electrode by electron conduction, and generates electricity.

  Further, the dye-sensitized solar cell 1 is remarkably improved as compared with the power generation efficiency of a conventional monolithic dye-sensitized solar cell using a solid electrolyte. As shown in FIG. Resulting in an increase).

  When the dye-sensitized solar cell 1 having the above-described configuration is enlarged, as shown in FIG. 4, a plurality of cell structures 10a, 10b, 10c,... , 10b (10b, 10c, 10c,...), The second conductive layer 9 as a counter electrode constituting one element and the first substrate provided on the base material 2 constituting the other element. The conductive layer 4 and the conductive layer 4 are sequentially connected using the second conductive layer 9 as a connection member between cell structures. And with the protection member 12a which covers all the 1st conductive layer 4, the porous semiconductor layer 6, the porous insulator layer 5, and the 2nd conductive layer 9 provided on the base material 2, the adjacent cell structure 10, The protective member 12b is formed so as to partition the ten. The protective member 12 is preferably a photo-curing resin because it does not use heat and is not damaged by the pigment.

  As a result, a load is applied to the counter electrode 9 from the outside, and the battery circuit can be prevented from being damaged or the normal operation state can be prevented by the protective member 12a. In addition, between the adjacent cell structures 10 and 10 can be prevented. , The counter electrode 9 constituting one cell structure 10 (for example, 10a) and the porous semiconductor layer 6 formed on the first conductive layer 4 constituting the other cell structure 10 (for example, 10b) are in contact with each other. The protection member 12b prevents the leakage of current and prevents leakage of the current in this portion, and promotes the flow of electrons in the direction of the counter electrode 9 → the porous insulator layer 5 → the porous semiconductor layer 6 as shown in FIG. be able to.

EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.
First, 100 mm × 100 mm × 1.1 t heat-resistant glass was used as the base material 2, and grooves were formed in a lattice circuit pattern on the upper surface by an etching method. Etching was performed using hydrofluoric acid after pattern formation by photolithography. A metal conductive layer (seed layer) was formed by sputtering in order to enable plating, and a metal wiring layer was further formed by additive plating.

  Then, a tin-added indium oxide (ITO) film having a sheet resistance of 10Ω / □ was formed as a first conductive layer to a thickness of 300 nm by a spray pyrolysis deposition method to form an electrode substrate. Thereafter, as shown in FIG. 5, the tin-added indium oxide (ITO) film was partially removed by etching so that a conductive portion having a width of 9.5 mm and an insulating portion having a width of 0.5 mm were alternately obtained.

  Next, a titanium oxide paste (Ti-nanoxide T: manufactured by Solaronix sa) having an average particle diameter of 15 nm is applied as a porous semiconductor on the conductive portion of the electrode substrate, dried in an oven, and porous having a thickness of 8 μm. A semiconductor layer was formed.

  Further, a paste containing silicon oxide nanoparticles having a particle size of 25 nm was applied thereon as a porous insulator and dried to form a porous insulator layer having a thickness of 12 μm.

  Furthermore, the carbon printing paste is printed by screen printing so as to touch the first conductive layer of the adjacent cell structure and dried to form a second conductive layer as a counter electrode that also serves as a joint with the adjacent cell structure. did.

  And after forming to the 2nd conductive layer as a counter electrode, this is baked in 450 degreeC oven for 1 hour, all the layers are sintered, and the cell structure 10 (10a, 10b, 10c ...) becomes. Nine rows were connected.

  Next, this was immersed overnight in an ethanol solution containing a ruthenium bipyridine complex (N3 dye) as a dye, and the dye was supported on the porous semiconductor layer made of the titanium oxide porous film, and EMIm-TFSI (1-Ethyl- An electrolytic solution using a 3-methylimidazolium-Bis (trifluoromethylsulfonyl) imide) ionic solution is hung on each cell structure 10a, 10b, 10c..., And placed inside the porous insulator layer and the porous insulator layer. After the electrolyte solution was included, excess electrolyte solution was removed.

  Finally, the first conductive layer, the porous semiconductor layer, the porous insulator layer, and the second conductive layer provided on the base material are all covered and photocurable so as to partition adjacent cell structures. Sealing was performed by arranging protective members 12a and 12b made of resin and curing them.

  And when the photoelectric conversion characteristic in the dye-sensitized solar cell enlarged as described above was evaluated, the power generation efficiency of the conventional monolithic dye-sensitized solar cell is only about 0.1%, whereas In such a monolithic dye-sensitized solar cell, it is remarkably increased to a level exceeding 4%. Therefore, it was found that the solar cell of the present invention can efficiently transmit electrons.

  Further, the generated current-voltage characteristic of the solar cell according to the present invention has an IV curve as shown in FIG. As is apparent from this IV curve, the solar cell of the present invention has an increased power generation current, so that a plurality of cell structures are arranged in series and connected to increase the voltage, and the characteristics can be increased. Is observed as a step equal to the number of cell structures joined together.

It is a schematic sectional drawing which shows the structure of the dye-sensitized solar cell which concerns on this invention. It is a typical partial expanded sectional view explaining the flow of electricity in the dye-sensitized solar cell shown in FIG. It is IV curve which shows the increase effect of the electric power generation efficiency in the dye-sensitized solar cell shown in FIG. It is a partial schematic sectional drawing which shows the state which connected the dye-sensitized solar cell shown in FIG. 1, and enlarged. It is a schematic plan view which shows the state which connected the dye-sensitized solar cell shown in FIG. 1, and enlarged. It is an IV curve which shows the increase effect of the power generation efficiency in the enlarged dye-sensitized solar cell shown in FIG. It is a schematic sectional drawing which shows the structure of the conventional W type | mold dye-sensitized solar cell. It is a schematic sectional drawing which shows the structure of the conventional Z-type dye-sensitized solar cell. It is a schematic sectional drawing which shows the structure of the conventional monolithic type dye-sensitized solar cell. It is a graph which shows the conversion efficiency of the dye-sensitized solar cell produced using the silicon oxide from which a particle size differs as a porous insulator layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dye-sensitized solar cell, 2 base material, 1st conductive layer, 5 porous insulator layer, 6 porous semiconductor layer, 7 porous insulator, 8 porous semiconductor, 9 2nd conductive layer (counter electrode and cell) Connecting member between structures), 10 cell structure, 12a, 12b protective member, 15 liquid electrolyte (electrolyte), 16 dye.

Claims (4)

A substrate for an electrode comprising a base material and a first conductive layer disposed on one surface of the base material, a porous semiconductor layer, a porous insulator layer, and a second conductive layer, which are sequentially stacked on the first conductive layer Comprising a cell structure composed of layers,
The dye-sensitized solar cell, wherein the porous semiconductor layer and the porous insulator layer contain an electrolytic solution therein.   The protective member is provided so as to cover all of the first conductive layer, the porous semiconductor layer, the porous insulator, and the second conductive layer and to partition between adjacent cell structures. Item 2. The dye-sensitized solar cell according to Item 1.   2. The dye-sensitized solar according to claim 1, wherein a plurality of the cell structures are connected in series, and the number of stages corresponding to the number of the cell structures is observed on a current-voltage curve. battery. A substrate for an electrode comprising a base material and a first conductive layer disposed on one surface of the base material, a porous semiconductor layer, a porous insulator layer, and a second conductive layer, which are sequentially stacked on the first conductive layer A method for producing a dye-sensitized solar cell comprising a cell structure composed of layers,
After providing a porous insulator constituting the porous insulator layer on the porous semiconductor constituting the porous semiconductor layer, and then forming the second conductive layer on the porous insulator,
A method for producing a dye-sensitized solar cell, comprising at least a step of including an electrolytic solution in the porous semiconductor and the porous insulator.

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