JP5398504B2 - Dye-sensitized photoelectric conversion element - Google Patents

Description

  The present invention relates to a photoelectric conversion element such as a dye-sensitized solar cell that can be significantly reduced in price as compared with a silicon-based conventional solar cell.

  Compared to silicon-based conventional solar cells, it is possible to significantly reduce the price, and in the dye-sensitized solar cells that are expected to be put to practical use, the impediment to price reduction is the conductivity The price of the board. However, in a dye-sensitized solar cell having a conventional structure, the electrode (window electrode) on which light enters is particularly required to have visible light transmission and high conductivity. Substrates coated with transparent conductive metal oxides such as tin-doped indium oxide and fluorine-doped tin oxide have been used. Therefore, if a dye-sensitized solar cell having a completely new structure that does not use such a transparent conductive substrate is realized, research and development are being carried out on the assumption that the price of the solar cell can be greatly reduced. .

The general dye-sensitized solar cells so far are mostly flat and stacked structures, and many of them have a structure in which various functional materials are sequentially stacked on a transparent conductive substrate. (See Non-Patent Documents 1, 2, and 3; Patent Document 1). Further, for example, a dye-sensitized solar having a structure in which a window electrode having a transparent conductive film is provided on one surface of a substrate, a porous oxide semiconductor layer supporting a dye is provided as a counter electrode, and an electrolyte layer is provided therebetween. A battery is known (see Patent Document 2).
On the other hand, in addition to the transparent conductive substrate, dye-sensitized solar cells using a metal plate or foil as an electrode are known. In these dye-sensitized solar cells, either the working electrode or the counter electrode is known. The only electrode is a metal plate or foil, and a transparent conductive substrate is always used for the light incident surface. (See Patent Documents 2, 3, and 4)
Furthermore, as a dye-sensitized solar cell having another structure, a structure having two or more electrode surfaces (see Patent Documents 3 and 4) is known.

  In addition, a structure using a part of a metal wire or a metal wire network structure as an electrode wire (see Patent Documents 5, 6, 7, and 8), a structure in which a metal wire electrode is wound around a rod-shaped counter electrode, and an electrolyte is provided around the electrode ( Patent Document 9) is known. However, in these structures, since a metal wire is used for the working electrode, it is difficult to configure a large-area solar cell module, and it is inherently an advantage that the dye-sensitized solar cell can easily be enlarged. As a result, Therefore, it is necessary to develop an element structure that does not impair the above advantages.

  As a structure of the emitting electrode that enables large-area elements, a cloth-like structure (textile structure) in which a plurality of metal wires are knitted in a mesh shape is adopted, and a structure using one or more of these emitting electrodes is also proposed. (See Patent Documents 10, 11, 12, and 13). By using the electrode having a textile structure, a large-area element can be formed, and a dye-sensitized photoelectric conversion element having a flexible structure can be provided.

FIG. 4 shows a schematic configuration diagram of a dye-sensitized photoelectric conversion element 100 including a working electrode 103 having a textile structure. FIG. 4A is a plan view of the dye-sensitized photoelectric conversion element 100. FIG. 4B is a sectional view taken along line B1-B1 in FIG.
The dye-sensitized photoelectric conversion element 100 includes a film 110 having visible light permeability, a working electrode 103, a separator 105, and a counter electrode 104 made of a metal plate.
The working electrode 103 has a textile structure in which a linear substrate 131 having conductivity is knitted in a mesh shape. The film 110 and the counter electrode 104 are sealed at the peripheral edge with an adhesive 111 to form a bag. A collecting electrode 135 made of a conductive plate is welded around the working electrode 103, and is enclosed inside the bag portion together with the electrolyte. The separator 105 is inserted between the working electrode 103 and the counter electrode 104 to insulate them.

JP 2003-0777550 A JP 2007-012448 A JP 2007-172916 A JP 2007-172917 A JP 2008-181690 A JP 2008-181691 A JP 2005-196982 A JP 2005-516370 gazette JP 2008-108508 A JP 2000-021460 A JP 2001-283941 A JP 2001-283944 A JP 2001-283945 A

O'Regan B., Graetzel M., Alow cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films, Nature, 1991, 353, 737-739 Japan Patent Office: Standard Technology Collection: “Dye-sensitized solar cell” Japan Patent Office: Patent application technology trend survey: FY 2005 “Dye-sensitized solar cell”

However, when the conventional dye-sensitized photoelectric conversion element 100 is used, when it is installed at a predetermined location, among the areas occupied by the dye-sensitized photoelectric conversion element 100 itself, there are many areas that do not contribute to power generation. Is a problem. That is, there is a problem that the ratio of the effective power generation area to the area of the dye-sensitized photoelectric conversion element 100 itself is small.
In the plan view shown in FIG. 4A, the mesh portion of the working electrode 3 is an area contributing to power generation (effective power generation area). With respect to this effective power generation area, the area of the sealing portion (indicated by reference numeral S10 in FIG. 4 (a)) required for bonding the film 110 and the counter electrode 104 is large, so Power generation efficiency will decrease.

It is possible to increase the ratio of the effective power generation area by reducing the area of the sealing portion S10. However, if the area of the sealing portion S10 is reduced, it becomes difficult to ensure the liquid-tightness of the bag composed of the counter electrode 104 and the film 110, and the product life of the dye-sensitized photoelectric conversion element 100 is shortened. Such problems arise.
Therefore, there is a demand for a dye-sensitized photoelectric conversion element capable of increasing the power generation efficiency per unit area by reducing the area of the sealing portion in the installation area while maintaining the liquid tightness of the bag body. Yes.

The above-mentioned subject is achieved by the following present invention.
The invention according to claim 1 of the present invention is such that a film having visible light permeability and a counter electrode made of a metal plate are overlapped, and a sealing portion made of a portion where the film and the counter electrode are in contact is provided. The formed bag body, the working electrode enclosed in the bag body, having a structure in which a plurality of conductive wires are knitted in a mesh shape, and arranged to face one surface of the counter electrode, And a dye-sensitized photoelectric conversion element comprising at least an electrolyte enclosed in the bag together with the working electrode, wherein at least a part of the sealing portion faces the working electrode of the counter electrode In the dye-sensitized photoelectric conversion element, the film is extended to the opposite side of the side, and the film is bonded to the other side of the counter electrode on the opposite side.
In the invention according to claim 2 of the present invention, the sealing portion is provided in a portion excluding a region where the working electrode and the collecting electrode of the counter electrode are interposed. This is a dye-sensitized photoelectric conversion element.
Furthermore, the invention according to claim 3 of the present invention is characterized in that the sealing portion is provided also in a region where the working electrode and the collector electrode of the counter electrode exist. It is a sensitive photoelectric conversion element.

  In the dye-sensitized photoelectric conversion element according to the present invention, the film is extended to the opposite side of the counter electrode, and the sealing part in which the film is bonded to the counter electrode on the opposite side is a part of the sealing part. Therefore, compared with the conventional dye-sensitized photoelectric conversion element, the ratio of the area of the sealing portion to the occupied area of the dye-sensitized photoelectric conversion element can be reduced, resulting in power generation per unit area. The efficiency can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the dye-sensitized photoelectric conversion element which concerns on this invention is shown, (a) is a top view, (b) is sectional drawing which follows the BB line of (a), (c) is (a) It is sectional drawing in alignment with CC line | wire. It is a figure which shows the manufacturing process of the dye-sensitized photoelectric conversion element which concerns on this invention. It is a figure which shows another form of the dye-sensitized photoelectric conversion element which concerns on this invention. The schematic block diagram which showed an example of the conventional dye-sensitized photoelectric conversion element is shown, (a) is a top view, (b) is sectional drawing which follows the B1-B1 line | wire of (a).

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a drawing showing a first embodiment of the dye-sensitized photoelectric conversion element of the present invention. FIG. 1 (a) is a plan view of the dye-sensitized photoelectric conversion element 1, and FIG. 1A is a cross-sectional view taken along line BB in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line CC in FIG.
The dye-sensitized photoelectric conversion element 1 of the present invention includes a working electrode 3, a counter electrode 4, a separator 5, and a film 10 having visible light transmittance, all having a rectangular shape, as main components.
The film 10 and the counter electrode 4 made of a metal plate are superposed, and a bag is formed by providing sealing portions S1 and S2 each having a portion where the film 10 and the counter electrode 4 are in contact with each other at the periphery. .

As best shown in the plan view of FIG. 1A, the working electrode 3 has a textile structure in which a plurality of linear base materials 31 are knitted in a mesh shape.
Since a linear base material (wire) is used without using a plate-like substrate, and a plurality of base materials are knitted like cloth, it is relatively easy to increase the area and is not knitted. Compared to a device manufactured using a single metal wire, a flexible device with better shape stability can be constructed. Furthermore, unlike a conventional photoelectric conversion element, since a transparent conductive substrate (for example, a substrate in which a transparent conductive film is provided on a glass substrate) is not used, the element can be manufactured at low cost.

Around the working electrode 3, a porous oxide semiconductor layer 12 carrying a dye is disposed, and the porous oxide semiconductor layer 12 is impregnated with an electrolyte 13 together with a sensitizing dye.
A conductive plate-like collecting electrode 35 is electrically connected around the working electrode 3 by welding. The collecting electrode 35 is welded to the warp of the base material 31 constituting the working electrode 3 or the end of the weft in order to collect electrons generated at the working electrode 3 more efficiently.

  The working electrode 3 is sealed together with the electrolyte 13 in the bag so as to face one surface of the counter electrode 4. A separator 5 is inserted between the working electrode 3 and the counter electrode 4 in order to insulate them.

The sealing portions S1 and S2 are provided on the four sides of the film 10 and the counter electrode 4, and are formed by placing an adhesive 11 between the film 10 and the counter electrode 4 and thermocompression bonding. The sealing portion S1 is a sealing portion provided on the short side (side along the short direction) of the four sides, and the sealing portion S2 is a sealing provided on the long side (side along the longitudinal direction). Part.
A protruding portion 35a is formed on the collecting electrode 35 welded to the working electrode 3, and the protruding portion 35a extends through the sealing portion S1 to the outside of the bag body. Moreover, the protrusion 4a is formed also in the counter electrode 4, and even when the dye-sensitized photoelectric conversion element 1 is installed in a predetermined location, current collection is possible. The sealing portion S1 is provided in a region where the collecting electrodes 35a and 4a of the working electrode 3 and the counter electrode 4 exist.

  In the dye-sensitized photoelectric conversion element 1 of the present invention, of the sealing portions S1 and S2, the sealing portion S2 is not the light receiving side of the counter electrode 4 (the front side in FIG. 1A), but the counter electrode 4 It is also provided on the opposite side (other side, hereinafter referred to as back side). The light receiving side of the counter electrode 4 is the side facing the working electrode 3 among the two surfaces constituting the counter electrode 4.

The sealing part S1 on the short side of the dye-sensitized photoelectric conversion element 1 having a rectangular shape is provided on the light receiving side as in the conventional case. The adhesive 11 is on the light receiving side of the counter electrode 4 and is disposed between the counter electrode 4 and the film 10.
On the other hand, the long-side sealing portion S <b> 2 is formed by extending the film 10 to the back side of the counter electrode 4 and then bonding the extended film 10 to the back side of the counter electrode 4. The adhesive 11 is disposed on the back side of the counter electrode 4.
That is, in the conventional dye-sensitized photoelectric conversion element, only the surface on the light receiving side of the counter electrode is used for bonding the film to the counter electrode, whereas the dye-sensitized photoelectric conversion element of the present invention is used. 1 adheres the film 10 and the counter electrode 4 using the back side of the counter electrode 4.
According to this configuration, on the light receiving side surface of the counter electrode 4, the area corresponding to the bonding allowance of the sealing portion can be limited to only the S1 portion. Therefore, the width in the short direction of the dye-sensitized photoelectric conversion element 1 Can be reduced.

  Next, with reference to FIG. 2, the manufacturing method of the dye-sensitized photoelectric conversion element 1 of this invention is demonstrated. The following description explains the arrangement of the working electrode 3, the counter electrode 4, the separator 5, and the film 10, and the bonding method, and other matters (for example, encapsulation of the electrolyte, etc.) will not be described here.

(A) On the counter electrode 4, the separator 5 and the working electrode 3 to which the collector electrode 35 is welded (hereinafter referred to as working electrode 3) are stacked. Here, the width of the counter electrode 4 and the working electrode 3 in the short direction is W1.
(B) The film 10 having a width W2 having a predetermined width larger than the width W1 is disposed on the working electrode 3 and bonded to the short side of the counter electrode 4. Adhesion is performed by thermocompression bonding after the adhesive 11 is disposed between the film 10 and the counter electrode 4.
(C) The side portion of the film 10 is folded back to the back side of the counter electrode 4.
(D) A folded portion is bonded to the back side of the counter electrode 4.

Hereinafter, the components of the dye-sensitized photoelectric conversion element 1 of the present invention will be described in detail.
The working electrode 3 has a structure in which a plurality of linear base materials 31 are knitted in a cloth shape so as to sufficiently come into contact with each other at the overlapping portion. The base material 31 constituting the working electrode 3 is a wire made of Ti. Of course, the material constituting the substrate 31 is not limited to Ti, and metals having high corrosion resistance such as W and Pt and alloys thereof can also be used. Further, for example, a Ti-coated metal wire coated with a linear substrate made of a material that is electrically conductive and electrochemically inactive with respect to the electrolyte 13 with Ti or the like is used as the substrate 31. Can do.
Further, as the base material 31, not only a normal wire having a circular cross section but also a deformed wire such as a flat wire or a polygonal wire can be used.

Hereinafter, an example of a method for producing a Ti-coated Cu wire as a Ti-coated metal wire will be described.
First, Ti is formed into a pipe shape by extrusion molding or the like, and Cu is formed into a linear shape by extrusion molding or the like, and while the Ti pipe and the Cu wire are run simultaneously, a Cu wire is inserted inside the Ti pipe, These are squeezed to bring them into close contact to obtain a Ti-coated Cu wire.
The thickness (diameter) of the base material 31 is preferably 10 μm to 1 mm, for example. However, in order to sufficiently exhibit flexibility, the thickness of the base material 31 is preferably as thin as possible.

A porous oxide semiconductor layer 12 is disposed on the surface of the working electrode 3, and a sensitizing dye and an electrolyte 13 are supported on at least a part of the surface.
The semiconductor that forms the porous oxide semiconductor layer 12 is titanium oxide (TiO ₂ ). The thickness of the titanium oxide is about 5 μm, but is not particularly limited, and may be, for example, 1 μm to 50 μm.
The semiconductor that forms the porous oxide semiconductor layer 12 is not limited to titanium oxide, and is generally zinc oxide (ZnO), tin oxide (SnO ₂ ), oxidation, as long as it is used in dye-sensitized solar cells. Various semiconductor electrodes such as zinc (ZnO), niobium oxide (Nb ₂ O ₅ ), and tungsten oxide (WO ₃ ) can be used without limitation.

  Examples of the sensitizing dye include ruthenium complexes such as N719, N3, and black dye, metal-containing complexes such as porphyrin and phthalocyanine, and organic dyes such as eosin, rhodamine, and merocyanine. From the above, it is only necessary to appropriately select one having an excitation behavior suitable for the application and the semiconductor used.

  The porous oxide semiconductor layer 12 is impregnated with an electrolytic solution, and this electrolytic solution also constitutes a part of the electrolyte 13. In this case, the electrolyte 13 in the porous oxide semiconductor layer 12 is formed by impregnating the porous oxide semiconductor layer 12 with the electrolytic solution, or impregnating the porous oxide semiconductor layer 12 with the electrolytic solution. Then, the electrolytic solution is gelled (pseudo-solidified) using an appropriate gelling agent and formed integrally with the porous oxide semiconductor layer 12, or based on an ionic liquid. Further, a gel electrolyte containing oxide semiconductor particles and conductive particles is used.

As said electrolyte solution, what melt | dissolved electrolyte components, such as an iodine, iodide ion, and tertiary butyl pyridine, in organic solvents and ionic liquids, such as ethylene carbonate and methoxyacetonitrile, is used.
Examples of the gelling agent used for gelling the electrolytic solution include polyvinylidene fluoride, a polyethylene oxide derivative, and an amino acid derivative.
Moreover, if it replaces with a volatile electrolyte solution and is generally used for a dye-sensitized solar cell, not only what a solvent is an ionic liquid or the gelatinized thing but a p-type inorganic semiconductor and an organic hole transport layer Even solids such as these can be used without limitation.

Although it does not specifically limit as said ionic liquid, It is a liquid at room temperature, For example, the normal temperature molten salt which used the compound which has the quaternized nitrogen atom as a cation is mentioned.
Examples of the cation of the room temperature molten salt include quaternized imidazolium derivatives, quaternized pyridinium derivatives, and quaternized ammonium derivatives.
Examples of the anion of the room temperature molten salt include BF ₄ ⁻ , PF ₆ ⁻ , (HF) _n ⁻ , bistrifluoromethylsulfonylimide [N (CF ₃ SO ₂ ) ₂ ⁻ ], and iodide ions.
Specific examples of the ionic liquid include salts composed of quaternized imidazolium-based cations and iodide ions or bistrifluoromethylsulfonylimide ions.

  The oxide semiconductor particles are not particularly limited in terms of the type and particle size of the substance, but are excellent in miscibility with an electrolyte mainly composed of an ionic liquid and gel the electrolyte. Is used. In addition, the oxide semiconductor particles are required to have excellent scientific stability against other coexisting components contained in the electrolyte 13 without reducing the semiconductivity of the electrolyte 13. In particular, even when the electrolyte 13 includes a redox pair such as iodine / iodide ions or bromine / bromide ions, the oxide semiconductor particles are preferably those that do not deteriorate due to an oxidation reaction.

Examples of such oxide semiconductor particles include TiO ₂ , SnO ₂ , SiO ₂ , ZnO, Nb ₂ O ₅ , In ₂ O ₃ , ZrO ₂ , Al ₂ O ₃ , WO ₃ , SrTiO ₃ , Ta ₂ O ₅ , One or a mixture of two or more selected from the group consisting of La ₂ O ₃ , Y ₂ O ₃ , Ho ₂ O ₃ , Bi ₂ O ₃ , CeO ₂ is preferable, and the average particle size is about 2 nm to 1000 nm. preferable.

As the conductive fine particles, conductive particles such as a conductor and a semiconductor are used.
Further, the type and particle size of the conductive particles are not particularly limited, and those that are excellent in miscibility with an electrolytic solution mainly composed of an ionic liquid and that gel the electrolytic solution are used. Furthermore, it is necessary to be excellent in chemical stability against other coexisting components contained in the electrolyte 13.
In particular, even when the electrolyte 13 includes a redox pair such as iodine / iodide ions or bromine / bromide ions, an electrolyte that does not deteriorate due to an oxidation reaction is preferable.

  Examples of such conductive fine particles include those composed mainly of carbon, and specific examples include particles such as carbon nanotubes, carbon fibers, and carbon black. All methods for producing these substances are known, and commercially available products can also be used.

The counter electrode 4 is formed of a Ti plate having a conductive plate shape and a non-conductive surface. The counter electrode 4 has a catalyst film (not shown) made of Pt on the surface facing the working electrode 3.
The configuration of the counter electrode 4 is not limited to the Pt-coated Ti plate as described above, and may be a Pt plate or a metal plate coated with Pt. Alternatively, it may be a carbon plate or a metal plate coated with carbon. Further, the counter electrode 4 may be configured to employ a textile structure in which a linear substrate having conductivity is knitted in a mesh shape to coat Pt.

  The separator 5 is preferably a non-woven fabric made of polyethylene, but is not limited thereto, and a plate-like resin may be adopted. As for the material, various materials can be adopted without being limited to polyethylene as long as they can withstand the electrolytic solution and insulate the working electrode 3 and the counter electrode 4.

  The film 10 having visible light permeability is formed of a high gas barrier transparent film using PET as a substrate. In addition to the PET substrate, other glass substrates and resin substrates such as polyethylene naphthalate and fluororesin can be used without limitation as long as they are resins used for dye-sensitized solar cells.

  The adhesive 11 for adhering the film 5 includes a resin having a polar group or a modified resin film having a polar group introduced therein, for example, an ethylene copolymer having a polar group in a molecular chain such as EMAA or ionomer. Alternatively, an acid-modified product of polyolefin such as polyethylene or polypropylene can be used. Specific examples include High Milan, Nuclerel (Mitsui DuPont Polychemical), Binnel (DuPont), Adtex (Nippon Polyethylene), Primacol (Dow Chemical).

  The collector electrode 35 is preferably a Ti plate having a thickness of 100 μm, but is not limited to this as long as it is conductive and can withstand an electrolyte.

Second Embodiment
Hereinafter, 2nd Embodiment of the photoelectric conversion element which concerns on this invention is described based on drawing.
FIG. 3 is a schematic configuration diagram of a dye-sensitized photoelectric conversion element according to the second embodiment of the present invention, in which FIG. 3A shows a light receiving side of the photoelectric conversion element, and FIG. 3B shows a back side.
The dye-sensitized photoelectric conversion element of the second embodiment is characterized in that all of the sealing portion is provided on the back side of the counter electrode 4b, and this point is different from that of the first embodiment.

  In the dye-sensitized photoelectric conversion element 1b, the working electrode 3b provided with the collector electrode 35b and the counter electrode 4b have a rectangular shape in plan view. The film 10b has a predetermined dimension longer than the working electrode 3b and the counter electrode 4b both in the vertical dimension and in the horizontal dimension.

When assembling, the end portion of the film 10b is all folded into the back side of the counter electrode 4b, and then the film 10b is adhered to the back surface of the counter electrode 4b to form sealing portions S1b and S2b.
For collecting current from the working electrode 3b, at least one collecting wire 35b electrically connected to the collecting electrode 35b of the working electrode 3b is used. Further, at least a part of the counter electrode 4b is exposed on the back side of the counter electrode 4b.
In this structure, since all the sealing portions are provided on the back side of the counter electrode 4b, the area of the dye-sensitized photoelectric conversion element 1b can be further reduced as compared with the first embodiment.

(Example)
A photoelectric conversion element having the structure shown in FIG. 1 was produced.
First, a Ti wire (base material 31) having a diameter of 50 μm was woven into a dense plain weave (textile) structure by a loom. The size of the rectangular portion (textile portion) where the vertical and horizontal Ti wires are woven is 50 mm × 100 mm.

  Ti having a thickness of 100 μm and a width of 5 mm was attached to the three sides of the outer periphery of the woven fabric as a collecting electrode 35 by welding. A protruding portion 35 a is provided on one side of the collector electrode 35.

The textile part to which the collecting electrode 35 is attached is dipped in a TiO ₂ paste (PST-21NR manufactured by Catalytic Chemicals), pulled up, temporarily dried, and then sintered in an electric furnace at 500 ° C. for 1 hour with a porous TiO ₂ film Ti textile part was obtained. The film thickness of TiO ₂ was approximately 15 μm.

Next, the working electrode 3 was dipped in a 0.3 mM, acetonitrile / tert-butanol = 1: 1 solution of ruthenium dye (referred to as N719) and allowed to stand at room temperature for 24 hours to carry the dye on the TiO ₂ surface. After lifting from the dye solution, it was washed with the above mixed solvent, and this was used as working electrode 3.

  On the other hand, a counter electrode 4 was obtained by depositing Pt on a 50 × 115 mm Ti plate using a ternary RF sputtering apparatus.

As the film 10, a PET film having a thickness of 50 μm and a size of 70 × 110 mm was used.
As the separator 5, a nonwoven fabric made of polyethylene and having a thickness of 16 μm and a porosity of 38% was used. The size was 50 × 100 mm.

  After the working electrode 3, the separator 10, and the counter electrode 4 are stacked in order (see FIG. 2A), the film 10 is disposed so as to cover the working electrode 3, and the short sides are bonded (see FIG. 2B). . Adhesion was performed by thermocompression bonding with a nucleolate that is an ethylene-methacrylic acid copolymer inserted between the film 10 and the counter electrode 4.

  Next, the end of the film was folded (see FIG. 2C), and the folded portion was bonded to the back side of the counter electrode 4 (see FIG. 2D). When bonding, a volatile electrolyte using methoxyacetonitrile as a solvent was injected between the film 10 and the counter electrode 4.

The photoelectric conversion element produced as described above was irradiated with light with a solar simulator (AM1.5, 100 mW / cm ² ), and a current-potential curve was measured. As a result, the photoelectric conversion efficiency was 4.0%.

  From the above, according to the present invention, the ratio of the area of the sealing portion to the occupied area of the dye-sensitized photoelectric conversion element can be reduced, and as a result, the power generation efficiency per unit area can be increased. It became.

  The present invention is widely applicable to photoelectric conversion elements using metal wires as electrodes.

DESCRIPTION OF SYMBOLS 1 ... Dye-sensitized photoelectric conversion element, 3 ... Working electrode, 4 ... Counter electrode, 5 ... Separator, 10 ... Film, 11 ... Adhesive, 12 ... Porous oxide semiconductor layer, 13 ... Electrolyte, 31 ... Base material, 35 ... collector electrode, S1, S2 ... sealing part.

Claims (3)

A bag formed by overlaying a film having visible light permeability and a counter electrode made of a metal plate, and providing a sealing portion made of a portion where the film and the counter electrode are in contact,
A working electrode enclosed in the bag body, having a structure in which a plurality of conductive wires are knitted in a mesh shape, and arranged to face one surface of the counter electrode,
And an electrolyte enclosed in the bag together with the working electrode,
A dye-sensitized photoelectric conversion element comprising at least
At least a part of the sealing portion is formed by extending the film to the opposite side of the counter electrode facing the working electrode and bonding the film to the other surface of the counter electrode on the opposite side. A dye-sensitized photoelectric conversion element characterized by   The dye-sensitized photoelectric conversion element according to claim 1, wherein the sealing portion is provided in a portion excluding a region where the working electrode and the collector electrode of the counter electrode exist.   The dye-sensitized photoelectric conversion element according to claim 2, wherein the sealing portion is also provided in a region where the working electrode and the counter electrode collecting electrode exist.

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