JP5485793B2 - Solar cell module connection electrode and solar cell module - Google Patents

Description

  The present invention relates to a connection electrode of a solar cell module and a solar cell module.

The dye-sensitized solar cell is called a wet solar cell or a Gretzel battery, and is characterized in that it has an electrochemical cell structure typified by an iodine solution without using a silicon semiconductor. In general, a titanium dioxide powder or the like is baked on a transparent substrate with a transparent conductive film, and a dye is adsorbed to the porous semiconductor layer such as titanium dioxide and a counter electrode made of a conductive substrate, for example, hot melt After the peripheral portion is sealed with a sealing material such as a film, an iodine solution or the like is disposed as an electrolyte in the sealed interior.
In the dye-sensitized solar cell, when light is irradiated, electrons are generated by exciting the adsorbed dye. Porous semiconductors in which the generated electrons pass through the transparent conductive film layer serving as the anode electrode, move to the opposing conductive substrate through the external electric circuit, and the transferred electrons are carried by the ions in the electrolyte to adsorb the dye Return to the layer. Electrical energy is extracted by repeating such a series of electron movements.
Dye-sensitized solar cells are attracting attention as low-cost solar cells because they are inexpensive and do not require large-scale equipment for production.

One of the major issues for the practical application of dye-sensitized solar cells is the extraction of high voltage.
Since it is difficult to obtain a high voltage with one dye-sensitized solar cell, a plurality of dye-sensitized solar cells are connected in series.

For example, a module obtained by improving a dye-sensitized solar cell module called a Z-type module has been proposed (see Patent Document 1).
The Z-type module electrically connects a transparent conductive film layer on the anode side of one dye-sensitized solar cell and a conductive substrate on the cathode side of another adjacent dye-sensitized solar cell. The electrical connection is repeated for a large number of dye-sensitized solar cells to form one module. However, since the Z-type module requires two substrates, it is not suitable for reducing the thickness and weight. The improved module uses only one substrate and thins the counter electrode.
However, in either the Z module structure or the improved Z module structure, in order to connect the dye-sensitized solar cells in series, the conductive paste is used to connect the adjacent dye-sensitized solar cells, When the number connected in series increases, the internal electrical resistance increases accordingly, and the power generation efficiency may decrease.

For example, a module obtained by improving a dye-sensitized solar cell module called a W-type module has been proposed (see Patent Document 2).
In the W-type module, adjacent dye-sensitized solar cells are inverted 180 degrees vertically, a dye-sensitized solar cell in which light enters from the transparent conductive film side, and a dye-sensitized solar in which light enters from the conductive substrate side It takes a structure in which batteries are arranged alternately. However, the W-type module needs to change the area of adjacent cells so that the current of each cell (battery) becomes constant, and there is a problem that the photoelectric conversion efficiency of the entire module is lowered. In the improved module, the light receiving area of a cell having a low unit area output current is made larger than the light receiving area of a cell having a high unit area output current.
In either the W-type module structure or the improved W-module structure, since only the insulating layer is formed between the dye-sensitized solar cells, it is easy to reduce the non-power generation area compared to the Z-type module. In addition, the connection between the dye-sensitized solar cells can directly connect the adjacent transparent conductive film layer and the conductive substrate in series, the connection portion is short, and no conductive material is required.
However, in either the W-type module structure or the improved W-module structure, the dye-sensitized solar cell in which light is incident from the conductive substrate side has a conductive substrate in order to efficiently make light incident on the conductive substrate. The metal catalyst layer disposed on the electrolyte side is very thin and the electrical resistance is high. Therefore, the fill factor, which is a curve factor in the current-voltage characteristics at the time of photoelectric conversion, may decrease, and power generation efficiency may also decrease.

JP 2009-110696 A JP 2009-9851 A

  The problem to be solved is that, in a conventional solar cell module in which battery cells are connected in series, there is a limit to the improvement in power generation efficiency of the module due to the connection structure.

The connection electrode of the solar cell module according to the present invention is a metal conductive layer in which both ends of the insulating layer on both sides different from each other are overlapped in the vicinity of the center of the insulating layer in a plan view shorter than the insulating layer. A connection electrode in which the layer portion is disposed and the overlapping portion is electrically connected to the interlayer,
It has the same structure and is arranged between adjacent solar cells with the light receiving surface facing in the same direction, and one metal conductive layer portion is electrically connected to the cathode electrode of one solar cell and the other metal conductive The layer portion is electrically connected to an anode electrode of a solar cell adjacent to the one solar cell.

  Moreover, the connection electrode of the solar cell module according to the present invention is preferably characterized in that the overlapping portion is interlayer-connected by a through hole.

  Moreover, the connection electrode of the solar cell module according to the present invention is preferably characterized in that the solar cell is a dye-sensitized solar cell.

  Moreover, the solar cell module according to the present invention includes the connection electrode of the solar cell module.

The connection electrode of the solar cell module according to the present invention is a metal conductive layer portion in which both ends of the insulating layer on both sides different from each other are shorter than the insulating layer and only one end portion overlaps near the center of the insulating layer in plan view. Is a connecting electrode that is electrically connected to the interlayer at the overlapping portion, and is disposed between adjacent solar cells having the same structure with the light receiving surface facing in the same direction, and one metal conductive layer portion Is electrically connected to the cathode electrode of one solar cell, and the other metal conductive layer portion is electrically connected to the anode electrode of the solar cell adjacent to the one solar cell. Can be improved.
Moreover, since the solar cell module which concerns on this invention has a connection electrode of said solar cell module, the effect of a connection electrode can be obtained suitably.

FIG. 1 is a plan view of a connection electrode according to the present embodiment. FIG. 2 is a diagram showing a schematic configuration of the dye-sensitized solar cell solar cell module according to the first example of the present embodiment. FIG. 3 is a diagram showing a schematic configuration of a dye-sensitized solar cell solar cell module according to a second example of the present embodiment.

  Embodiments of the present invention will be described below with reference to the drawings, taking a dye-sensitized solar cell as an example of a solar cell.

First, the connection electrode according to the present embodiment will be described with reference to FIG.
In the plan view of the connection electrode shown in FIG. 1, the connection electrode 10 according to the present embodiment is provided with metal conductive layer portions 14 and 16 on both surfaces of the insulating layer 12. Each of the metal conductive layer portions 14 and 16 is shorter than the insulating layer 12, so that only one end portion overlaps with both end portions on different sides of the insulating layer 12 in the vicinity of the center in the longitudinal direction of the insulating layer 12. Provided. The overlapping portions of the metal conductive layer portions 14 and 16 are electrically connected to each other through through holes 18.

As the material of the insulating layer 12, any material may be used as long as the porous conductive metal layer and the conductive substrate are insulated from each other in the dye-sensitized solar cell module described later without swelling or eluting into the electrolyte. . For example, in the case of a ceramic material, it is desirable to be formed of aluminum oxide, zirconium oxide or the like. In the case of a plastic material, it is preferably formed of a polyolefin plastic, a polyvinyl plastic, a polyester plastic, a polyimide plastic, or the like.
The thickness of the insulating layer 12 is preferably 10 μm or more. When the thickness is less than 10 μm, there is a risk of leakage or short circuit between the porous conductive metal layer of the dye-sensitized solar cell and the conductive substrate. In addition, by appropriately adjusting the thickness of the insulating layer 12, the desired metal conductive layer portions 14 and 16 with different heights can be obtained.

The material of the metal conductive layer portions 14 and 16 is one or more metal materials selected from the group consisting of Ti, W, Ni, Zr, V, Nb, Cr, Mo, Pt, and Au, or a compound material thereof. It is preferable that the material is formed of or coated with these materials. Thereby, the metal conductive layer part with favorable corrosion resistance with respect to the iodine etc. in electrolyte can be obtained.
The thicknesses of the metal conductive layer portions 14 and 16 are each preferably 250 nm or more, and the total thickness is preferably within 150 μm. If each thickness is less than 250 nm, the electrical resistance may increase. On the other hand, if the total thickness exceeds 150 μm, the distance between the porous conductive metal layer and the conductive substrate becomes too large, which may cause a decrease in power generation efficiency.

The through hole 18 is obtained by forming a metal layer or a metal film on the inner wall surface of the through hole formed in the insulating layer 12 in order to establish conduction between the metal conductive layer portions 14 and 16. The through-hole 18 can be provided with a plating layer by performing, for example, electroless plating and electrolytic plating. Further, the through hole 18 may be, for example, a metal paste filled in a through hole.
Note that the through hole for forming the through hole 18 is formed by, for example, using a carbon dioxide gas laser in advance by applying an etching resist to the metal conductive layer portion 16 in advance, exposing, developing, etching, and the like in order. Then, a through-hole in which the metal conductive layer portion 14 is exposed on the bottom surface can be formed by irradiating the carbon dioxide laser toward the opening where the surface of the insulating layer 12 is exposed. Moreover, the through-hole which has a desired diameter can be formed by restrict | squeezing the beam diameter of a carbon dioxide gas laser with an optical system. The through hole is plated in the same manner as described above to obtain a through hole 18 that establishes conduction between the upper and lower metal conductive layer portions 14 and 16.
The interlayer connection may be performed by, for example, a via hole instead of the through hole, and may be performed by another method that does not require an opening.

  A connection electrode and a dye-sensitized solar cell module of the dye-sensitized solar cell module according to the first example of the present embodiment using the connection electrode 10 will be described with reference to FIG.

In the dye-sensitized solar cell module 20 having a schematic configuration shown in FIG. 2, a plurality of dye-sensitized solar cells 22 having the same structure are electrically connected in series with their light receiving surfaces facing in the same direction. Here, the plurality of dye-sensitized solar cells 22 having the same structure means that each dye-sensitized solar cell 22 includes a transparent substrate as a light receiving surface and a conductive substrate as a counter substrate. Although FIG. 2 shows an example in which two dye-sensitized solar cells 22 are connected in series, it goes without saying that the number of dye-sensitized solar cells 22 connected in series is not limited. The same applies to the following other examples. The several dye-sensitized solar cell 22 has the following structures similar to a normal dye-sensitized solar cell.
The dye-sensitized solar cell 22 includes a transparent substrate 24 shared by the plurality of dye-sensitized solar cells 22 and a conductive substrate 26 provided to face the transparent substrate 24. The conductive substrate 26 includes a substrate 26a and a conductive metal layer 26b provided on the substrate 26a. The transparent substrate 24 may be individually provided for each dye-sensitized solar cell 22.
The porous half-layer body layer 28 adsorbing a dye disposed between or adjacent to the transparent substrate 24 and the conductive substrate 26 is opposite to the transparent substrate 24 of the porous semiconductor layer 28. A conductive metal layer 30 having a through-hole disposed on the side and a porous insulating layer 32 disposed on the opposite side of the conductive metal layer 30 from the porous semiconductor layer 28 are provided. The porous insulating layer 32 may be omitted.
In the dye-sensitized solar cell module 20, the peripheral portions of the transparent substrate 24 and the conductive substrate 26 are sealed with a sealing material 35, and an electrolyte (electrolytic solution) 33 is sealed inside the sealing material 35. Further, a sealing material 35 as a partition wall is also provided between the adjacent dye-sensitized solar cells 22 and 22.

In the connection electrode 10 provided between the adjacent dye-sensitized solar cells 22, 22, the metal conductive layer portion 14 is electrically connected to the conductive metal layer (cathode electrode) 26b of the solar cell 22 on the left side in FIG. In addition, the metal conductive layer portion 16 is electrically connected to the conductive metal layer (anode electrode) 30 of the solar cell 22 on the right side in FIG. 2 at both left and right ends in FIG. 2 of the dye-sensitized solar cell module 20. An extraction electrode is provided. The structure of the extraction electrode is not particularly limited as long as the electrode has an appropriate structure extending from the sealing material 35.
The extraction electrode 34 shown in FIG. 2 has a structure in which metal conductive layers 38 and 40 are disposed on both surfaces of the insulating layer 36, respectively. In the left extraction electrode 34 in FIG. 2, the metal conductive layer 40 is electrically connected to the conductive metal layer 30 of the left dye-sensitized solar cell 22. On the other hand, in the extraction electrode 34 on the right side in FIG. 2, the metal conductive layer 40 is electrically connected to the conductive metal layer 26 b of the right dye-sensitized solar cell 22. A metal conductive layer (for example, the metal conductive layer 38 of the extraction electrode 34 on the left side in FIG. 2) that is not electrically connected to the dye-sensitized solar cell 22 of the extraction electrode 34 is not necessarily provided. The layer structure serves as a spacer and helps stabilize the distance between the conductive metal layer 30 and the conductive substrate 26.

The extraction electrode 34 can be produced by, for example, a method for producing a double-sided metal foil-clad laminate. For example, the metal conductive layers 38 and 40 can be overlapped on both sides of the insulating layer 36 and thermocompression bonded. As for the production conditions of the three-layer body by the thermocompression bonding method, the heating conditions are preferably 80 to 200 ° C. Further, the pressure condition is preferably 0.001 to 0.2 MPa.
Further, the metal conductive layers 38 and 40 may be formed on the insulating layer 36 by a coating method, a thin film forming method, or a thermal spraying method. In the case of the coating method, a paste of metal particles that is a material of the metal conductive layers 38 and 40 is printed on the insulating layer 26, heated, dried, and further fired. On the other hand, in the case of the thin film formation method, the metal conductive layers 38 and 40 are formed on the insulating layer 36 by sputtering, vacuum deposition, plating, or the like.
Further, a varnish or a varnish precursor as an insulating layer material is applied onto one metal conductive layer of the metal conductive layers 38 and 40, and after drying or heat treatment, the other metal conductive layer of the metal conductive layers 38 and 40 is used as an insulating layer. It may be superposed on the varnish and thermocompression bonded.

  The dye-sensitized solar cell 22 can have the same configuration as that of a normal dye-sensitized solar cell with respect to the other components except the connection electrode 10 and the extraction electrode 34. A brief description is given below.

The material of the transparent substrate 24 may be, for example, a glass plate or a plastic plate. When using plastic plates, for example, PP, PE, PS, ABS, PS, PC, PMMA, PVC, PA, POM, PET, PEN, polyimide, polyamide, polyolefin, polyester, polyether, cured acrylic resin, cured epoxy resin , Cured silicone resins, various engineering plastics, and materials such as cyclic polymers obtained by metathesis polymerization.
Moreover, in order to improve the utilization efficiency of the light incident on the transparent substrate 24, an antireflection film can be provided on the outermost surface.

As the conductive substrate 26, a substrate 26a similar to the transparent substrate 24 is used, and a conductive metal layer 26b is provided on the surface of the substrate 26a facing the electrolyte 33. The conductive metal layer 26b is made of, for example, ITO (indium oxide film doped with tin), FTO (tin oxide film doped with fluorine), SnO2 film, or Ti, W, Ni, Pt, Ta, Nb, Zr, and Au. 1 type or 2 or more types of metal materials selected from the group consisting of these or a compound thereof, a material coated with these metals, and a conductive film such as carbon are laminated, and a noble metal such as a platinum film or the like is further deposited on the conductive film. A catalyst film of surface area carbon and catalytic conductive polymer is provided.
Further, the conductive substrate 26 may be one or more metal materials selected from the group consisting of Ti, W, Ni, Pt, Ta, Nb, Zr and Au, or these materials, unless it is necessary to be translucent. A compound, a material coated with these metals, and a conductive film such as carbon are laminated, and a noble metal such as a platinum film, high surface area carbon, or a catalytic film of a conductive polymer is provided on the conductive film.

The porous half layer layer 28 may be made of any suitable material such as ZnO, SnO2, niobium oxide, indium oxide, tungsten oxide, etc., but TiO2 is preferred. The shape of fine particles such as TiO2 is not particularly limited, but is preferably about 1 nm to 400 nm.
The thickness of the porous semiconductor layer 28 is not particularly limited, but is preferably 10 μm or more. The porous semiconductor layer 28 is preferably formed into a desired thick film by repeating an operation of baking at a temperature of, for example, 300 ° C. to 550 ° C. after forming a thin film of TiO 2 paste.
A dye is adsorbed on the surface of the fine particles constituting the porous semiconductor layer 28. The dye has absorption at a wavelength of 400 nm to 1000 nm. For example, ruthenium dye, phthalocyanine dye, osmium-based, iron-based and platinum-based metal complexes, cyanine dye, methine-based, mercurochrome-based, xanthene-based, porphyrin Organic pigments such as phthalocyanine, phthalocyanine, subphthalocyanine, azo, and coumarin. The adsorption method is not particularly limited. For example, a so-called impregnation method in which a conductive metal layer 30 having a through hole in which a porous semiconductor layer 28 is formed in a dye solution is immersed and the dye is chemically adsorbed on the fine particle surface may be used.

The shape of the conductive metal layer 30 is not limited as long as it has holes penetrating the front and back. For example, a through hole is formed in a metal mesh, mesh, nonwoven fabric, metal foil by drilling or etching. And sintered body of metal particles. The conductive metal layer 30 is preferably formed of a metal porous body having through holes, and the electrolyte passing therethrough uniformly penetrates into each part of the porous semiconductor layer 28.
The material of the conductive metal layer 30 is not particularly limited as long as it does not elute into the electrolyte 33. For example, 1 is selected from the group consisting of Ti, W, Ni, Pt, Ta, Nb, Zr and Au. It is preferable that it is a seed | species or 2 or more types of metal materials, these compounds, or the material coat | covered with these. Thereby, the electroconductive metal layer which has a through-hole with favorable corrosion resistance with respect to the iodine etc. in the electrolyte 33 can be obtained.
The thickness of the conductive metal layer 30 is not particularly limited, but is preferably 0.2 μm to 600 μm, for example. When the thickness of the conductive metal layer 30 is less than 0.2 μm, the electrical resistance may increase. On the other hand, if the thickness of the conductive metal layer 30 exceeds 600 μm, the flow resistance of the electrolyte 33 passing through the inside is too large, and the movement of the electrolyte 33 may be hindered.

The porous insulating layer 32 is made of, for example, glass paper, Teflon sheet (Teflon is a registered trademark), PP, which has corrosion resistance to the electrolyte 33 and has sufficient pores so as not to prevent diffusion of electrolyte ions. Sheets, PE sheets and the like are preferable.
The thickness of the porous insulating layer 32 is preferably 150 μm or less. If the thickness of the porous insulating layer 32 is 150 μm or more, the distance between the conductive metal layer 30 and the conductive substrate 26 becomes too large, causing a reduction in power generation efficiency.
By providing the porous insulating layer 32, a short circuit between the conductive metal layer 30 and the conductive substrate 26 can be prevented more reliably.

  The material of the sealing material 35 is not particularly limited, but a material having insulating properties, gas barrier properties, and the like is preferable. For example, an epoxy resin, an ultraviolet curable resin, an acrylic resin, a polyisobutylene resin, EVA (ethylene vinyl acetate), a silicone resin, and other various heat sealing resins can be used.

The connection electrode 10 and the dye-sensitized solar cell module 20 of the dye-sensitized solar cell module 20 according to the first example of the present embodiment described above are other solar cells such as a silicon solar cell and an organic thin-film ground cell battery. The two metal conductive layer portions 14 and 16 of the connection electrode 10 are electrically connected to the front electrode and the back electrode, respectively.
According to the connection electrode 10 and the dye-sensitized solar cell module 20 of the dye-sensitized solar cell module 20 according to the first example of the present embodiment, the power generation efficiency of the module can be improved.
That is, since the Z module has a structure in which adjacent dye-sensitized solar cells are connected by a paste-like conductive layer, for example, the electrical resistance of the conductive paste connecting adjacent dye-sensitized solar cells is a silver paste. Then, about 10 ⁻⁵ Ω · cm, and 10 ⁻² Ω · cm if a carbon-based paste is used (Asahi Chemical Laboratory Co., Ltd. polymer-type conductive paste). On the other hand, according to the dye-sensitized solar cell module 20, since the conductive metal layer is used for the connection between the adjacent dye-sensitized solar cells, the electric resistance of the conductive metal layer is 10 ⁻⁷ Ω.・ It is in the cm range (see Metal Data Book edited by the Japan Institute of Metals) Therefore, as the number of solar cell modules 20 connected in series increases, the internal electrical resistance of the solar cell module 20 can be suppressed to that extent.
There is a possibility that a part of the conductive material is used for the connection between the connection electrode 10 and the conductive metal layer (working electrode) 30 or the conductive metal layer (counter electrode) 26b. unacceptable.
In addition, since the connection electrode 10 is not likely to get wet like a conductive paste, the space with the TiO 2 layer can be suppressed as much as possible.
In addition, in the W-type module structure, the metal catalyst layer disposed on the electrolyte side of the conductive substrate in order to efficiently make light incident on the conductive substrate becomes very thin and the electrical resistance becomes high. The fill factor, which is a curve factor in the current-voltage characteristics at the time of photoelectric conversion, may decrease and the power generation efficiency may also decrease. On the other hand, according to the dye-sensitized solar cell module 20, the light receiving surface having the same structure is used. Are arranged in the same direction, so there is no such problem.

Next, the connection electrode and the dye-sensitized solar cell module of the dye-sensitized solar cell module according to the second example of the present embodiment will be described with reference to FIG.
The basic structure of the dye-sensitized solar cell module 20a according to the second example of the present embodiment whose schematic configuration is shown in FIG. 3 is the same as that of the dye-sensitized solar cell module 20 according to the first example of the present embodiment. It is. For this reason, the same reference numerals are assigned to the same components, and redundant description is omitted.

The dye-sensitized solar cell module 20a is a so-called TCO electrode type in which the conductive metal layer 30 is provided in contact with the transparent substrate 24, and in relation to this, the insulating layer 12a of the connection electrode 10a is a thick film. Further, the metal conductive layer portions 14a and 16a are disposed on both surfaces of the insulating layer 12a, and the insulating layer 36a of the extraction electrode 34a is made thick as in the connection electrode 10a, and the metal is formed on both surfaces of the insulating layer 36a. It differs from the solar cell module 20 in that the conductive layers 38a and 40a are provided.
The solar cell module 20a according to the second example of the present embodiment is an effect of the dye-sensitized solar cell module 20 according to the first example of the present embodiment in the TCO electrode type dye-sensitized solar cell module. It can be suitably obtained.

  Examples of the present invention will be described below. The present invention is not limited to this embodiment.

Example 1
Examples of the dye-sensitized solar cell module shown in FIG. 2 (however, the number of dye-sensitized solar cells is 3) will be described below.
A titania paste (trade name NanoxideD, manufactured by Solaronics) is applied to a 5 mm x 20 mm area of a porous Ti sheet (trade name Typorus, Osaka Titanium) with a thickness of 100 μm, dried, and then fired in air at 400 ° C. for 30 minutes. did. The operation of further printing and baking a titania paste on titania after firing was repeated three times in total to form a titania layer having a thickness of 12 μm on one side of the porous Ti sheet. The prepared porous Ti sheet substrate with titania layer was impregnated with a mixed solvent solution of N719 dye (manufactured by Solaronics) in acetonitrile and t-butyl alcohol for 70 hours to adsorb the dye on the titania surface. The substrate after adsorption was washed with a mixed solvent of acetonitrile and t-butyl alcohol. Three such laminates (dye-sensitized solar cells) were produced.
On the other hand, a titanium foil having a thickness of 20 μm was laminated on both sides of a thermoplastic resin sheet (SX1170-60PF, SOLARONIX) having a thickness of 60 μm and 20 mm × 100 mm with a laminator to prepare a three-layer body of titanium foil / resin / titanium foil. After the production, the three-layer body was cut into 20 mm × 5 mm, a part of the titanium foil portion of the three-layer body was removed by etching, and a hole with a diameter of 1 mm was drilled at a predetermined position with an NC drill in the center. A three-layer body (connection electrode) having through-holes in which both surfaces are conductive by filling the holes with Ag paste was produced.
The upper Ti layer of the three-layer body shown in FIG. 1 and the portion close to the peripheral edge on the back side of the porous Ti sheet with the titania layer adsorbed with the dye were spot-welded. Two Ti sheets welded in this way were produced. One of them was spot-welded in the same manner to the take-out electrode shown in FIG. 2 symmetrically with the side connected to the three-layer body of FIG.
On the other hand, a single sheet of a welded electrode and a dye-adsorbed porous Ti sheet with a titania layer was spot welded, and a counter electrode for the Ti sheet and a three-layered Ti sheet spot welded only on the three-layered body The lower Ti layer was thermocompression bonded with a conductive adhesive sheet.
Conductive bonding of the counter electrode to the Ti sheet where only the three-layer body was spot-welded first, and the lower Ti layer of the three-layer body of the Ti sheet where the three-layer body and the two electrodes of the extraction electrode are connected by spot welding The sheet was thermocompression bonded.
After sandwiching the glass paper between the Ti sheet and the counter electrode, each of which becomes a dye-sensitized solar cell, aligning the positions so that each Ti sheet and the counter electrode face each other, and fixing the three Ti sheets in three series, The sealing material was apply | coated to the outer periphery and the part used as the partition of each dye-sensitized solar cell.
A transparent substrate of polyethylene naphthalate (PEN) having a thickness of 125 μm and a porous Ti sheet substrate with a dye-adsorbed titania layer connected in series by a three-layer body having through-holes were bonded together with a sealing material. Then, electrolyte solution was inject | poured and the dye-sensitized solar cell module was obtained.
The IV curve of a dye-sensitized solar cell module composed of three battery cells arranged in series was measured. The photoelectric conversion efficiency was about 5.2%. Moreover, the open circuit voltage at this time was 2.1V. In addition, when the IV curve of one battery cell was measured separately, the photoelectric conversion efficiency was about 6.2%. Moreover, the open circuit voltage at this time was 0.70V.

(Example 2)
Examples of the dye-sensitized solar cell (however, the number of dye-sensitized solar cells is 3) shown in FIG. 3 will be described below.
A titania paste (trade name NanoxideD, manufactured by Solaronics) is applied to a 5 mm x 20 mm range of a 1.8 mm thick transparent glass substrate with a 400 nm thick ITO layer, dried, and then in air at 500 ° C for 30 minutes. Baked in. The operation of further printing and baking a titania paste on titania after firing was repeated a total of 3 times to form a titania layer having a thickness of 12 μm on the ITO layer of the transparent glass substrate. A transparent glass substrate with ITO with a prepared titania layer was impregnated with a mixed solvent solution of N719 dye (manufactured by Solaronics) in acetonitrile and t-butyl alcohol for 70 hours to adsorb the dye onto the titania surface. The substrate after adsorption was washed with a mixed solvent of acetonitrile and t-butyl alcohol.
After producing the same three-layered body as in Example 1, one point was conducted in the upper Ti layer of the three-layered body shown in FIG. Thermocompression bonding was performed with a conductive adhesive sheet. Two transparent glass substrates prepared in this way were prepared. One of the electrodes was thermocompression bonded to the ITO surface with a conductive adhesive sheet similarly to the side connected to the three-layer body of FIG. 1 in the same manner.
On the other hand, an ITO transparent glass base material adsorbing a dye connected to a take-out electrode is prepared, and the lower part of the three-layer body of the transparent glass base material to which only the three-layer body is bonded with the counter electrode for the transparent glass base material The Ti layer was thermocompression bonded with a conductive adhesive sheet.
A counter electrode of a 1.0 mm-thick glass substrate sputtered on one side with a 400-nm-thick Pt layer against a transparent glass substrate having only a three-layer body, and the two sides of the three-layer body and the extraction electrode are bonded. The lower Ti layer of the three-layered transparent glass substrate was thermocompression bonded with a conductive adhesive sheet.
The glass paper, which is a porous insulator with a thickness of 150 μm, is sandwiched between the transparent glass substrate and the counter electrode to be each dye-sensitized solar cell, and the transparent glass substrate with ITO and the counter electrode are aligned with each other, After fixing the three transparent glass substrates to be in series, a sealing material was applied to the outer periphery and the portions to be the partition walls of each dye-sensitized solar cell.
An electrolyte solution was injected to obtain a dye-sensitized solar cell module.
For the dye-sensitized solar cell module composed of three battery cells arranged in series, the IV curve was measured in the same manner as in Example 1. The photoelectric conversion efficiency was about 5.6%. Moreover, the open circuit voltage at this time was 2.16V. In addition, when the IV curve of one battery cell was measured separately, the photoelectric conversion efficiency was about 7.0%. Moreover, the open circuit voltage at this time was 0.71V.

10, 10a Connecting electrode 12, 12a, 36, 36a Insulating layer 14, 16 Metal conductive layer 18 Through hole 20, 20a Dye-sensitized solar cell module 22 Dye-sensitized solar cell 24 Transparent substrate 26 Conductive substrate 26a Substrate 26b Conductive Conductive metal layer 28 Porous half-layer body 30 Conductive metal layer 32 Porous insulating layer 33 Electrolyte 34, 34a Extraction electrode 35 Sealing material 38, 38a, 40, 40a Metal conductive layer

Claims (4)

At both ends of the insulating layer on both sides different from each other, metal conductive layer portions that are shorter than the insulating layer and overlap with one end portion in the vicinity of the center of the insulating layer in plan view are disposed, and the overlapping portions are electrically A connection electrode connected between the layers,
It has the same structure and is arranged between adjacent solar cells with the light receiving surface facing in the same direction, and one metal conductive layer portion is electrically connected to the cathode electrode of one solar cell and the other metal conductive A connection electrode of a solar cell module, wherein the layer portion is electrically connected to an anode electrode of a solar cell adjacent to the one solar cell.   The connection electrode of the solar cell module according to claim 1, wherein the overlapping portion is interlayer-connected by a through hole.   The solar cell module connection electrode according to claim 1, wherein the solar cell is a dye-sensitized solar cell.   It has a connection electrode of the solar cell module of any one of Claims 1-3, The solar cell module characterized by the above-mentioned.

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