WO2004036683A1 - 色素増感型太陽電池及び色素増感型太陽電池モジュール - Google Patents
色素増感型太陽電池及び色素増感型太陽電池モジュール Download PDFInfo
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- WO2004036683A1 WO2004036683A1 PCT/JP2003/012805 JP0312805W WO2004036683A1 WO 2004036683 A1 WO2004036683 A1 WO 2004036683A1 JP 0312805 W JP0312805 W JP 0312805W WO 2004036683 A1 WO2004036683 A1 WO 2004036683A1
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- dye
- solar cell
- sensitized solar
- layer
- photoelectric conversion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2068—Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells
- H01G9/2081—Serial interconnection of cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2027—Light-sensitive devices comprising an oxide semiconductor electrode
- H01G9/2031—Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2059—Light-sensitive devices comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/542—Dye sensitized solar cells
Definitions
- the present invention relates to a dye-sensitized solar cell and a dye-sensitized solar cell module.
- solar cells that can convert sunlight into electric power are attracting attention.
- some of the solar cells that have begun to be put into practical use include a solar cell using a crystalline silicon substrate and a thin-film silicon solar cell.
- the former has a problem that the production cost of the silicon substrate is high, and the latter requires the use of various semiconductor gases and complicated equipment, and the production cost is still high. Therefore, efforts are being made to reduce the cost per power generation output by increasing the efficiency of photoelectric conversion in any of the solar cells, but this has not been solved.
- Japanese Unexamined Patent Publication No. 5-504203 and Japanese Patent No. 2664194 show a wet type solar cell utilizing photoinduced electron transfer of a metal complex.
- a photoelectric conversion layer is formed using a photoelectric conversion material and an electrolyte material between electrodes formed on two glass substrates, respectively.
- the photoelectric conversion material has an absorption spectrum in the visible light region by adsorbing the photosensitizing dye.
- the photoelectric conversion layer when light is irradiated to the photoelectric conversion layer, electrons are generated, and the electrons move to the electrodes through an external electric circuit.
- the electrons transferred to the electrodes are carried by the ions in the electrolyte, and return to the photoelectric conversion layer via the opposing electrode. In this way, electric energy can be extracted.
- a technique of a low-cost manufacturing method is described in Japanese Patent Application Laid-Open No. 2000-91609, and the technique will be outlined.
- a transparent conductive film (electrode) is formed
- a prepared glass substrate is prepared.
- a platinum conductive film (electrode) and a titanium dioxide colloid power generation layer are formed on another rollable flexible substrate to form a laminate.
- the power generation layer is impregnated with the electrolyte solution. According to this technology, a single-unit organic solar cell can be obtained.
- International Publication WO 97/16838 discloses a dye-sensitized solar cell module in which a plurality of dye-sensitized solar cells are connected in series. Specifically, in each dye-sensitized solar cell, a titanium oxide layer, a porous insulating layer, and a counter electrode are sequentially laminated on a glass substrate on which a transparent conductive film (electrode) patterned in a strip shape is formed. It has a configuration. In addition, by arranging the conductive layer of one dye layer-sensitized solar cell so as to be in contact with the adjacent dye-sensitized solar cell and the counter electrode, the two solar cells are connected in series.
- the basic structure of the dye-sensitized solar cell described in Japanese Unexamined Patent Application Publication No. 5-504203 and Japanese Patent No. 2664194 is based on two glass substrates held at regular intervals.
- a dye-sensitive solar cell was created by injecting an electrolyte between the two. Therefore, even if a small area solar cell can be prototyped, it is difficult to apply it to a large area solar cell such as 1 m square.
- the area of one solar cell (unit cell) is increased, the generated current increases in proportion to the area.
- the lateral resistance component of the transparent conductive film used for the electrode portion is extremely increased, and the internal series electric resistance of the solar cell is increased.
- the fill factor (F F) in the current-voltage characteristics at the time of photoelectric conversion is reduced, and the photoelectric conversion efficiency is reduced.
- the amorphous silicon layer is first and second conductive layers.
- An integrated structure in which a first conductive layer of a rectangular unit cell used for a module of an amorphous silicon solar cell or the like having a configuration sandwiched between the first conductive layer and a second conductive layer of an adjacent unit cell can be considered.
- the conversion efficiency of an integrated solar cell module means the power generation efficiency per module area. Therefore, if the area of the gap is large, the light hitting the gap does not contribute to power generation, so that the module conversion efficiency is deteriorated even if the conversion efficiency of the unit cells constituting the module is high. In addition, the manufacturing cost per unit output will be worse.
- scribe is performed by laser or the like to perform integrated patterning, but it is difficult to apply these methods to dye-sensitized solar cells.
- the photoelectric conversion layer of the dye-sensitized solar cell is made of a porous material so as to adsorb more dye.
- a portion where such a porous body has a fine pattern formed by a laser or the like has a problem in that a fine pattern cannot be formed due to poor strength. Further, there is a problem that the manufacturing cost is increased by using the laser.
- a porous photoelectric conversion layer is formed using a screen printing method as in the solar cell described in WO 97/16838 shown in FIG.
- the pattern is formed by a laser, an air jet, or the like.
- 51 is a transparent substrate
- 52 is an intermediate layer
- 53 and 57 are gaps
- 54 and 56 are porous layers
- 55 is an intermediate porous layer
- 58 is electrically insulating.
- Top cover for liquid sealing, 59 and 60 mean terminals.
- the thickness of the porous photoelectric conversion layer of the dye-sensitized solar cell depends on the thickness of the porous photoelectric conversion layer. In order to adsorb a larger amount of dye on the surface of the constituent oxide semiconductor, generally, a length of about 10 m or more is required. It is difficult to uniformly form the second conductive layer on the porous photoelectric conversion layer manufactured by the above manufacturing method. For example, when the second conductive layer of a certain unit cell is brought into contact with the first conductive layer of an adjacent unit cell, the resistance increases due to the extremely thin second conductive layer on the side surface of the porous photoelectric conversion layer. Short circuit causes the efficiency of the dye-sensitized solar cell to decrease.
- the present inventors have conducted intensive studies in view of the above-described problems, and as a result, by using a shape suitable for increasing the efficiency of the dye-sensitized solar cell, it becomes possible to manufacture the cell more easily than the conventional technology, Furthermore, they have found that a photocurrent density is increased, and that a dye-sensitized solar cell having high conversion efficiency and a dye-sensitized solar cell module using the same can be obtained, and the present invention has been completed.
- a substrate comprising a first support and a first conductive layer, a porous photoelectric conversion layer having a dye adsorbed thereon, a carrier transport layer, a second conductive layer and a second conductive layer are provided on the first conductive layer.
- a dye-sensitized solar cell comprising a laminate in which a support is sequentially laminated, wherein the porous photoelectric conversion layer has a facing surface length different from a contact surface length with a substrate.
- a dye-sensitized solar cell module in which a plurality of the dye-sensitized solar cells are arranged, wherein the first conductive layer of the dye-sensitized solar cell and another dye adjacent thereto are provided.
- FIG. 1 is a schematic cross-sectional view of an integrated dye-sensitized solar cell module of the present invention.
- FIGS. 2A and 2B are schematic cross-sectional views of the porous photoelectric conversion layer of the dye-sensitized solar cell of the present invention.
- FIG. 3 is a diagram showing the relationship between the dimensionless number K and the short-circuit current value of the dye-sensitive solar cell of the present invention.
- FIG. 4 is a cross-sectional view of a two-series dye-sensitized solar cell module of the present invention.
- FIG. 5 is a schematic cross-sectional view of a conventional dye-sensitized solar cell.
- a dye-sensitized solar cell (hereinafter, also simply referred to as a solar cell) of the present invention includes a substrate comprising a first support and a first conductive layer, and a porous photoelectric conversion in which a dye is adsorbed on the first conductive layer.
- the present invention is characterized in that the porous photoelectric conversion layer has a facing surface length different from the contact surface length with the substrate.
- the length of the contact surface may be shorter or longer than the length of the opposite surface as long as it is different from the length of the opposite surface.
- FIG. 2A shows a cross-sectional view in which a porous photoelectric conversion layer is formed on a substrate.
- 21 is the length of the facing surface
- 22 is the length of the contact surface
- 23 is the film thickness (Y).
- the shortest length from the intersection of the line extending perpendicular to the board surface from the end of the opposing surface to the contact surface and the contact surface end is 24 or 25, and the difference between the facing surface length and the contact surface length is Means the sum of the lengths of 24 and 25.
- the length of 24 or 25, which is the standard for calculating the shortest length from the intersection of the line extending perpendicular to the substrate surface from the end of the opposing surface to the contact surface and the end of the contact surface, is that the film thickness of 24 or 25 is The distance from the point where the thickness is smaller than 23 to the end of the porous photoelectric conversion layer (Fig. 2 (a) 24, 25). If it is difficult to determine the distance by the above method, for example, when the facing surface has an inclination, the distance may be determined by the following method.
- the porous photoelectric conversion layer is stretched in parallel with the substrate, based on the central portion of the contact length 22 of the substrate and the film thickness 23 within the range corresponding to 60% of the contact length, based on the length of the film 23.
- the shortest length from the intersection of the line extending perpendicularly to the substrate surface from the end of the opposing surface and the contact surface to the end of the contact surface is calculated by using a point smaller than the film thickness based on the flat line.
- the surface of the porous photoelectric conversion layer manufactured by screen printing or the like may have irregularities depending on the manufacturing conditions. In this case, the average value of the film thickness at 21 in FIG.
- the shape of the porous photoelectric conversion layer shown in FIGS. 2A and 2B can be measured by using a stylus-type step meter.
- the porous photoelectric conversion layer produced by screen printing or the like may have a shape as shown in FIG. 2 (b).
- the thickest part is used as a reference.
- the shortest length (24 or 25) from the intersection of the line extending perpendicular to the substrate surface from the end of the opposing surface to the end of the contact surface is preferably 50 m or more. If the length is less than 50 m, the effect of improving the conversion efficiency is poor, which is not preferable. More preferably, the difference between the contact surface length and the opposing surface length is 100 to 800 m.
- X is the shortest length from the intersection of the line extending perpendicularly to the substrate surface from the end of the facing surface and the contact surface to the end of the contact surface
- ⁇ is the film of the porous photoelectric conversion layer.
- the dimensionless number ⁇ represented by is preferably not more than 0.5. More preferred Is less than 0.05.
- the first support is a member capable of functionally supporting the porous photoelectric conversion layer from production to use of the product.
- the first support is preferably a support having a light transmitting property and made of a material having high heat resistance.
- the first support may be any material as long as it substantially transmits at least light having a wavelength having an effective sensitivity to the sensitizing dye described below, and it is not necessary that the first support has transparency to all light. Not required.
- Examples of the material of the first support include glasses such as soda glass, fused silica glass, and crystallite glass, and heat-resistant resin plates such as flexible films.
- the support preferably has a thickness of about 0.2 to 5 mm and has a heat resistance of 250 ° C. or more.
- examples of such a support include glasses and flexible films.
- films are, for example, long-term weather-resistant sheets such as polyester, polyacryl, polyimide, polytetrafluoroethane (trade name: Teflon), polyethylene, polypropylene, PET, etc. And films.
- Teflon polytetrafluoroethane
- the film is heated to a temperature close to 200 ° C. during deposition of the conductive layer, it is preferable that the film is made of Teflon having heat resistance at this temperature.
- the support can be used when attaching the completed dye-sensitized solar cell to another structure.
- the peripheral portion of the glass can be easily attached to another support using metal processing parts and screws.
- the second support is not particularly limited. Specifically, a support similar to the first support can be used, and further, if the firing step is not performed after the second support is installed, the second support does not have heat resistance. You may.
- the first support is used as the light receiving surface of the solar cell, there is no problem even if the second support is opaque. In this case, in order to use the incident light effectively, it is desirable to use a material such as a metal that can reflect the incident light. New In order to reduce the weight of the solar cell, it is preferable to use a film, and from the viewpoint of enhancing the moisture resistance, a laminated film of PET and aluminum is preferable.
- the porous photoelectric conversion layer can be tightly sealed with the opposing first or second support by a lamination method or the like, so that unnecessary voids are formed. Can be reduced.
- the first conductive layer and the second conductive layer are configured to sandwich the porous photoelectric conversion layer and the carrier transport layer when the first support and the second support are overlapped.
- the first conductive layer can be formed on the first support, and the second conductive layer can be formed on the second support or a porous insulating layer described later.
- Materials include transparent conductive metals such as ITO (indium-tin composite oxide), fluorine-doped tin oxide, boron, gallium or aluminum-doped zinc oxide, and niobium-doped titanium oxide. Oxides, gold, silver, aluminum, indium, platinum, carbon (carbon black, graphite, glass carbon, amorphous carbon, hard carbon, soft carbon, carbon steel, carbon nanotube, Hula
- At least one of the first conductive layer and the second conductive layer is preferably made of a transparent material so that light can be transmitted.
- a transparent material for example, a material obtained by forming a thin film of tin oxide or an opaque material (for example, a metal material such as aluminum) is used.
- any material may be used as long as it substantially transmits at least light having a wavelength having an effective sensitivity to the sensitizing dye described below, and it is not necessary to have transparency to all light.
- the conductive layer on the side where light transmission is not required does not require thinning of the opaque material. For this reason, it is possible to produce platinum, various kinds of carbon, and the like with an arbitrary film thickness from the viewpoint of conductivity, and a mixture of platinum and the like in the above-mentioned carbon fiber can also be used.
- the porous photoelectric conversion layer is composed of a semiconductor and has a form such as a particle, a film, or the like. Although various forms can be used, a film form is preferable.
- a known semiconductor such as titanium oxide, zinc oxide, tungsten oxide, barium titanate, strontium titanate, and cadmium sulfide may be used alone or in combination of two or more. it can. Among them, titanium oxide or zinc oxide is preferable in terms of conversion efficiency, stability, and safety.
- a method for forming the film-like porous photoelectric conversion layer on the substrate various known methods can be used. Specific examples include a method of applying and baking a suspension containing semiconductor particles on a substrate, such as a screen printing method and an ink jet method. Of these, the screen printing method using a suspension is preferred from the viewpoint of thickening and manufacturing cost.
- the thickness of the porous photoelectric conversion layer at this time is not particularly limited, but is preferably about 0.5 to 4 ⁇ m from the viewpoints of transparency, conversion efficiency, and the like. Further, in order to improve the conversion efficiency, it is necessary to adsorb a dye described later in the porous photoelectric conversion layer more.
- film-like porous photoelectric conversion layer preferably has a size that the specific surface area, 1 0 m 2 / g ⁇ 4 0 O m 2 / g is preferably about.
- the specific surface area is a value measured by a BET adsorption method.
- an appropriate average particle size among commercially available ones for example, 1 ⁇ ! Single or compound semiconductor particles having an average particle size of about 500 nm to about 500 nm.
- the average particle size is a value measured by SEM observation.
- Solvents used for suspending the semiconductor particles include glyme solvents such as ethylene glycol monomethyl ether, alcohol solvents such as isopropyl alcohol, mixed solvents such as isopropyl alcohol / toluene, and water. Is mentioned.
- Drying and baking of the porous photoelectric conversion layer described above are performed by appropriately adjusting conditions such as temperature, time, and atmosphere depending on the type of substrate and semiconductor particles used. Such conditions For example, about 10 seconds to about 12 hours in the range of about 50 to 800 ° C. in the atmosphere or in an inert gas atmosphere. The drying and baking can be performed once at a single temperature or two or more times at different temperatures.
- Examples of the dye adsorbed on the porous photoelectric conversion layer and functioning as a photosensitizer include those having absorption in various visible light regions and / or infrared light regions. Further, in order for the dye to be strongly adsorbed on the porous photoelectric conversion layer, a carboxylic acid group, a carboxylic acid anhydride group, an alkoxy group, a hydroxyl group, a hydroxyalkyl group, a sulfonate group, and an ester group are required in the dye molecule. Those having an interlock group such as a mercapto group and a phosphonyl group are preferred. Among these, a carboxylic acid group and a carboxylic acid anhydride group are more preferred. Note that the in-lock group provides an electrical connection that facilitates electron transfer between the dye in the excited state and the conduction band of the porous photoelectric conversion layer.
- Examples of the dyes containing these interlocking groups include ruthenium dyes, azo dyes, quinone dyes, quinonimine dyes, quinacridone dyes, squarylium dyes, cyanine dyes, merocyanine dyes, and trifenyl.
- Examples include methane dyes, xanthene dyes, porphyrin dyes, phthalocyanine dyes, beryllene dyes, indigo dyes, and naphthocyanine dyes.
- Examples of a method for producing a porous photoelectric conversion layer on which a dye is adsorbed include a method in which a porous photoelectric conversion layer formed on a conductive support is immersed in a solution in which a dye is dissolved (a solution for dye adsorption).
- the solvent for dissolving the dye may be any solvent that dissolves the dye. Specific examples thereof include alcohols such as ethanol, ketones such as acetone, ethers such as dimethyl ether, and tetrahydrofuran. Nitrogen compounds such as acetonitrile, halogenated aliphatic hydrocarbons such as methylform, aliphatic hydrocarbons such as hexane, aromatic hydrocarbons such as benzene, esters such as ethyl acetate, Water and the like. These solvents can be used as a mixture of two or more. The concentration of the dye in the solution can be appropriately adjusted depending on the type of the dye and the solvent to be used, but it is preferable that the concentration be as high as possible to improve the adsorption function.
- it may be at 5 X 1 0- 4 mol / Ridzutoru more.
- the porous photoelectric conversion layer preferably has an inclined surface at an end of a peripheral region of the layer.
- the carrier transport layer filled between the porous photoelectric conversion layer and the second conductive layer is composed of a conductive material capable of transporting electrons, holes and ions, and a solvent.
- a conductive material capable of transporting electrons, holes and ions
- a solvent for example, hole transport materials such as polysorbazol, electron transport materials such as tetranitrofluorenone, conductive polymers such as polyols, ion conductors such as liquid electrolytes and polymer electrolytes, Examples include p-type semiconductors such as copper iodide and copper thiocyanate.
- an ion conductor is preferable, and a liquid electrolyte containing a redox electrolyte is particularly preferable.
- Such an oxidation-reduction electrolyte is not particularly limited as long as it can be generally used in batteries and solar cells.
- a combination of a metal bromide and bromine is preferred, and among these, a combination of LiI and iodine is preferred.
- an imidazole salt such as dimethylpropylimidazole iodide may be mixed.
- the solvent examples include carbonate compounds such as propylene carbonate, nitrile compounds such as acetonitrile, alcohols such as ethanol, and water, aprotic polar substances, and the like. Among them, a carboxylate compound and a nitrile compound are preferable. These solvents can be used as a mixture of two or more kinds.
- the concentration of the conductive material is preferably in the range of 0.1 to 1.5 mol / liter, more preferably 0.01 to 0.8 mol / liter.
- the carrier transport layer is formed by forming a porous insulating layer on the porous photoelectric conversion layer, May be used as a solid carrier transport layer.
- a second conductive layer can be formed thereon.
- the second conductive layer is formed on the second support as described above, but if the distance between adjacent unit cells is reduced, the second support on which the second conductive layer is formed is overlapped. To do this, precision is needed.
- an integrated structure can be formed with high accuracy by forming a porous insulating layer on the porous photoelectric conversion layer and forming a carrier transport layer therein.
- the material of the porous insulating layer is an insulating material, and examples thereof include zirconium oxide, silicon oxide, aluminum oxide, and boron oxide.
- the production method there is no particular problem in the production method as long as a shape that does not affect the carrier transport can be produced.
- a method similar to the method of forming the porous photoelectric conversion layer can be used.
- a screen printing method is preferable as a method for applying a suspension containing particles made of the above-mentioned insulating material.
- the produced porous insulating layer has a high reflectance and a high haze.
- the dye-sensitized solar cell is connected in series by contacting the first conductive layer of the dye-sensitized solar cell with the second conductive layer of another dye-sensitized solar cell adjacent thereto.
- a dye-sensitized solar cell module characterized by being connected and integrated is also provided.
- the ends of the porous photoelectric conversion layers of adjacent dye-sensitized solar cells do not have to be parallel.
- Fig. 1 shows an example of a schematic cross-sectional view of the connection part of an integrated dye-sensitized solar cell (dye-sensitized solar cell module).
- 1 is a first support
- 2 is a first conductive layer (1 and 2 are simply referred to as a substrate)
- 3 is a porous photoelectric conversion layer
- 4 is a porous insulating layer on which a carrier transport layer is formed
- 5 is a second conductive layer
- 6 is an insulating layer
- 7 is a second support.
- first conductive layer 2 On one surface of the first support 1 made of glass having a thickness of about 3 mm, Sn ⁇ ⁇ 2 having a thickness of about 900 nm is formed to form a first conductive layer 2.
- the glass and S n 0 2 are those having 4 5 0 ° C or more heat-resistant.
- the pattern of the first conductive layer 2 is preferably performed such that the first conductive layer 2 partially contacts the second conductive layer 5 described later, and a plurality of unit cells are connected in series. Removing work of S n 0 2 refers irradiation Les one The foremost S n 0 2, performed by evaporation.
- the solvent to T i 0 2 powder is a metal oxide, mixed with a binder to form a slurry or paste. This is screen-printed on a predetermined position of the first conductive layer 2 using a screen plate on which a pattern is separately formed, to produce a porous photoelectric conversion layer 3. After that, the porous photoelectric conversion layer 3 is leveled and dried in an open at 80 ° C.
- a solvent or the like is mixed with the aluminum oxide powder to form a slurry or paste, and a porous insulating layer 4 is prepared in the same manner as the porous photoelectric conversion layer 3. Further, the second conductive layer 5 is similarly manufactured using carbon powder. Then, each layer is sintered by firing in air at 450 ° C. It is preferable to use a paste having such a viscosity that the layer structure can be maintained even when the paste is repeatedly applied.
- the second support 7 may be provided before the polymerization, and the polymerization may be performed.
- the film thickness Y was 15 zm, and the film was extended vertically from the end of the facing surface to the substrate surface.
- the minimum length X from the intersection of the contact line and the contact surface to the edge of the contact surface was 200 m, and the dimensionless dimension K was 0.0 ⁇ 5.
- the porous photoelectric conversion layer 3 is formed such that the film thickness Y is 15 // ⁇ 1 and the contact surface end is formed from the intersection of the line extending perpendicularly to the substrate surface from the end of the opposite surface and the contact surface.
- a dye-sensitized solar cell of 1 cm ⁇ 1 cm (based on the length of the opposing surface) having a minimum length X of 200 ⁇ m and a dimensionless number K of 0.075 was fabricated.
- the materials used and the manufacturing method used for manufacturing the solar cell are as follows.
- As the substrate a 15 mm ⁇ 15 mm glass substrate (first support 1) with fluorine doping Sn 0 2 (first conductive layer 2) manufactured by Nippon Sheet Glass Co., Ltd. was used.
- the porous photoelectric conversion layer 3 made of titanium oxide is made of a commercially available titanium oxide paste (manufactured by Solarix, Inc., trade name: D / SP) and a screen printing machine (manufactured by Neuron Seimitsu Co., Ltd., LS-150). The fabrication was carried out.
- an aluminum oxide paste was produced as follows. First, aluminum oxide particles (500 nm in diameter) were prepared, and a surfactant (trade name: Triton-X, manufactured by Kishida Chemical Co., Ltd.), zirconiaaviz (3 mm in diameter), and diethylene glycol monomethyl ether
- the aluminum oxide paste was prepared by mixing it with Teru and dispersing it with Paintshie. The weight mixing ratio was adjusted to an aluminum oxide concentration of 30% and a Triton-X concentration of 1%. The dispersing conditions were such that 100 g of zirconiaaviz was added to 40 ml of the solution, and the dispersing time by paint shear was 2 hours.
- carbon was used as a material of the second conductive layer 5.
- a carbon paste was produced as follows. First, carbon particles are prepared, and a PVDF polymer is mixed as a binder and n-methyl-2-pyrrolidone is mixed as a solvent.
- a polymer electrolyte layer was used as the carrier transport layer.
- reaction vessel 18 parts by weight of tolylene diisocyanate and 0.05 part by weight of dibutyltin dilaurate as a catalyst are added to 100 parts by weight of polytetramethylene glycol (manufactured by Mitsubishi Kasei Kogyo Co., Ltd., trade name: PT MG 2000). The reaction was carried out at 80 ° C. to produce Compound A having a molecular weight of 2350.
- polytetramethylene glycol manufactured by Mitsubishi Kasei Kogyo Co., Ltd., trade name: PT MG 2000.
- the second support a laminated film of PET-aluminum-PET was used.
- the operating characteristics of the obtained dye-sensitized solar cell under AMI.5 simulated sunlight irradiation were examined.As a result, the short-circuit current density was 13.8 mA / cm 2 , the open-circuit voltage was 0.65 V, and the FF was 0.64. The conversion efficiency was 5.74%.
- the film thickness and length ratio are based on the viscosity coefficient of titanium oxide, thixotropic property, yield stress, screen printing conditions (screen mesh, screen emulsion thickness, gap (distance between screen plate and substrate), squeegee printing pressure). , Printing speed, printing temperature / humidity, leveling temperature, drying temperature). By combining these conditions, we succeeded in producing a total of 13 types of film thickness / length ratios (film thickness of 15 zm).
- viscosity coefficient 100,000 to 15 million cPs
- screen mesh 60 to 2
- the dimensionless number K becomes 0.01
- the shortest length X from the intersection of the line extending perpendicular to the substrate surface to the contact surface and the contact surface end is 150 ⁇ m. Met.
- the viscosity coefficient is 1.5 million cPs
- the screen mesh is 100 mesh
- the screen emulsion thickness is 20 mm
- the squeegee printing pressure is 3.2 kg
- the printing speed is 10 mm / s
- the dimensionless number K becomes 0.075
- the substrate surface starts from the end of the facing surface.
- the shortest length X from the intersection of the line extending perpendicular to the contact surface to the end of the contact surface was 200 Xm.
- FIG. 3 shows the results.
- the bottom (24 or 25) of the triangle of the porous photoelectric conversion layer 3 cross section becomes longer, and the light receiving surface of the solar cell becomes wider.
- the number of supplied photons increases.
- the contact length 22 between the porous photoelectric conversion layer 3 and the substrate becomes long. That is, even if the incident light increases due to the increase in the light receiving area, the photocurrent density of the entire dye-sensitized solar cell with respect to the light receiving area is considered to deteriorate.
- the short-circuit current density increased while the dimensionless number K exhibited a behavior having an inflection point at or near 0.15. This is because at the dimensionless number K, the length of the inclined portion of the porous photoelectric conversion layer with respect to the substrate becomes longer, and the contact area with the porous insulating layer increases. As a result, reflection and scattering of light at the porous insulating layer are increased, and light that cannot be effectively used by conventional transmission among light amounts from the light receiving surface to the porous photoelectric conversion layer can be reused.
- the reason for this is that the volume of the photoelectric conversion layer is reduced.
- a dye-sensitized solar cell performs photoelectric conversion in a portion where the dye is adsorbed on one particle of titanium oxide, which is multi-layered and multiplexed. The current value is earned by becoming.
- the dye used Although it depends on the absorption wavelength range, the light cannot be completely absorbed in each wavelength range, but some light is transmitted and the incident light cannot be used completely.
- a cell having a dimensionless number of 1, that is, a rectangular cross-section of the porous photoelectric conversion layer 3 was prepared, and a short-circuit current density of 12.9 mA / cm, an open-circuit voltage value of 0.65 V, a FF of 0.65, and a conversion efficiency of 5. It was 32%.
- FIG. 4 shows a cross-sectional view of two series dye-sensitized solar cell modules.
- 41 is a first support
- 42 is a first conductive layer
- 41 and 42 are simply referred to as a substrate
- 43 is a porous photoelectric conversion layer
- 44 is a porous insulating layer on which a carrier transport layer is formed
- 45 Is a second conductive layer
- 46 is an insulating layer
- 47 is a second support
- 48 is an extraction electrode.
- glass substrate was prepared with Nippon Sheet Glass S n 0 2 (first conductive layer 42) of the area 15 mmx 30 mm, the scribed Sn0 2 portion of the middle of the width 30mm in width of about 35 0 ⁇ M
- the electrode portion taken out from the second conductive layer also removed the first conductive layer. It was prepared cell in the above step to that of S n0 2 region was prepared first conductive layer 41 and the second series of dye-sensitized solar cell module Ichiru contacting the second conductive layer 45 adjacent.
- the short-circuit current density was 13.10 mA / cm 2
- the open-circuit voltage value was 1.25 V
- the FF was 0.59
- the conversion efficiency was 4.83%.
- the dimensionless number was set to 1, that is, two series of dye-sensitized solar cell modules of cells in which the edges of the porous photoelectric conversion layer 3 were removed were short-circuit current density 12.3 mA / cm The value is 1.27 V, FF is 0.49, and the conversion efficiency is 3.83%.
- the shape of the present invention the formation of the second conductive layer 5 is facilitated, and the resistance is increased. It was confirmed that the components could be reduced.
- the conversion efficiency of a solar cell module is calculated based on the light receiving surface. Therefore, if the area other than the element is large in the light receiving surface, the conversion efficiency of the module is reduced. Therefore, also in the present invention, it is preferable that the distance between adjacent porous photoelectric conversion layers is as small as possible.
- the porous photoelectric conversion layer is manufactured by screen printing or the like, as described above, depending on the state of the paste to be used and the manufacturing conditions, the porous photoelectric conversion layer comes into contact with a line extending perpendicularly to the substrate surface from the end of the facing surface. Adjustment of the shortest length X from the intersection with the surface to the end of the contact surface is possible.
- the area is calculated using the effective area (the light receiving area of the porous photoelectric conversion layer) in order to clarify the performance change due to the shape of the porous photoelectric conversion layer.
- the series connection part has the structure shown in Fig. 1.
- the porous photoelectric conversion layer 3 after firing was 1 cm X 9 cm in shape, the film thickness was 15 m, and the line extending perpendicularly to the substrate surface from the end of the facing surface was contacted with the contact surface by a screen printer.
- the minimum length X from the intersection to the contact surface end was 350 / m, and the dimensionless number K was 0.06.
- the patterning interval of the screen plate used for this printing is lmm.
- an aluminum oxide paste for forming a porous insulating layer
- a carbon paste for forming a second conductive layer
- the layers were sintered simultaneously at about 450 ° C. for 1.5 hours in an oxygen atmosphere, thereby simultaneously sintering each layer to form a porous photoelectric conversion layer 3, a porous insulating layer, and a second conductive layer.
- a urethane resin was formed as the insulating layer 6. Further, a polymer electrolyte is formed in the porous photoelectric conversion layer 3 and the porous insulating layer 4, and the second support 7 having a laminated structure of PET-aluminum-PET is provided, whereby the integrated dye is obtained.
- the dye-sensitized solar cell module manufactured in the above process, in which the sensitized solar cell module was manufactured, is one in which ten 1 cm ⁇ 9 cm unit cells are connected in series.
- the short-circuit current density was 12.7 ImA / cm 2
- the open-circuit voltage was 6.49 V
- FF 0.54 the module conversion efficiency was 4.45%.
- the obtained dye-sensitized solar cell module had a short-circuit current density of 10.37 mA / cm 2 , an open-circuit voltage of 6.49 V, a FF of 0.50, and a module conversion efficiency of 3.37%.
- the dimensionless number K is 0.15
- the shortest length X from the intersection of the line extending perpendicularly to the substrate surface from the end of the opposing surface to the end of the contact surface is 100
- a dye-sensitized solar cell module having a porous photoelectric conversion layer 3 of jum was prepared.
- the obtained dye-sensitized solar cell module had a short-circuit current density of 1. 1.
- the dimensionless number K is 0.02
- the minimum length X from the intersection of the line extending perpendicularly to the substrate surface from the end of the opposing surface to the end of the contact surface is 330 m
- a dye-sensitive solar cell module having a porous photoelectric conversion layer 3 having a film thickness of 10 ⁇ m was produced.
- the performance of the obtained dye-sensitized solar cell module was as shown in Table 1.
- the dimensionless number K is 0.07
- the shortest length X from the intersection of the line extending perpendicular to the substrate surface from the end of the opposing surface to the end of the contact surface is 150.
- a dye-sensitized solar cell module having a porous photoelectric conversion layer 3 having a thickness of 10 m and a thickness of 10 m was produced.
- the performance of the obtained dye-sensitized solar cell module was as shown in Table 1.
- the dimensionless number K is 0.04, and the shortest length X from the intersection of the line extending perpendicularly to the substrate surface from the end of the facing surface to the contact surface to the end of the contact surface is 500 m.
- a dye-sensitized solar cell module having a porous photoelectric conversion layer 3 having a film thickness of 20 / m was produced. The performance of the obtained dye-sensitized solar cell module was as shown in Table 1.
- the dimensionless number K is 0.10, and extends perpendicularly to the substrate surface from the end of the facing surface.
- a dye-sensitized solar cell module having a porous photoelectric conversion layer 3 with a minimum length X from the intersection of the stripped line and the contact surface to the end of the contact surface of 200 m and a film thickness of 20 m was manufactured. .
- the performance of the obtained dye-sensitive solar cell module was as shown in Table 1.
- the conversion efficiency is improved by having the configuration of the present invention. Furthermore, since the conversion efficiency of the unit cell dye-sensitized solar cell has also been improved, it has been found that the structure is effective for increasing the size to about lmx lm. According to the present invention, a dye-sensitized solar cell with improved conversion efficiency, a simple manufacturing process, low cost, and high conversion efficiency, and a dye-sensitized solar cell module using the same, are provided. Can be produced.
Abstract
Description
Claims
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AU2003271105A AU2003271105A1 (en) | 2002-10-15 | 2003-10-06 | Sensitized dye solar cell and sensitized dye solar cell module |
JP2004544922A JP4278615B2 (ja) | 2002-10-15 | 2003-10-06 | 色素増感型太陽電池及び色素増感型太陽電池モジュール |
US11/099,564 US7851699B2 (en) | 2002-10-15 | 2005-04-06 | Dye-sensitized solar cell and dye-sensitized solar cell module |
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JP (1) | JP4278615B2 (ja) |
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WO (1) | WO2004036683A1 (ja) |
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JP4278615B2 (ja) | 2009-06-17 |
AU2003271105A1 (en) | 2004-05-04 |
US20050257826A1 (en) | 2005-11-24 |
US7851699B2 (en) | 2010-12-14 |
JPWO2004036683A1 (ja) | 2006-02-16 |
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