WO2023190084A1 - TOPCon型太陽電池電極用導電性アルミニウムペースト組成物及びその焼成物である裏面電極が積層されているTOPCon型太陽電池 - Google Patents
TOPCon型太陽電池電極用導電性アルミニウムペースト組成物及びその焼成物である裏面電極が積層されているTOPCon型太陽電池 Download PDFInfo
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- WO2023190084A1 WO2023190084A1 PCT/JP2023/011647 JP2023011647W WO2023190084A1 WO 2023190084 A1 WO2023190084 A1 WO 2023190084A1 JP 2023011647 W JP2023011647 W JP 2023011647W WO 2023190084 A1 WO2023190084 A1 WO 2023190084A1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C03C8/16—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions with vehicle or suspending agents, e.g. slip
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F10/00—Individual photovoltaic cells, e.g. solar cells
- H10F10/10—Individual photovoltaic cells, e.g. solar cells having potential barriers
- H10F10/14—Photovoltaic cells having only PN homojunction potential barriers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F77/00—Constructional details of devices covered by this subclass
- H10F77/20—Electrodes
Definitions
- the present invention relates to a TOPCon type solar cell in which a conductive aluminum paste composition for a TOPCon type solar cell electrode and a back electrode which is a fired product thereof are laminated.
- a solar cell element employing a TOPCon (Tunnel Oxide Passivated Contact) structure has been devised as one of the technologies for improving the efficiency, reliability, etc. of solar cells.
- TOPCon Tel Oxide Passivated Contact
- a solar cell employing this structure will be referred to as a "TOPCon type solar cell.”
- the TOPCon structure in order to reduce recombination loss between the n-type silicon substrate serving as the base substrate and the back electrode made of silver, aluminum, etc., a few nanometers of silicon oxide is placed between the base substrate and the back electrode. A thin tunnel oxide layer, a semiconductor layer (microcrystalline n + silicon layer) doped with high concentrations of phosphorus, boron, etc., and a passivation film made of Si 3 N 4 , Al 2 O 3, etc. are formed. There is.
- This structure is characterized in that carrier loss at the interface between the n-type silicon substrate and the microcrystalline n + silicon layer is suppressed by the generation of a tunnel effect by the oxide layer.
- Patent Document 1 discusses the use of a conductive aluminum paste composition containing aluminum-silicon alloy particles, an organic vehicle, and glass powder.
- a back electrode containing aluminum powder, lead glass powder, and an organic vehicle for p-type silicon substrates is used as an aluminum paste with fire-through properties that allows the back electrode to be formed without forming an LCO.
- Patent Document 2 a paste for back electrodes containing aluminum powder, lead-free glass powder, and an organic vehicle is known (Patent Document 3).
- the paste when forming the back electrode of a TOPCon type solar cell, the paste itself has the fire-through property of a passivation film, so there is no need to form an LCO, and furthermore, there is no need to form an alloy layer with an n-type silicon substrate. It is an object of the present invention to provide a conductive aluminum paste composition that can obtain good ohmic contact. Another object of the present invention is to provide a TOPCon type solar cell in which a back electrode, which is a fired product thereof, is laminated.
- the present inventors have discovered that the above object can be achieved by using a conductive aluminum paste composition containing a specific composition of aluminum-silicon alloy powder and glass powder. , we have completed the present invention.
- a conductive aluminum paste composition comprising an aluminum-silicon alloy powder, an organic vehicle, and a glass powder, the composition comprising: (1) The aluminum-silicon alloy powder has a silicon concentration of 30% by mass or more and 40% by mass or less, (2) the glass powder contains a first glass powder and a second glass powder, The first glass powder contains PbO from 45% to 71%, B 2 O 3 from 5% to 35%, and SiO 2 from 0.1% to 25.0%, expressed as oxide mol%.
- the second glass powder contains B 2 O 3 in an amount of 35.0% to 55.0%, SiO 2 in an amount of 5.0% to 10.0%, and BaO 1.0% in terms of oxide mol%. 20.0% or more, CaO 5.0% or more and 25.0% or less, K 2 O 3.0% or more and 30.0% or less, and does not substantially contain PbO.
- a conductive aluminum paste composition for a TOPCon type solar cell electrode characterized in that: 2. 2.
- the conductive aluminum paste composition according to item 1 wherein the first glass powder contains a total of 1% or more and 10% or less of Al 2 O 3 and/or ZnO expressed as oxide mole %. 3.
- the conductive aluminum paste composition according to item 1 or 2 wherein the second glass powder contains 1.0% or more and 10.0% or less of SrO expressed as oxide mole %. 4.
- a TOPCon type solar cell in which a back electrode which is a fired product of the conductive aluminum paste composition according to any one of items 1 to 3 above is laminated on a silicon semiconductor substrate.
- the conductive aluminum paste composition of the present invention contains aluminum-silicon alloy powder and glass powder having a specific composition, so that the paste itself has fire-through properties of the passivation film in forming the back electrode of a TOPCon solar cell. Therefore, it is not necessary to form an LCO, and furthermore, good ohmic contact can be obtained without forming an alloy layer with the n-type silicon substrate. Note that not forming an alloy layer with the n-type silicon substrate means that there is no erosion of the microcrystalline n + silicon layer, and being able to obtain good ohmic contact means that the contact resistance is 10 m ⁇ as an indicator of high conversion efficiency. cm 2 or less.
- FIG. 1 is a schematic cross-sectional view showing an example of the structure of a TOPCon type solar cell.
- FIG. 3 is a diagram showing the printing width when a conductive aluminum paste composition is screen printed on the surface of a microcrystalline n + silicon layer in Examples and Comparative Examples. Specifically, it shows that the print width is 1 mm, the length is 10 mm, and the print intervals are set to be parallel to each other under the conditions of 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, and 2.0 mm. There is.
- the conductive aluminum paste composition for a TOPCon type solar cell electrode of the present invention and a TOPCon type solar cell using the same will be explained in detail.
- the numerical range indicated by “ ⁇ ” indicates “more than or equal to, less than or equal to” unless otherwise specified. That is, “A to B” indicates a range of A or more and B or less.
- the conductive aluminum paste composition of the present invention is for use in a TOPCon type solar cell electrode, and the conductive aluminum paste composition contains an aluminum-silicon alloy powder, an organic vehicle, and a glass powder. As long as the aluminum-silicon alloy powder and the glass powder have a predetermined specific composition, other requirements may be those of known TOPCon type solar cells.
- FIG. 1 is a schematic cross-sectional view showing an example of the structure of a TOPCon type solar cell.
- the TOPCon type solar cell shown in FIG. 1 has a p-type impurity layer 2 formed on the light-receiving surface side of an n-type silicon semiconductor substrate 1 as a base substrate, and a back electrode 6 on the back side of the n-type silicon semiconductor substrate 1. , an extremely thin oxide layer 3 between an n-type silicon semiconductor substrate 1 and a back electrode 6, and a microcrystalline n + silicon layer 4 doped with a dopant at a high concentration.
- the TOPCon type solar cell has a tunneling effect caused by the oxide layer 3, which connects the n-type silicon semiconductor substrate 1 (n - silicon layer) and the microcrystalline n + silicon layer 4 (n + silicon layer). Carrier loss at the interface can be suppressed.
- silicon oxide is applied, for example.
- the thickness of the oxide layer 3 is not limited, and can be, for example, 1 to 10 nm, preferably 3 to 8 nm.
- the thickness of the oxide layer 3 is 1 to 10 nm, the above-mentioned tunnel effect tends to occur, and carriers easily move to the back side of the solar cell, resulting in an increase in conversion efficiency.
- the thickness of the oxide layer 3 is 1 to 10 nm, carrier loss at the interface between the n ⁇ silicon layer and the n + silicon layer is easily suppressed, so that reduction in conversion efficiency is less likely to occur.
- silicon semiconductor substrates used, for example, in semiconductor applications or solar cell applications can be widely applied.
- a passivation film 5 is provided between the microcrystalline n + silicon layer 4 and the back electrode 6 . Since the conductive aluminum paste composition of the present invention has the fire-through property of the passivation film 5, there is no need to form an LCO (opening) in the passivation film 5 in forming the back electrode 6.
- a finger electrode (not shown in FIG. 1) is formed on the opposite side of the back electrode 6 of the n-type silicon semiconductor substrate 1 via a p-type impurity layer.
- the finger electrodes are made of silver, aluminum, or the like, for example.
- the back electrode 6 is formed from the conductive aluminum paste composition of the present invention.
- the conductive aluminum paste composition of the present invention contains aluminum-silicon alloy powder and glass powder of a specific composition, so that the paste itself forms a passivation film when forming the back electrode 6 of a TOPCon solar cell. 5, it is not necessary to form an LCO, and further, good ohmic contact can be obtained without forming an alloy layer with the n-type silicon semiconductor substrate 1.
- the coating film before firing of the back electrode 6 can be easily formed in that a known printing method such as a screen printing method can be employed.
- the conductive aluminum paste composition of the present invention is for use in TOPCon type solar cell electrodes, and in particular is used to form back electrodes.
- the paste composition contains an aluminum-silicon alloy powder, an organic vehicle, and a glass powder, (1)
- the aluminum-silicon alloy powder has a silicon concentration of 30% by mass or more and 40% by mass or less, (2) the glass powder contains a first glass powder and a second glass powder,
- the first glass powder contains PbO from 45% to 71%, B 2 O 3 from 5% to 35%, and SiO 2 from 0.1% to 25.0%, expressed as oxide mole%.
- the second glass powder contains B 2 O 3 in an amount of 35.0% to 55.0%, SiO 2 in an amount of 5.0% to 10.0%, and BaO 1.0% in terms of oxide mol%. 20.0% or more, CaO 5.0% or more and 25.0% or less, K 2 O 3.0% or more and 30.0% or less, and does not substantially contain PbO. It is characterized by
- the paste itself has fire-through properties of a passivation film in forming the back electrode of a TOPCon type solar cell, and there is no need to form an LCO.
- Good ohmic contact can be obtained without forming an alloy layer with the n-type silicon substrate.
- not forming an alloy layer with the n-type silicon substrate means that there is no erosion of the microcrystalline n + silicon layer, and being able to obtain good ohmic contact means that the contact resistance is 10 m ⁇ as an indicator of high conversion efficiency. cm 2 or less.
- aluminum-silicon alloy powder is a component that can play a role in providing conductivity.
- aluminum-silicon alloy powder having a silicon concentration of 30% by mass or more and 40% by mass or less (preferably 35% by mass or more and 40% by mass or less) is used.
- migration of the electrode material does not occur and the risk of short circuit is reduced compared to silver.
- the silicon concentration is 30% by mass or more and 40% by mass or less, it becomes difficult for the conductive aluminum paste composition to melt with the microcrystalline n + silicon layer in the firing process, and as a result, the conductive aluminum paste composition and the microcrystalline It becomes difficult to form an aluminum-silicon alloy layer with the n + silicon layer. As a result, reduction in cell conversion efficiency due to carrier loss is suppressed.
- the silicon concentration is less than 30% by mass, a p + layer is formed, which may cause a decrease in conversion efficiency. If the silicon concentration exceeds 40% by mass, the resistance may increase and it may become difficult to produce an aluminum-silicon alloy powder. Therefore, in the present invention, a material having a silicon concentration of 30% by mass or more and 40% by mass or less is used.
- the particle size of the aluminum-silicon alloy powder is not particularly limited.
- the volume average particle diameter D50 of the aluminum-silicon alloy powder (particles) can be set to 1 to 10 ⁇ m.
- the volume average particle diameter D50 is preferably 5 to 8 ⁇ m.
- the volume average particle diameter D50 of the aluminum-silicon alloy powder in this specification is a value measured by a laser diffraction method.
- the aluminum-silicon alloy powder may contain strontium as a third component. That is, as the conductive powder containing strontium, in addition to aluminum-silicon-strontium (Al-Si-Sr) alloy powder, a combination of aluminum-silicon alloy powder and aluminum-silicon-strontium alloy powder may be used.
- the amount of strontium contained in the conductive powder containing strontium is not particularly limited, but can be 0.01 to 1% by mass.
- the addition of strontium to the conductive powder has the effect of increasing the amount of liquid phase composition during firing when the silicon concentration is high, promoting sintering, and reducing surface resistance.
- the type of organic vehicle is not particularly limited, and for example, a wide range of known organic vehicles used for forming back electrodes of solar cells can be used.
- the organic vehicle include materials in which a resin is dissolved in a solvent.
- the organic vehicle may be solvent-free and the resin itself may be used.
- the type of solvent is not limited, and examples include diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, dipropylene glycol monomethyl ether, and the like.
- the organic vehicle may contain one or more kinds of solvents.
- the resin examples include various known resins, including ethyl cellulose resin, nitrocellulose resin, polyvinyl butyral resin, phenol resin, melamine resin, urea resin, xylene resin, alkyd resin, and unsaturated resin.
- Polyester resin acrylic resin, polyimide resin, furan resin, urethane resin, isocyanate compound, cyanate compound, polyethylene resin, polypropylene resin, polystyrene resin, ABS resin, polymethyl methacrylate resin, polyvinyl chloride resin, polyvinylidene chloride resin, poly Vinyl acetate resin, polyvinyl alcohol resin, polyacetal resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene oxide resin, polysulfone resin, polyimide resin, polyether sulfone resin, polyarylate resin, polyether ether ketone resin, poly Examples include tetrafluoroethylene resin and silicone resin.
- the organic vehicle may contain one or more resins.
- the organic vehicle can also contain various additives as necessary.
- additives include antioxidants, corrosion inhibitors, antifoaming agents, thickeners, dispersants, tackifiers, coupling agents, electrostatic agents, polymerization inhibitors, thixotropic agents, antisettling agents, etc. can be mentioned.
- polyethylene glycol ester compounds polyethylene glycol ether compounds, polyoxyethylene sorbitan ester compounds, sorbitan alkyl ester compounds, aliphatic polycarboxylic acid compounds, phosphoric acid ester compounds, amide amine salts of polyester acids, and polyethylene oxide compounds.
- fatty acid amide wax, alkaline earth metal salts of stearic acid, and the like are examples of additives.
- the proportions of the resin, solvent, and various additives contained in the organic vehicle can be adjusted as desired, and for example, the proportions of the components can be the same as those of known organic vehicles.
- the content of the organic vehicle is not particularly limited, but for example, from the viewpoint of having good coating properties (printability), it is 10 parts by mass or more and 500 parts by mass or less with respect to 100 parts by mass of the aluminum-silicon alloy powder. It is preferably 20 parts by mass or more and 45 parts by mass or less.
- the glass powder contained in the conductive aluminum paste composition of the present invention is a vitreous frit (powder).
- the glass powder contains a first glass powder (lead-containing glass) and a second glass powder (borosilicate glass that does not substantially contain lead),
- the first glass powder contains PbO from 45% to 71%, B 2 O 3 from 5% to 35%, and SiO 2 from 0.1% to 25.0%, expressed as oxide mol%.
- the content of B 2 O 3 is x mol %
- the content of SiO 2 is y mol %
- the content of PbO is z mol %
- the value of [(x+y)/z] is 0.40.
- the second glass powder contains B 2 O 3 in an amount of 35.0% to 55.0%, SiO 2 in an amount of 5.0% to 10.0%, and BaO 1.0% in terms of oxide mol%. 20.0% or more, CaO 5.0% or more and 25.0% or less, K 2 O 3.0% or more and 30.0% or less, and does not substantially contain PbO. It is characterized by the use of glass powder with a specific composition.
- the passivation film has excellent fire-through properties and forms an alloy layer (aluminum-silicon alloy layer) with the n-type silicon semiconductor substrate. (that is, the erosion of the microcrystalline n + silicon layer during the firing process is suppressed), and good ohmic contact can be obtained. As a result, the conversion efficiency of the solar cell can be increased.
- the first glass powder is a lead-containing glass, and contains PbO of 45% to 71%, B 2 O 3 of 5% to 35%, and SiO 2 of 0.1% to 25%, expressed as oxide mole %. 0% or less, and the content of B 2 O 3 is x mol %, the content of SiO 2 is y mol %, the content of PbO is z mol %, and [(x+y)/z] The value is in the range of 0.40 or more and 1.00 or less.
- the PbO content of the first glass powder can be set to 50% or more and 71% or less, and can be set to 60% or more and 71% or more.
- the content of B 2 O 3 can be set at 10% or more and 32% or less, and can be set at 20% or more and 32% or less.
- the content of SiO 2 can be set at 1.0% or more and 23.0% or less, and can be set at 8.0% or more and 23.0% or less.
- the value of [(x+y)/z] can be set to 0.40 or more and 0.90 or less, and can be set to 0.43 or more and 0.86 or less.
- the first glass powder may contain a total of 1% or more and 10% or less of Al 2 O 3 and/or ZnO expressed as oxide mole %. By containing these components, the weather resistance of the first glass powder can be improved and the paste viscosity can be stabilized.
- the content of Al 2 O 3 can be set, for example, to 1% or more and 7% or less.
- the content of ZnO can be set, for example, to 2% or more and 5% or less, and can be set to 3% or more and 4% or less.
- the second glass powder is borosilicate glass that does not substantially contain lead, and contains 35.0% or more of B 2 O 3 and 55.0% or less and SiO 2 of 5.0% or more in terms of oxide mole%. 10.0% or less, BaO from 1.0% to 20.0%, CaO from 5.0% to 25.0%, K 2 O from 3.0% to 30.0%, and Contains substantially no PbO.
- the content of B 2 O 3 in the second glass powder can be set to 40.0% or more and 53.0% or less, and can be set to 41.2% or more and 45.5% or less.
- the content of SiO 2 can be set at 6.5% or more and 9.0% or less, and can be set at 6.9% or more and 7.6% or less.
- the content of BaO can be set at 10.0% or more and 20.0% or less, and can be set at 15.1% or more and 18.4% or less.
- the content of CaO can be set at 6.0% or more and 20.0% or less, and can be set at 6.4% or more and 19.0% or less.
- the content of K 2 O can be set to 10.0% or more and 30.0% or less, and can be set to 11.4% or more and 20.1% or less.
- the second glass powder does not substantially contain a lead component (PbO), which means that the lead component is below the detection limit according to component analysis, or the content can be considered as an inevitable impurity.
- PbO lead component
- the second glass powder may contain 1.0% or more and 10.0% or less of SrO expressed in oxide mole%.
- the content of SrO can be set to 3.0% or more and 6.0% or less.
- the weather resistance of the second glass powder can be improved and the paste viscosity can be stabilized.
- the second glass powder may contain ZnO in an amount of 0.0% (including an embodiment in which it does not substantially contain) to 25.0% in terms of oxide mole %.
- the content of ZnO can be set at 1.0% or more and 25.0% or less, and can be set at 5.0% or more and 25.0% or less.
- the content of the glass powder is not particularly limited, but for example, from the viewpoint of the balance between the adhesion to the n-type silicon semiconductor substrate and the electrical resistance of the back electrode, the content of the first glass is added to 100 parts by mass of the aluminum-silicon alloy powder.
- the total amount of the powder and the second glass powder is preferably 0.5 parts by mass or more and 40 parts by mass or less, and more preferably 4 parts by mass or more and 15 parts by mass or less.
- the softening point of each glass powder is preferably 650° C. or lower, and the volume average particle diameter D50 of the glass particles constituting each glass powder is preferably 1 to 3 ⁇ m.
- the conductive aluminum paste composition of the present invention is useful as a paste composition for the back electrode of the TOPCon solar cell described at the beginning.
- the present invention also includes the invention of a TOPCon type solar cell characterized in that a back electrode which is a fired product of a conductive aluminum paste composition is laminated.
- the firing temperature when firing the coating film of the conductive aluminum paste composition is not limited as long as the desired back electrode is formed, but the firing temperature is preferably 700°C or higher. This prevents the conductive aluminum paste composition and the microcrystalline n + silicon layer from forming an alloy layer (aluminum-silicon alloy layer), making it easier to form a desired back electrode.
- the upper limit of the firing temperature is preferably lower than the melting point of the aluminum-silicon alloy powder contained in the conductive aluminum paste composition, and in this case, the conductive aluminum paste composition and the microcrystalline n + silicon layer form an alloy layer. It becomes even more difficult to form. From this point of view, the firing temperature is preferably 900°C or lower, more preferably 850°C or lower, and particularly preferably 800°C or lower.
- the firing time of the coating film can be determined as appropriate depending on the firing temperature.
- the time can be 1 minute or more and 300 minutes or less, and preferably 1 minute or more and 5 minutes or less.
- Firing may be performed in either an air atmosphere or a nitrogen atmosphere.
- the firing method is not particularly limited either, and, for example, the firing process can be performed using a known heating furnace.
- Example 1 Aluminum-silicon alloy powder was produced by gas atomization.
- the aluminum-silicon alloy powder was produced so that the silicon concentration was 36% by mass and the volume average particle diameter D50 was 6.0 ⁇ m.
- the first glass powder is a lead-containing glass powder (abbreviation P1) consisting of PbO: 50.00 mol%, SiO 2 : 23.00 mol%, B 2 O 3 : 20.00 mol%, Al 2 O 3 : 7.00 mol%.
- the second glass powder B 2 O 3 45.50 mol %, SiO 2 : 7.60 mol %, CaO: 19.00 mol %, BaO: 15.90 mol %, K 2 O: 12.00 mol %.
- a mixed glass powder was prepared by mixing acid glass powder (abbreviation B1) at a mass ratio of 1:1.
- a resin solution with a concentration of 10% by mass in which ethyl cellulose was dissolved in butyl diglycol was prepared as an organic vehicle.
- Example 2 The first glass powder is lead consisting of PbO: 54.40 mol%, SiO 2 : 12.80 mol%, B 2 O 3 : 23.50 mol%, Al 2 O 3 : 5.70 mol%, ZnO: 3.60 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that the containing glass powder (P2) was used.
- Example 3 The first glass powder composition consists of PbO: 45.00 mol%, SiO 2 : 15.00 mol%, B 2 O 3 : 30.00 mol%, Al 2 O 3 : 7.00 mol%, ZnO: 3.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that lead-containing glass powder (P3) was used.
- the first glass powder is a lead-containing glass powder (P4) consisting of PbO: 60.00 mol%, SiO 2 : 14.00 mol%, B 2 O 3 : 22.00 mol%, Al 2 O 3 : 4.00 mol%.
- P4 lead-containing glass powder
- a conductive aluminum paste composition was obtained in the same manner as in Example 1 except that .
- Example 5 The first glass powder is lead consisting of PbO: 63.00 mol%, SiO 2 : 8.00 mol%, B 2 O 3 : 22.00 mol%, Al 2 O 3 : 3.00 mol%, ZnO: 4.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that the containing glass powder (P5) was used.
- Example 6 A lead-containing glass powder (P6) consisting of PbO: 66.00 mol%, SiO 2 : 1.00 mol%, B 2 O 3 : 32.00 mol%, Al 2 O 3 : 1.00 mol% was used as the first glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except for using the same method as in Example 1.
- Example 7 A lead-containing glass powder (P7) consisting of PbO: 71.00 mol%, SiO 2 : 16.00 mol%, and B 2 O 3 : 13.00 mol% was used as the first glass powder, and B as the second glass powder.
- Borosilicate consisting of 2 O 3 : 43.70 mol%, SiO 2 : 7.10 mol%, CaO: 18.00 mol%, BaO: 15.10 mol%, SrO: 4.70 mol%, K 2 O: 11.40 mol%
- a conductive aluminum paste composition was obtained in the same manner as in Example 1 except that glass powder (B2) was used.
- Example 8 As the second glass powder, borosilicate consisting of B 2 O 3 : 52.60 mol%, SiO 2 : 8.70 mol%, CaO: 6.40 mol%, BaO: 18.40 mol%, K 2 O: 13.90 mol% A conductive aluminum paste composition was obtained in the same manner as in Example 1 except that glass powder (B3) was used.
- Example 9 As the second glass powder, borosilicate consisting of B 2 O 3 : 41.20 mol%, SiO 2 : 6.90 mol%, CaO: 17.30 mol%, BaO: 14.50 mol%, K 2 O: 20.10 mol% A conductive aluminum paste composition was obtained in the same manner as in Example 5, except that glass powder (B4) was used.
- Example 10 A conductive aluminum paste composition was obtained in the same manner as in Example 3, except that an aluminum-silicon alloy powder having a D50 of 6.0 ⁇ m and a silicon concentration of 30% by mass, which was produced by a gas atomization method, was used.
- Example 11 A conductive aluminum paste composition was obtained in the same manner as in Example 3, except that an aluminum-silicon alloy powder having a D50 of 6.0 ⁇ m and a silicon concentration of 40% by mass, which was produced by a gas atomization method, was used.
- Comparative example 1 A conductive aluminum paste composition was obtained in the same manner as in Example 1, except that aluminum powder having a D50 of 6.0 ⁇ m (silicon concentration was 0% by mass) manufactured by the gas atomization method was used.
- Comparative example 2 A conductive aluminum paste composition was obtained in the same manner as in Example 1, except that an aluminum-silicon alloy powder having a D50 of 6.0 ⁇ m and a silicon concentration of 25% by mass, which was produced by a gas atomization method, was used.
- Comparative example 3 Except that a lead-containing glass powder (P8) consisting of PbO: 13.00 mol%, SiO 2 : 5.00 mol%, B 2 O 3 : 28.00 mol%, and ZnO: 54.00 mol% was used as the first glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1.
- Comparative example 4 Lead consisting of PbO: 34.00 mol%, SiO 2 : 57.00 mol%, B 2 O 3 : 5.00 mol%, Al 2 O 3 : 2.00 mol%, ZnO: 2.00 mol% as the first glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that the containing glass powder (P9) was used.
- Comparative example 6 A lead-containing glass powder (P11) consisting of PbO: 47.00 mol%, SiO 2 : 42.00 mol%, B 2 O 3 : 8.00 mol%, Al 2 O 3: 3.00 mol% was used as the first glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 8, except that it was used.
- the first glass powder is lead consisting of PbO: 54.00 mol%, SiO 2 : 15.00 mol%, B 2 O 3 : 4.00 mol%, Al 2 O 3 : 6.00 mol%, ZnO: 21.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that the containing glass powder (P12) was used.
- Comparative example 8 Same as Example 1 except that lead-containing glass powder (P13) consisting of PbO: 74.00 mol%, SiO 2 : 16.00 mol%, and B 2 O 3 : 10.00 mol% was used as the first glass powder.
- a conductive aluminum paste composition was obtained by the method described above.
- Comparative example 9 A lead-containing glass powder (P14) consisting of PbO: 76.00 mol%, SiO 2 : 16.00 mol%, B 2 O 3 : 4.00 mol%, Al 2 O 3 : 4.00 mol% was used as the first glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 8, except that it was used.
- Comparative example 10 Conductive aluminum paste composition was prepared in the same manner as in Example 8, except that a lead-containing glass powder (P15) consisting of PbO: 80.00 mol% and B 2 O 3 : 20.00 mol% was used as the first glass powder. I got something.
- P15 lead-containing glass powder
- Comparative example 11 Except for using borosilicate glass powder (B5) consisting of B 2 O 3 : 52.10 mol%, SiO 2 : 8.50 mol%, CaO: 21.50 mol%, BaO: 17.90 mol% as the second glass powder.
- B5 borosilicate glass powder
- SiO 2 : 8.50 mol%
- CaO 21.50 mol%
- BaO 17.90 mol%
- a conductive aluminum paste composition was obtained in the same manner as in Example 1.
- the second glass powder is a borosilicate glass powder consisting of B2O3 : 47.40 mol%, SiO2 : 7.70 mol%, CaO: 19.50 mol%, BaO: 16.30 mol%, PbO: 9.10 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1 except that (B6) was used.
- Comparative example 15 As the second glass powder, B 2 O 3 : 54.10 mol%, SiO 2 : 4.50 mol%, CaO: 6.00 mol%, BaO: 18.40 mol%, SrO: 4.80 mol%, K 2 O: 5 A conductive aluminum paste composition was obtained in the same manner as in Example 1, except that borosilicate glass powder (B9) consisting of ZnO: .50 mol% and ZnO: 6.70 mol% was used.
- Comparative example 16 As the second glass powder, borosilicate consisting of B 2 O 3 : 38.90 mol%, SiO 2 : 30.70 mol%, CaO: 6.40 mol%, BaO: 12.80 mol%, K 2 O: 11.20 mol% A conductive aluminum paste composition was obtained in the same manner as in Example 1 except that glass powder (B10) was used.
- Comparative example 18 As the second glass powder, borosilicate consisting of B 2 O 3 : 43.40 mol%, SiO 2 : 8.70 mol%, CaO: 7.90 mol%, BaO: 30.00 mol%, K 2 O: 10.00 mol% A conductive aluminum paste composition was obtained in the same manner as in Example 1 except that glass powder (B12) was used.
- Borosilicate glass powder (B13) consisting of B 2 O 3 : 45.50 mol%, SiO 2 : 9.90 mol%, BaO: 18.40 mol%, K 2 O: 26.20 mol% was used as the second glass powder.
- a conductive aluminum paste composition was obtained in the same manner as in Example 1 except for the following.
- B 2 O 3 32.00 mol%, SiO 2 : 7.60 mol%, CaO: 35.10 mol%, BaO: 10.00 mol%, SrO: 3.30 mol%, K 2 O: 2
- a conductive aluminum paste composition was obtained in the same manner as in Example 1, except that borosilicate glass powder (B14) consisting of ZnO: .00 mol% and ZnO: 10.00 mol% was used.
- Example 12 The second glass powder composition consists of B 2 O 3 : 36.00 mol%, SiO 2 : 10.00 mol%, CaO: 19.00 mol%, BaO: 15.00 mol%, K 2 O: 20.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that acid glass powder (B16) was used.
- Example 13 The second glass powder composition consists of B 2 O 3 : 43.50 mol%, SiO 2 : 7.10 mol%, CaO: 23.00 mol%, BaO: 15.00 mol%, K 2 O: 11.40 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that acid glass powder (B18) was used.
- Example 14 The second glass powder composition consists of B 2 O 3 : 48.50 mol%, SiO 2 : 7.50 mol%, CaO: 18.90 mol%, BaO: 3.20 mol%, K 2 O: 21.90 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that acid glass powder (B20) was used.
- Example 15 The second glass powder composition is B 2 O 3 : 43.70 mol%, SiO 2 : 9.90 mol%, CaO: 9.00 mol%, BaO: 4.70 mol%, SrO: 5.30 mol%, K 2 O: A conductive aluminum paste composition was obtained in the same manner as in Example 4, except that borosilicate glass powder (B22) consisting of 3.10 mol% and 24.30 mol% of ZnO was used.
- Example 16 The second glass powder composition is B 2 O 3 : 40.20 mol%, SiO 2 : 9.50 mol%, CaO: 5.00 mol%, BaO: 5.80 mol%, SrO: 3.30 mol%, K 2 O: A conductive aluminum paste composition was obtained in the same manner as in Example 4, except that borosilicate glass powder (B23) consisting of 28.50 mol% and 7.70 mol% of ZnO was used.
- B23 borosilicate glass powder
- the first glass powder composition consists of PbO: 45.00 mol%, SiO 2 : 27.00 mol%, B 2 O 3 : 20.00 mol%, Al 2 O 3 : 2.00 mol%, ZnO: 6.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 8, except that lead-containing glass powder (P16) was used.
- Comparative example 23 Lead-containing glass powder (P17) whose first glass powder composition is PbO: 45.00 mol%, SiO 2 : 16.00 mol%, B 2 O 3 : 38.00 mol%, Al 2 O 3 : 1.00 mol%.
- a conductive aluminum paste composition was obtained in the same manner as in Example 8, except that .
- the second glass powder composition is B 2 O 3 : 40.00 mol%, SiO 2 : 11.00 mol%, CaO: 15.00 mol%, BaO: 20.00 mol%, K 2 O: 4.00 mol%, ZnO:
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that borosilicate glass powder (B17) containing 10.00 mol% was used.
- the second glass powder composition is B2O3 : 36.10 mol%, SiO2 : 8.70 mol%, CaO: 27.10 mol%, BaO: 8.90 mol%, K2O : 9.80 mol%, ZnO:
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that borosilicate glass powder (B19) containing 9.40 mol % was used.
- the second glass powder composition is B 2 O 3 : 38.70 mol%, SiO 2 : 9.70 mol%, CaO: 8.80 mol%, BaO: 22.20 mol%, K 2 O: 9.50 mol%, ZnO:
- a conductive aluminum paste composition was obtained in the same manner as in Example 4, except that borosilicate glass powder (B21) containing 11.10 mol % was used.
- an oxide (silicon oxide) layer 3 with a thickness of 5 nm A wafer in which a microcrystalline n + silicon layer 4 and a passivation film 5 having a thickness of 200 nm were stacked was prepared.
- the conductive aluminum paste compositions prepared in Examples and Comparative Examples were printed to a thickness of 20 to 30 ⁇ m, a width of 1 mm, a length of 10 mm, and a printing interval of 1.2 mm and 1.4 mm. , 1.6 mm, 1.8 mm, and 2.0 mm were set in parallel and screen printing was performed.
- the printed laminate was placed in an infrared belt furnace set at 700° C. and fired at this temperature to form the back electrode 6. As a result, a fired substrate for evaluation was manufactured.
- the electrical resistance of the obtained fired substrate for evaluation was measured using a resistance measuring device manufactured by Hioki Electric Co., Ltd. (product name: Milliohm HiTESTER HiTESTER 3540), and the back electrode 6 was measured using the TLM (Transmission line method) method.
- the contact resistance between the microcrystalline n + silicon layer 4 and the microcrystalline n + silicon layer 4 was calculated.
- the contact resistance at which good ohmic contact can be obtained is 10 m ⁇ cm 2 or less.
- the conductive aluminum paste composition prepared in Examples and Comparative Examples was printed on the back side of the wafer in a comb pattern at a rate of 0.2 to 0.3 g/cell, and then printed on the light-receiving surface of the wafer.
- a silver paste for forming finger electrodes was printed, and a back electrode and finger electrodes were formed using an infrared belt furnace set at 800°C. In this way, a solar cell was produced.
- the paste itself has fire-through properties of the passivation film in forming the back electrode of the TOPCon type solar cell. It was confirmed that it is possible to obtain good ohmic contact without the need to form an LCO and also without forming an alloy layer with the n-type silicon substrate.
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Abstract
Description
1. アルミニウム-シリコン合金粉末と、有機ビヒクルと、ガラス粉末とを含有する導電性アルミニウムペースト組成物であって、
(1)前記アルミニウム-シリコン合金粉末は、シリコン濃度が30質量%以上40質量%以下であり、
(2)前記ガラス粉末は、第一のガラス粉末と第二のガラス粉末とを含有し、
前記第一のガラス粉末は、酸化物モル%表記でPbOを45%以上71%以下、B2O3を5%以上35%以下、SiO2を0.1%以上25.0%以下含有し、且つ前記B2O3の含有量をxモル%、前記SiO2の含有量をyモル%、前記PbOの含有量をzモル%とし、〔(x+y)/z〕の値が0.40以上1.00以下の範囲であり、
前記第二のガラス粉末は、酸化物モル%表記でB2O3を35.0%以上55.0%以下、SiO2を5.0%以上10.0%以下、BaOを1.0%以上20.0%以下、CaOを5.0%以上25.0%以下、K2Oを3.0%以上30.0%以下含有し、且つPbOを実質的に含有しない、
ことを特徴とするTOPCon型太陽電池電極用導電性アルミニウムペースト組成物。
2.前記第一のガラス粉末は、酸化物モル%表記でAl2O3及び/又はZnOを合計で1%以上10%以下含有する、上記項1に記載の導電性アルミニウムペースト組成物。
3.前記第二のガラス粉末は、酸化物モル%表記でSrOを1.0%以上10.0%以下含有する、上記項1又は2に記載の導電性アルミニウムペースト組成物。
4.シリコン半導体基板に、上記項1~3のいずれかに記載の導電性アルミニウムペースト組成物の焼成物である裏面電極が積層されているTOPCon型太陽電池。
本発明の導電性アルミニウムペースト組成物はTOPCon型太陽電池電極用であるが、導電性アルミニウムペースト組成物がアルミニウム-シリコン合金粉末と、有機ビヒクルと、ガラス粉末とを含有し、特にアルミニウム-シリコン合金粉末とガラス粉末とが所定の特定組成を有する限り、他の要件は公知のTOPCon型太陽電池の要件を適用することができる。
本発明の導電性アルミニウムペースト組成物は、TOPCon型太陽電池電極用であり、詳細には裏面電極の形成に使用される。当該ペースト組成物は、アルミニウム-シリコン合金粉末と、有機ビヒクルと、ガラス粉末とを含有し、
(1)前記アルミニウム-シリコン合金粉末は、シリコン濃度が30質量%以上40質量%以下であり、
(2)前記ガラス粉末は、第一のガラス粉末と第二のガラス粉末とを含有し、
前記第一のガラス粉末は、酸化物モル%表記でPbOを45%以上71%以下、B2O3を5%以上35%以下、SiO2を0.1%以上25.0%以下含有し、且つ前記B2O3の含有量をxモル%、前記SiO2の含有量をyモル%、前記PbOの含有量をzモル%とし、〔(x+y)/z〕の値が0.40以上1.00以下の範囲であり、
前記第二のガラス粉末は、酸化物モル%表記でB2O3を35.0%以上55.0%以下、SiO2を5.0%以上10.0%以下、BaOを1.0%以上20.0%以下、CaOを5.0%以上25.0%以下、K2Oを3.0%以上30.0%以下含有し、且つPbOを実質的に含有しない、
ことを特徴とする。
導電性アルミニウムペースト組成物において、アルミニウム-シリコン合金粉末は導電性をもたらす役割を果たし得る成分である。本発明の導電性アルミニウムペースト組成物では、アルミニウム-シリコン合金粉末としてシリコン濃度が30質量%以上40質量%以下(好ましくは35質量%以上40質量%以下)であるものを用いる。本発明では、導電性成分としてアルミニウム-シリコン合金粉末を用いることにより、銀と比較して電極材料のマイグレーションが生じることがなく短絡のおそれが低減されている。
本発明の導電性アルミニウムペースト組成物において、有機ビヒクルの種類は特に限定されず、例えば、太陽電池の裏面電極を形成するために用いられる公知の有機ビヒクルを広く適用することができる。有機ビヒクルとして、溶剤に樹脂が溶解した材料を挙げることができる。又は、有機ビヒクルは、溶剤を含まず、樹脂そのものを使用してもよい。
本発明の導電性アルミニウムペースト組成物に含まれるガラス粉末とは、ガラス質のフリット(粉末)である。特に本発明では、ガラス粉末として第一のガラス粉末(鉛含有ガラス)と第二のガラス粉末(実質的に鉛を含有しないホウケイ酸ガラス)とを含有し、
前記第一のガラス粉末は、酸化物モル%表記でPbOを45%以上71%以下、B2O3を5%以上35%以下、SiO2を0.1%以上25.0%以下含有し、且つ前記B2O3の含有量をxモル%、前記SiO2の含有量をyモル%、前記PbOの含有量をzモル%とし、〔(x+y)/z〕の値が0.40以上1.00以下の範囲であり、
前記第二のガラス粉末は、酸化物モル%表記でB2O3を35.0%以上55.0%以下、SiO2を5.0%以上10.0%以下、BaOを1.0%以上20.0%以下、CaOを5.0%以上25.0%以下、K2Oを3.0%以上30.0%以下含有し、且つPbOを実質的に含有しない、
特定組成のガラス粉末を採用することを特徴とする。
ガスアトマイズ法により、アルミニウム-シリコン合金粉末を製造した。アルミニウム-シリコン合金粉末は、シリコン濃度が36質量%、体積平均粒子径D50が6.0μmとなるように製造した。第一のガラス粉末としてPbO:50.00mol%、SiO2:23.00mol%、B2O3:20.00mol%、Al2O3:7.00mol%からなる鉛含有ガラス粉末(略号P1)、第二のガラス粉末としてB2O3:45.50mol%、SiO2:7.60mol%、CaO:19.00mol%、BaO:15.90mol%、K2O:12.00mol%からなるホウケイ酸ガラス粉末(略号B1)を質量比1:1で混合した混合ガラス粉末を準備した。また、有機ビヒクルとしてエチルセルロースがブチルジグリコールに溶解した10質量%濃度の樹脂溶液を準備した。
第一のガラス粉末としてPbO:54.40mol%、SiO2:12.80mol%、B2O3:23.50mol%、Al2O3:5.70mol%、ZnO:3.60mol%からなる鉛含有ガラス粉末(P2)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末組成がPbO:45.00mol%、SiO2:15.00mol%、B2O3:30.00mol%、Al2O3:7.00mol%、ZnO:3.00mol%からなる鉛含有ガラス粉末(P3)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてがPbO:60.00mol%、SiO2:14.00mol%、B2O3:22.00mol%、Al2O3:4.00mol%からなる鉛含有ガラス粉末(P4)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:63.00mol%、SiO2:8.00mol%、B2O3:22.00mol%、Al2O3:3.00mol%、ZnO:4.00mol%からなる鉛含有ガラス粉末(P5)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:66.00mol%、SiO2:1.00mol%、B2O3:32.00mol%、Al2O3:1.00mol%からなる鉛含有ガラス粉末(P6)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:71.00mol%、SiO2:16.00mol%、B2O3:13.00mol%からなる鉛含有ガラス粉末(P7)を使用し、第二のガラス粉末としてB2O3:43.70mol%、SiO2:7.10mol%、CaO:18.00mol%、BaO:15.10mol%、SrO:4.70mol%、K2O:11.40mol%からなるホウケイ酸ガラス粉末(B2)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:52.60mol%、SiO2:8.70mol%、CaO:6.40mol%、BaO:18.40mol%、K2O:13.90mol%からなるホウケイ酸ガラス粉末(B3)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:41.20mol%、SiO2:6.90mol%、CaO:17.30mol%、BaO:14.50mol%、K2O:20.10mol%からなるホウケイ酸ガラス粉末(B4)を使用した以外は、実施例5と同様の方法で導電性アルミニウムペースト組成物を得た。
ガスアトマイズ法により製造した、D50が6.0μm、シリコン濃度が30質量%のアルミニウム-シリコン合金粉末を使用した以外は、実施例3と同様の方法で導電性アルミニウムペースト組成物を得た。
ガスアトマイズ法により製造した、D50が6.0μm、シリコン濃度が40質量%のアルミニウム-シリコン合金粉末を使用した以外は、実施例3と同様の方法で導電性アルミニウムペースト組成物を得た。
ガスアトマイズ法により製造した、D50が6.0μmのアルミニウム粉末(シリコン濃度は0質量%)を使用した以外は、実施例1と同様にして導電性アルミニウムペースト組成物を得た。
ガスアトマイズ法により製造した、D50が6.0μm、シリコン濃度が25質量%のアルミニウム-シリコン合金粉末を使用した以外は、実施例1と同様にして導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:13.00mol%、SiO2:5.00mol%、B2O3:28.00mol%、ZnO:54.00mol%からなる鉛含有ガラス粉末(P8)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:34.00mol%、SiO2:57.00mol%、B2O3:5.00mol%、Al2O3:2.00mol%、ZnO:2.00mol%からなる鉛含有ガラス粉末(P9)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:40.00mol%、B2O3:60.00mol%からなる鉛含有ガラス粉末(P10)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:47.00mol%、SiO2:42.00mol%、B2O3:8.00mol%、Al2O3:3.00mol%からなる鉛含有ガラス粉末(P11)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:54.00mol%、SiO2:15.00mol%、B2O3:4.00mol%、Al2O3:6.00mol%、ZnO:21.00mol%からなる鉛含有ガラス粉末(P12)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:74.00mol%、SiO2:16.00mol%、B2O3:10.00mol%からなる鉛含有ガラス粉末(P13)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:76.00mol%、SiO2:16.00mol%、B2O3:4.00mol%、Al2O3:4.00mol%からなる鉛含有ガラス粉末(P14)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末としてPbO:80.00mol%、B2O3:20.00mol%からなる鉛含有ガラス粉末(P15)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:52.10mol%、SiO2:8.50mol%、CaO:21.50mol%、BaO:17.90mol%からなるホウケイ酸ガラス粉末(B5)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:47.40mol%、SiO2:7.70mol%、CaO:19.50mol%、BaO:16.30mol%、PbO:9.10mol%からなるホウケイ酸ガラス粉末(B6)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:22.10mol%、SiO2:8.60mol%、CaO:11.40mol%、BaO:19.60mol%、K2O:6.70mol%、ZnO:31.60mol%からなるホウケイ酸ガラス粉末(B7)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:55.20mol%、SiO2:8.80mol%、CaO:5.30mol%、BaO:15.90mol%、K2O:9.00mol%、ZnO:5.80mol%からなるホウケイ酸ガラス粉末(B8)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:54.10mol%、SiO2:4.50mol%、CaO:6.00mol%、BaO:18.40mol%、SrO:4.80mol%、K2O:5.50mol%、ZnO:6.70mol%からなるホウケイ酸ガラス粉末(B9)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:38.90mol%、SiO2:30.70mol%、CaO:6.40mol%、BaO:12.80mol%、K2O:11.20mol%からなるホウケイ酸ガラス粉末(B10)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:45.50mol%、SiO2:8.90mol%、CaO:20.00mol%、BaO:0.40mol%、SrO:4.20mol%、K2O:14.50mol%、ZnO:6.50mol%からなるホウケイ酸ガラス粉末(B11)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:43.40mol%、SiO2:8.70mol%、CaO:7.90mol%、BaO:30.00mol%、K2O:10.00mol%からなるホウケイ酸ガラス粉末(B12)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:45.50mol%、SiO2:9.90mol%、BaO:18.40mol%、K2O:26.20mol%からなるホウケイ酸ガラス粉末(B13)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:32.00mol%、SiO2:7.60mol%、CaO:35.10mol%、BaO:10.00mol%、SrO:3.30mol%、K2O:2.00mol%、ZnO:10.00mol%からなるホウケイ酸ガラス粉末(B14)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末としてB2O3:39.50mol%、SiO2:7.60mol%、CaO:5.50mol%、BaO:9.80mol%、K2O:35.60mol%、ZnO:2.09mol%からなるホウケイ酸ガラス粉末(B15)を使用した以外は、実施例1と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:36.00mol%、SiO2:10.00mol%、CaO:19.00mol%、BaO:15.00mol%、K2O:20.00mol%からなるホウケイ酸ガラス粉末(B16)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:43.50mol%、SiO2:7.10mol%、CaO:23.00mol%、BaO:15.00mol%、K2O:11.40mol%からなるホウケイ酸ガラス粉末(B18)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:48.50mol%、SiO2:7.50mol%、CaO:18.90mol%、BaO:3.20mol%、K2O:21.90mol%からなるホウケイ酸ガラス粉末(B20)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:43.70mol%、SiO2:9.90mol%、CaO:9.00mol%、BaO:4.70mol%、SrO:5.30mol%、K2O:3.10mol%、ZnO:24.30mol%からなるホウケイ酸ガラス粉末(B22)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:40.20mol%、SiO2:9.50mol%、CaO:5.00mol%、BaO:5.80mol%、SrO:3.30mol%、K2O:28.50mol%、ZnO:7.70mol%からなるホウケイ酸ガラス粉末(B23)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末組成がPbO:45.00mol%、SiO2:27.00mol%、B2O3:20.00mol%、Al2O3:2.00mol%、ZnO:6.00mol%からなる鉛含有ガラス粉末(P16)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第一のガラス粉末組成がPbO:45.00mol%、SiO2:16.00mol%、B2O3:38.00mol%、Al2O3:1.00mol%からなる鉛含有ガラス粉末(P17)を使用した以外は、実施例8と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:40.00mol%、SiO2:11.00mol%、CaO:15.00mol%、BaO:20.00mol%、K2O:4.00mol%、ZnO:10.00mol%からなるホウケイ酸ガラス粉末(B17)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:36.10mol%、SiO2:8.70mol%、CaO:27.10mol%、BaO:8.90mol%、K2O:9.80mol%、ZnO:9.40mol%からなるホウケイ酸ガラス粉末(B19)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
第二のガラス粉末組成がB2O3:38.70mol%、SiO2:9.70mol%、CaO:8.80mol%、BaO:22.20mol%、K2O:9.50mol%、ZnO:11.10mol%からなるホウケイ酸ガラス粉末(B21)を使用した以外は、実施例4と同様の方法で導電性アルミニウムペースト組成物を得た。
図1、図2に示す様に、n型シリコン半導体基板1にp型不純物層2を設けた面とは反対側の面に、内側から順に厚さ5nmの酸化物(酸化ケイ素)層3、厚さ200nmの微結晶n+シリコン層4及びパッシベーション膜5が積層されたウェハを準備した。このウェハの裏面に、実施例及び比較例で調製した導電性アルミニウムペースト組成物を、印刷後の厚みが20~30μm、幅が1mm、長さが10mm、印刷間隔が1.2mm、1.4mm、1.6mm、1.8mm及び2.0mmの条件で並列するように設定してスクリーン印刷した。次に印刷後の積層体を700℃に設定した赤外ベルト炉に設置し、この温度で焼成することにより裏面電極6の形成を行った。これにより、評価用の焼成基板を製作した。
日置電機株式会社製の抵抗測定器(製品名:ミリオームハイテスタHiTESTER 3540)を用いて、得られた評価用の焼成基板の電気抵抗を測定し、TLM(Transmission line method)法により、裏面電極6と微結晶n+シリコン層4との接触抵抗を算出した。良好なオーミックコンタクトを得ることができる接触抵抗は10mΩ・cm2以下である。
前記ウェハの裏面に、実施例及び比較例で調製した導電性アルミニウムペースト組成物を0.2~0.3g/1セルになるように櫛歯パターンに印刷し、次に前記ウェハの受光面にフィンガー電極形成用銀ペーストを印刷し、800℃に設定した赤外ベルト炉を用いて裏面電極及びフィンガー電極を形成した。これにより、太陽電池セルを作製した。
太陽電池セルに形成された裏面電極6を、常温の塩酸水溶液に60分間浸すことで除去した後、光学顕微鏡により観察し、パッシベーション膜5の貫通の有無を確認した。パッシベーション膜を5を貫通している(ファイヤースルーしている)ものを「A」、パッシベーション膜5を貫通していなかったものを「B」と評価した。また、パッシベーション膜5を貫通しているものについては、走査型電子顕微鏡(SEM)により観察し、微結晶n+シリコン層4の侵食の有無を確認した。微結晶n+シリコン層4を侵食していなかったものを「A」、侵食していたものを「B」として評価した。パッシベーション膜5を貫通していないものは微結晶n+シリコン層4の侵食の有無は確認できないため「-」と表記した。
2.p型不純物層
3.酸化物層
4.微結晶n+シリコン層
5.パッシベーション膜
6.導電性アルミニウムペースト組成物の焼成物(裏面電極)
Claims (4)
- アルミニウム-シリコン合金粉末と、有機ビヒクルと、ガラス粉末とを含有する導電性アルミニウムペースト組成物であって、
(1)前記アルミニウム-シリコン合金粉末は、シリコン濃度が30質量%以上40質量%以下であり、
(2)前記ガラス粉末は、第一のガラス粉末と第二のガラス粉末とを含有し、
前記第一のガラス粉末は、酸化物モル%表記でPbOを45%以上71%以下、B2O3を5%以上35%以下、SiO2を0.1%以上25.0%以下含有し、且つ前記B2O3の含有量をxモル%、前記SiO2の含有量をyモル%、前記PbOの含有量をzモル%とし、〔(x+y)/z〕の値が0.40以上1.00以下の範囲であり、
前記第二のガラス粉末は、酸化物モル%表記でB2O3を35.0%以上55.0%以下、SiO2を5.0%以上10.0%以下、BaOを1.0%以上20.0%以下、CaOを5.0%以上25.0%以下、K2Oを3.0%以上30.0%以下含有し、且つPbOを実質的に含有しない、
ことを特徴とするTOPCon型太陽電池電極用導電性アルミニウムペースト組成物。 - 前記第一のガラス粉末は、酸化物モル%表記でAl2O3及び/又はZnOを合計で1%以上10%以下含有する、請求項1に記載の導電性アルミニウムペースト組成物。
- 前記第二のガラス粉末は、酸化物モル%表記でSrOを1.0%以上10.0%以下含有する、請求項1に記載の導電性アルミニウムペースト組成物。
- シリコン半導体基板に、請求項1~3のいずれかに記載の導電性アルミニウムペースト組成物の焼成物である裏面電極が積層されているTOPCon型太陽電池。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130042392A (ko) * | 2011-10-18 | 2013-04-26 | 동우 화인켐 주식회사 | 알루미늄 페이스트 조성물 및 이를 이용한 태양전지 소자 |
| JP2016213284A (ja) * | 2015-05-01 | 2016-12-15 | 東洋アルミニウム株式会社 | Perc型太陽電池用アルミニウムペースト組成物 |
| JP2019127404A (ja) * | 2018-01-23 | 2019-08-01 | Agc株式会社 | ガラス、ガラスの製造方法、導電ペーストおよび太陽電池 |
| JP2021002460A (ja) * | 2019-06-21 | 2021-01-07 | 東洋アルミニウム株式会社 | 導電性ペースト及びTOPCon型太陽電池の製造方法 |
| CN114203335A (zh) * | 2021-11-30 | 2022-03-18 | 江苏正能电子科技有限公司 | 一种适用于N型TOPCon电池的正面铝浆及其制备方法 |
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- 2023-03-23 CN CN202380030117.1A patent/CN118984816A/zh active Pending
- 2023-03-23 WO PCT/JP2023/011647 patent/WO2023190084A1/ja not_active Ceased
- 2023-03-27 TW TW112111535A patent/TW202345171A/zh unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130042392A (ko) * | 2011-10-18 | 2013-04-26 | 동우 화인켐 주식회사 | 알루미늄 페이스트 조성물 및 이를 이용한 태양전지 소자 |
| JP2016213284A (ja) * | 2015-05-01 | 2016-12-15 | 東洋アルミニウム株式会社 | Perc型太陽電池用アルミニウムペースト組成物 |
| JP2019127404A (ja) * | 2018-01-23 | 2019-08-01 | Agc株式会社 | ガラス、ガラスの製造方法、導電ペーストおよび太陽電池 |
| JP2021002460A (ja) * | 2019-06-21 | 2021-01-07 | 東洋アルミニウム株式会社 | 導電性ペースト及びTOPCon型太陽電池の製造方法 |
| CN114203335A (zh) * | 2021-11-30 | 2022-03-18 | 江苏正能电子科技有限公司 | 一种适用于N型TOPCon电池的正面铝浆及其制备方法 |
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