JPWO2018221578A1 - Paste composition for solar cell - Google Patents

Abstract

The present invention provides a solar cell paste composition in which high conversion efficiency is obtained in a crystalline solar cell and the structure of the glass frit is stable and the change in viscosity (thickening) over time is suppressed. The present invention is specifically a solar cell paste composition containing aluminum powder, an organic vehicle, and a glass frit, wherein the glass frit contains 50 to 90 mol% of Sb2O3. A paste composition for use is provided.

Description

The present invention relates to a solar cell paste composition, and more particularly to a solar cell paste composition for forming a p ⁺ layer on a crystalline solar cell having a passivation film provided with an opening by using laser irradiation or the like. The present invention relates to a paste composition.

  In recent years, various research and development have been performed for the purpose of improving the conversion efficiency (power generation efficiency), reliability, and the like of crystalline solar cells. As one of them, a PERC (Passivated emitter and rear cell) type high conversion efficiency cell having a passivation film made of silicon nitride, silicon oxide, aluminum oxide, or the like on the back surface of the cell has attracted attention.

  The PERC type high conversion efficiency cell has a structure including an electrode layer containing, for example, aluminum as a main component. This electrode layer (especially the back electrode layer) is formed by applying a paste composition mainly composed of, for example, aluminum in a pattern shape so as to cover the opening of the passivation film, drying if necessary, and firing. Is done. It is known that the conversion efficiency of a PERC type high conversion efficiency cell can be improved by appropriately designing the configuration of the electrode layer.

For example, Patent Literature 1 discloses an aluminum paste composition containing a glass frit composed of 30 to 70 mol% Pb ²⁺ , 1 to 40 mol% Si ⁴⁺ , 10 to 65 mol% B ³⁺ , and 1 to 25 mol% Al ^3+. Have been. Further, Patent Document 2 relates to a paste composition containing aluminum powder, aluminum-silicon alloy powder, silicon powder, glass powder, and an organic vehicle. Pb), one selected from the group consisting of bismuth (Bi), vanadium (V), boron (B), silicon (Si), tin (Sn), phosphorus (P), and zinc (Zn), or Further, a glass powder containing lead or a lead-free glass powder such as a bismuth-based, vanadium-based, tin-phosphorus-based, zinc borosilicate-based, or alkali borosilicate-based powder may be used. Yes, it can. "(Patent Document 2, paragraph [0035], etc.).

JP 2013-145865 A JP 2013-143499 A

  However, even with the techniques disclosed in Patent Documents 1 and 2, etc., crystalline solar cells still have room for improvement in conversion efficiency. Further, in the conventional paste composition, the structure of the glass frit is not stable, the viscosity of the paste composition changes with time (particularly, the viscosity increases to 5 Pa · s or more), and the applicability (printability) of the paste composition increases. There is a problem of lowering.

  The present invention has been made in view of the above, and in a crystalline solar cell, a high conversion efficiency is obtained, the structure of a glass frit is stable, and a change in viscosity over time (thickening) is suppressed. An object is to provide a paste composition for a solar cell.

  The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a solar cell paste composition containing aluminum powder, an organic vehicle and a specific glass frit can achieve the above object, and completed the present invention. I came to.

That is, the present invention relates to the following solar cell paste composition.
1. Aluminum powder, a solar cell paste compositions containing the organic vehicle and glass frit, the glass frit is Sb ₂ O ₃ of the solar cell paste composition characterized in that it contains 50 to 90 mol%.
2. Item 2. The paste composition for a solar cell according to the above item 1, comprising 30 to 35 parts by mass of the organic vehicle and 0.5 to 5.0 parts by mass of the glass frit with respect to 100 parts by mass of the aluminum powder. .
3. _{3. The} paste composition for a solar cell according to the above item 1 or 2, wherein the glass frit further contains SiO ₂ and / or B ₂ O ₃ .

  ADVANTAGE OF THE INVENTION According to the paste composition for solar cells of this invention, while high conversion efficiency is obtained in a crystalline solar cell (especially a PERC type high conversion efficiency cell), the structure of a glass frit is stable and a viscosity change with time is obtained. (Thickening) is suppressed. The paste composition of the present invention has good applicability (printability) because the change in viscosity over time (thickening) is suppressed.

It is a schematic diagram which shows an example of the cross-section structure of a PERC type solar cell, (a) is an example of the embodiment, (b) is another example of the embodiment. It is a schematic diagram of a section of an electrode structure produced in an example and a comparative example.

  Hereinafter, the solar cell paste composition of the present invention will be described in detail. In this specification, the range indicated by “to” means “more or less” unless otherwise specified.

  The solar cell paste composition of the present invention can be used, for example, for forming an electrode of a crystalline solar cell. The crystalline solar cell is not particularly limited, and examples thereof include a PERC (Passivated emitter and rear cell) type high conversion efficiency cell (hereinafter, referred to as a “PERC solar cell”). The solar cell paste composition of the present invention can be used, for example, to form a back electrode of a PERC solar cell. Hereinafter, the paste composition of the present invention is also simply referred to as “paste composition”.

  First, an example of the structure of the PERC solar cell will be described.

1. PERC solar cell FIGS. 1A and 1B are schematic views of a general sectional structure of a PERC solar cell. The PERC solar cell includes a silicon semiconductor substrate 1, an n-type impurity layer 2, an antireflection film (passivation film) 3, a grid electrode 4, an electrode layer (backside electrode layer) 5, an alloy layer 6, and a p ⁺ layer 7. Can be provided as an element.

  The silicon semiconductor substrate 1 is not particularly limited, and for example, a p-type silicon substrate having a thickness of 180 to 250 μm is used.

  N-type impurity layer 2 is provided on the light receiving surface side of silicon semiconductor substrate 1. The thickness of the n-type impurity layer 2 is, for example, 0.3 to 0.6 μm.

  The antireflection film 3 and the grid electrode 4 are provided on the surface of the n-type impurity layer 2. The antireflection film 3 is formed of, for example, a silicon nitride film and is also called a passivation film. By acting as a so-called passivation film, the antireflection film 3 can suppress the recombination of electrons on the surface of the silicon semiconductor substrate 1, and as a result, can reduce the recombination rate of generated carriers. Thereby, the conversion efficiency of the PERC solar cell is increased.

  The antireflection film (passivation film) 3 is also provided on the back surface side of the silicon semiconductor substrate 1, that is, on the surface opposite to the light receiving surface. In addition, a contact hole (opening) penetrating the antireflection film (passivation film) 3 on the rear surface side and formed so as to cut off a part of the rear surface of the silicon semiconductor substrate 1 is formed on the rear surface of the silicon semiconductor substrate 1. Formed on the side. The method of forming the contact hole is not limited, but a method of so-called LCO (Laser contact opening) in which an opening is formed using laser irradiation or the like is generally used.

  The electrode layer 5 is formed so as to contact the silicon semiconductor substrate 1 through the contact hole. The electrode layer 5 is a member formed by the paste composition of the present invention, and is formed in a predetermined pattern shape. 1A, the electrode layer 5 may be formed so as to cover the entire back surface of the PERC solar cell, or the contact hole and the contact hole may be formed as shown in FIG. 1B. It may be formed so as to cover the vicinity thereof. Since the main component of the electrode layer 5 is aluminum, the electrode layer 5 is an aluminum electrode layer.

  The electrode layer 5 is formed, for example, by applying a paste composition in a predetermined pattern shape and firing the paste composition. The coating method is not particularly limited, and examples thereof include known methods such as screen printing. After the paste composition is applied and dried if necessary, the electrode layer 5 is formed by baking for a short time at a temperature exceeding the melting point of aluminum (about 660 ° C.), for example.

  In the present invention, the firing temperature may be any temperature higher than the melting point of aluminum (about 660 ° C), but is preferably about 750 to 950 ° C, and more preferably about 780 to 900 ° C. The firing time can be appropriately set according to the firing temperature within a range where a desired electrode layer 5 is formed.

When fired in this manner, aluminum contained in the paste composition diffuses into silicon semiconductor substrate 1. As a result, an aluminum-silicon (Al-Si) alloy layer (alloy layer 6) is formed between the electrode layer 5 and the silicon semiconductor substrate 1, and at the same time, the diffusion of aluminum atoms causes p as an impurity layer. ^{The +} layer 7 is formed.

The p ⁺ layer 7 can provide an effect of preventing recombination of electrons and improving collection efficiency of generated carriers, that is, a so-called BSF (Back Surface Field) effect.

  The electrode formed by the electrode layer 5 and the alloy layer 6 is the back electrode 8 shown in FIG. Therefore, the back surface electrode 8 is formed using a paste composition, and is coated, for example, so as to cover the contact hole 9 (opening) provided in the antireflection film (passivation film) 3 on the back surface side. The back electrode 8 can be formed by drying and baking accordingly. Here, by forming the back electrode 8 using the paste composition of the present invention, high conversion efficiency can be obtained in the solar cell. Further, since the change in viscosity (thickening) with time is suppressed in the paste composition of the present invention, the paste composition has good applicability (printability) even after a lapse of time from the preparation.

2. Paste composition paste composition of the present invention, aluminum powder, a solar cell paste compositions containing the organic vehicle and glass frit, said glass frit containing Sb ₂ O ₃ 50 to 90 mol% Features.

  As described above, the back electrode of a solar cell such as a PERC solar cell can be formed by using the paste composition. That is, the paste composition of the present invention can be used to form a back electrode for a solar cell that is in electrical contact with the silicon substrate through an opening (contact hole) provided in the passivation film formed on the silicon substrate. it can. According to the paste composition of the present invention, in a crystalline solar cell (particularly, a PERC solar cell), a high conversion efficiency is obtained, and the structure of the glass frit is stable, and the change in viscosity over time (increase in viscosity) is obtained. Viscosity) is suppressed.

The paste composition contains aluminum powder, an organic vehicle, and a glass frit as components. And since the paste composition contains aluminum powder (conductive material), the sintered body formed by firing the coating film of the paste composition exhibits conductivity to be electrically connected to the silicon substrate. .
(Aluminum powder)
The aluminum powder contained in the paste composition exhibits conductivity in an aluminum electrode layer formed by firing the paste composition. The BSF effect is obtained by forming the aluminum-silicon alloy layer 6 and the p ⁺ layer 7 between the aluminum powder and the silicon semiconductor substrate 1 when the paste composition is fired.

  The shape of the aluminum powder is not particularly limited, and may be, for example, any of a sphere, an ellipse, an irregular shape, a scale, a fiber, and the like. When the shape of the aluminum powder is spherical, the filling property of the aluminum powder in the electrode layer 5 formed of the paste composition is increased, and the electric resistance can be effectively reduced.

  When the shape of the aluminum powder is spherical, the number of contacts between the silicon semiconductor substrate 1 and the aluminum powder in the electrode layer 5 formed of the paste composition increases, so that a good BSF layer is easily formed. In the case of a spherical shape, the average particle size measured by a laser diffraction method is preferably in the range of 1 to 10 μm.

  The aluminum powder may be composed of only high-purity aluminum or may contain an aluminum alloy. For example, examples of the aluminum alloy include an aluminum-silicon alloy and an aluminum-boron alloy.

  In the present invention, the aluminum powder preferably contains an aluminum-silicon alloy, and the silicon content in the aluminum powder is preferably 10 to 25 atomic%. More preferably, the silicon content is between 15 and 22 atomic%. By using such aluminum powder, the adhesion to the silicon semiconductor substrate 1 is further improved.

In both cases where the aluminum powder is composed only of high-purity aluminum and an aluminum alloy, the presence of unavoidable impurities and trace amounts of additional elements derived from the raw materials are not excluded.
(Organic vehicle)
As the organic vehicle, a material in which various additives and a resin are dissolved in a solvent as necessary can be used. Alternatively, the resin itself may be used as an organic vehicle without containing a solvent.

  Known types of solvents can be used, and specific examples thereof include diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, and dipropylene glycol monomethyl ether.

  As the various additives, for example, an antioxidant, a corrosion inhibitor, an antifoaming agent, a thickener, a tack fire, a coupling agent, an electrostatic imparting agent, a polymerization inhibitor, a thixotropic agent, an anti-settling agent and the like are used. be able to. Specifically, for example, polyethylene glycol ester compound, polyethylene glycol ether compound, polyoxyethylene sorbitan ester compound, sorbitan alkyl ester compound, aliphatic polycarboxylic acid compound, phosphate ester compound, amide amine salt of polyester acid, polyethylene oxide A series compound, a fatty acid amide wax and the like can be used.

  Known types of resins can be used, and ethyl cellulose, nitrocellulose, polyvinyl butyral, phenol resin, melanin resin, urea resin, xylene resin, alkyd resin, unsaturated polyester resin, acrylic resin, polyimide resin, furan resin, Urethane resin, isocyanate compound, thermosetting resin such as cyanate compound, polyethylene, polypropylene, polystyrene, ABS resin, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyacetal, polycarbonate, polyethylene terephthalate, Polybutylene terephthalate, polyphenylene oxide, polysulfone, polyimide, polyethersulfone, polyarylate, polyetherether ketone Emissions, polytetrafluoroethylene, can be used in combination of two or more kinds of such as silicon resin.

  The proportions of the resin, solvent, and various additives contained in the organic vehicle can be arbitrarily adjusted. For example, the component ratios can be the same as those of known organic vehicles.

The content of the organic vehicle is not particularly limited. For example, from the viewpoint of having good printability, it is preferably 20 to 45 parts by mass, and more preferably 30 to 35 parts by mass with respect to 100 parts by mass of the aluminum powder. Is particularly preferred.
(Glass frit)
The glass frit is said to have an effect of assisting the reaction between the aluminum powder and silicon and the sintering of the aluminum powder itself.

In the paste composition of the present invention, the glass frit (100 mol%) containing _Sb 2 _{O 3} 50 to 90 mol%. Since such a glass frit suppresses a change in viscosity (thickening) of the paste composition over time, the paste composition has good applicability (printability) even after a lapse of time from the preparation. Sb ₂ O ₃ content in the glass frit may be a 50 to 90 mole percent, 52 to 70 mol% among their structure of the glass frit are particularly stable, and temporal change in viscosity (thickening ) Is preferred because it is suppressed. When the Sb ₂ O ₃ content is less than 50 mol%, the conversion efficiency (Eff) of the solar battery cell is low, and the viscosity of the paste composition may be increased to 5 Pa · s or more over time. On the other hand, if the Sb ₂ O ₃ content exceeds 90 mol%, vitrification becomes difficult, and there is a possibility that it cannot be used as an electrode material. When the Sb ₂ O ₃ content is more than 70 mol% and not more than 90 mol%, it can be used as an electrode material, but the structure of the glass frit depends on the temperature and pressure or the manufacturing conditions of the glass frit. It may decrease within the allowable range of use.

It is preferable that the glass frit further contains SiO ₂ and / or B ₂ O ₃ as a balance excluding Sb ₂ O ₃ . 2 component as a glass frit _Sb 2 _O 3 _-B 2 _{O 3,} or _Sb 2 _O 3 _-B 2 _O 3 but it is preferably composed from any of the three components of -SiO _2, the effect of the present invention It is permissible to further contain other components in a range that does not affect the above. Although sb ₂ O ₃ content of components other than is not _limited, the content of B 2 _{O 3} is preferably from 30 to 40 mol%, more preferably 30 to 36 mol%. The content of SiO ₂ is preferably from 0 to 14 mol%, more preferably from 0 to 5 mol%. The lower limit of the content when adding SiO ₂ is preferably 1 mol%.

  The content of the glass frit is not particularly limited, but is preferably, for example, 0.5 to 5.0 parts by mass with respect to 100 parts by mass of the aluminum powder. In this case, the adhesion between the silicon semiconductor substrate 1 and the antireflection film 3 (passivation film) is improved, and the electric resistance is hardly increased.

  As described above, the paste composition of the present invention is particularly preferably a composition containing 30 to 35 parts by mass of an organic vehicle and 0.5 to 5.0 parts by mass of a glass frit with respect to 100 parts by mass of aluminum powder. . By setting the content in such a range, high conversion efficiency is obtained, and the structure of the glass frit is stable, and a change in viscosity (thickening) with time is suppressed.

  The paste composition of the present invention is suitable for use, for example, for forming an electrode layer of a solar cell (particularly, a back electrode 8 of a PERC-type solar cell as shown in FIG. 1). Therefore, the paste composition of the present invention can also be used as a solar cell back electrode forming agent.

  Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples. However, the present invention is not limited to the embodiments.

Example 1
(Preparation of paste composition)
100 parts by mass of aluminum powder having a D _{50 of} 4.0 μm produced by a gas atomization method and 1.5 parts by mass of a glass frit of Sb ₂ O ₃ —B ₂ O ₃ (70 mol% -30 mol%) were mixed with ethyl cellulose. It was made into a paste using a dispersing device (disper) at 35 parts by mass of the resin solution dissolved in butyl diglycol. Thus, a paste composition was obtained.
(Preparation of fired substrate as solar cell)
A fired substrate as a solar cell for evaluation was prepared as follows.

  First, as shown in FIG. 2A, a silicon semiconductor substrate 1 (including a passivation film on the back surface side) having a thickness of 180 μm was prepared. Then, as shown in FIG. 2B, a contact hole 9 having a width D of 50 μm and a depth of 1 μm was formed on the back surface of the silicon semiconductor substrate 1 using a YAG laser having a wavelength of 532 nm as a laser oscillator. This silicon semiconductor substrate 1 had a resistance value of 3 Ω · cm and was a back surface passivation type single crystal.

  In FIG. 2, the passivation film is not shown and is treated as included in the silicon semiconductor substrate 1. The passivation film is formed by stacking a 30 nm aluminum oxide layer and a 100 nm silicon nitride layer on the back surface of the silicon semiconductor substrate 1. Included as body.

  Next, as shown in FIG. 2C, the paste composition 10 obtained above is applied to the surface of the silicon semiconductor substrate 1 so as to cover the entire back surface (the surface on the side where the contact holes 9 are formed). Using a screen printer, printing was performed on the upper surface so as to be 1.0 to 1.1 g / pc. Next, although not shown, an Ag paste prepared by a known technique was printed on the light receiving surface.

Thereafter, firing was performed using an infrared belt furnace set at 800 ° C. By this baking, as shown in FIG. 2D, an electrode layer 5 is formed, and at the time of this baking, aluminum diffuses into the silicon semiconductor substrate 1 to form the electrode layer 5 and the silicon semiconductor substrate. At the same time, an Al ⁺ Si alloy layer 6 was formed, and at the same time, ap ⁺ layer (BSF layer) 7 was formed as an impurity layer by diffusion of aluminum atoms. Thus, a fired substrate for evaluation was manufactured.
(Evaluation of solar cells)
In the evaluation of the obtained solar cell, IV measurement was performed using a Wacom Denso's solar simulator: WXS-156S-10 and an IV measurement device: IV15040-10. Those with an Eff of 19.0% or more were regarded as acceptable.
(Evaluation of time-dependent change in viscosity of paste composition)
The prepared paste composition was left in an oven at 50 ° C. for one week, and a change in viscosity before and after the test was measured by a viscometer. As a viscometer, a cone plate type viscometer DV2T manufactured by Brookfield was used, and the measurement was performed in accordance with JIS K5600 2.3 cone plate viscometer method. Those having a viscosity change of less than 5 Pa · s before and after the test were regarded as acceptable.
(Evaluation of adhesion of electrode layer 5 (aluminum electrode))
For the evaluation of the adhesion of the electrode layer 5 (aluminum electrode), a mending tape (12 mm wide, manufactured by 3M Company) was applied to the surface of the electrode layer 5 (aluminum electrode) formed on the back surface of the silicon semiconductor substrate 1 for 3 cm in length. After bonding, the tape was vigorously peeled off at an angle of 45 degrees with respect to the silicon semiconductor substrate 1, and the ratio of the total area of the portion to which aluminum was adhered to the area of the original mending tape was binarized. The evaluation was performed by calculating using possible analysis software. The evaluation of the adhesion was performed by the same person at the same posture, angle, force, and constant speed. A sample having no aluminum adhered to the mending tape was evaluated as ○, and a sample slightly adhered to aluminum was evaluated as ×.

Example 2
Except for using a glass frit 1.5 parts by weight of _{Sb 2 O 3 -B 2 O 3} (65 mol% -35 mol%) in the same manner as in Example 1 to prepare a paste composition was evaluated.

Example 3
Except for using a glass frit 1.5 parts by weight of _{Sb 2 O 3 -B 2 O 3} (60 mol% -40 mol%) in the same manner as in Example 1 to prepare a paste composition was evaluated.

Example 4
Except for using _{Sb 2 O 3 -B 2 O 3} -SiO 2 glass frit 1.5 parts by weight of (55 mol% -35 mol% -10 mol%) in the same manner as in Example 1 prepare a paste composition And evaluated.

Example 5
Sb ₂ O ₃ -B ₂ O ₃ except for using a glass frit 1.5 parts by weight of -SiO ₂ (52 mol% -34 mol% -14 mol%) in the same manner as in Example 1 prepare a paste composition And evaluated.

Example 6
Sb ₂ O ₃ -B ₂ O ₃ except for using a glass frit 0.5 part by weight of -SiO ₂ (52 mol% -34 mol% -14 mol%) in the same manner as in Example 1 prepare a paste composition And evaluated.

Example 7
Except for using a glass frit 5.0 parts by weight _{Sb 2 O 3 -B 2 O 3} -SiO 2 (52 mol% -34 mol% -14 mol%) in the same manner as in Example 1 prepare a paste composition And evaluated.

Comparative Example 1
Example 1 except that 1.5 parts by mass of a glass frit of B ₂ O ₃ —SiO ₂ —BaO—CaO—ZnO (35 mol% -10 mol% -35 mol% -10 mol% -10 mol%) was used. A paste composition was prepared and evaluated in the same manner as described above.

Comparative Example 2
Sb ₂ O ₃ (100 mol%) could not be vitrified. That is, a paste composition was prepared and evaluated in the same manner as in Example 1 except that 1.5 parts by mass of a frit of Sb ₂ O ₃ (100 mol%) that was not vitrified was used.

Comparative Example 3
Glass frit _{Sb 2 O 3 -B 2 O 3} (46 mol% -54 mol%), hygroscopic, deliquescent and water was not used as an electrode material for incorporation in addition to the paste.

Comparative Example 4
_{B 2 O 3 -BaO-CaO-} ZnO except for using a glass frit 1.5 parts by weight in the same manner as in Example 1 paste composition (27 mol% -45 mol% -10 mol% -18 mol%) Was prepared and evaluated.

Comparative Example 5
Except for using the _{SiO 2 -Al 2 O 3 -B 2} O 3 -PbO glass frit 1.5 parts by weight of (1 mol% -4 mol% -30 mol% -65 mol% -10 mol%) Example A paste composition was prepared and evaluated in the same manner as in Example 1.

Comparative Example 6
A paste composition was prepared in the same manner as in Example 1 except that 0.4 parts by mass of a glass frit of Sb ₂ O ₃ —B ₂ O ₃ —SiO ₂ (52 mol% -34 mol% -14 mol%) was used. And evaluated.

Comparative Example 7
A paste composition was prepared in the same manner as in Example 1, except that 6.0 parts by mass of a glass frit of Sb ₂ O ₃ —B ₂ O ₃ —SiO ₂ (52 mol% -34 mol% -14 mol%) was used. And evaluated.

  Table 1 below shows the conditions and evaluation results of each example and comparative example.

From the results in Table 1, it can be seen that when the paste compositions of Examples 1 to 7 using the predetermined glass frit of the present invention were used, high conversion efficiency was obtained, and the structure of the glass frit was stable and time-dependent. It can be seen that the change in viscosity (thickening) is suppressed. On the other hand, when the paste compositions of Comparative Examples 1 to 7 which do not use the predetermined glass frit of the present invention are used, they are inferior to the paste compositions of Examples 1 to 7 in conversion efficiency and / or change in paste viscosity. I understand. In particular, in Comparative Example 2 in which the Sb ₂ O ₃ content exceeded 90 mol%, Sb ₂ O ₃ was not vitrified and could not be used as an electrode material. In Comparative Example 6 in which the glass frit addition amount was 0.4 parts by mass, the conversion efficiency was lower than 19.0%. In Comparative Example 7 in which the glass frit addition amount was 6.0% by mass, the electrode layer 5 (the aluminum electrode) was used. ) Was inferior in adhesion.

1: silicon semiconductor substrate 2: n-type impurity layer 3: antireflection film (passivation film)
4: grid electrode 5: electrode layer 6: alloy layer 7: p + layer 8: back electrode 9: contact hole (opening)
10: Paste composition

Claims (3)

Aluminum powder, a solar cell paste compositions containing the organic vehicle and glass frit, the glass frit is Sb ₂ O ₃ of the solar cell paste composition characterized in that it contains 50 to 90 mol%.   The paste composition for a solar cell according to claim 1, comprising 30 to 35 parts by mass of the organic vehicle and 0.5 to 5.0 parts by mass of the glass frit with respect to 100 parts by mass of the aluminum powder. . _{3. The} paste composition for a solar cell according to claim 1, wherein the glass frit further contains SiO ₂ and / or B ₂ O _3. 4.

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