KR102007860B1 - Electrode Paste For Solar Cell's Electrode And Solar Cell using the same - Google Patents

Abstract

The present invention relates to a conductive paste for a solar cell electrode, comprising a metal powder, a glass frit, and an organic vehicle, wherein the surface of the glass frit is coated with an aliphatic amine compound. By coating the surface of the glass frit with an aliphatic amine compound to improve dispersibility, the electrical characteristics of the solar cell electrode formed using the same may be improved to improve the power generation efficiency of the solar cell.

Description

Conductive paste for solar cell electrode and solar cell manufactured using same {Electrode Paste For Solar Cell's Electrode And Solar Cell using the same}

The present invention relates to a conductive paste used for forming an electrode of a solar cell and a solar cell manufactured using the same.

A solar cell is a semiconductor device that converts solar energy into electrical energy and generally has a p-n junction. The basic structure is the same as that of a diode. 1 is a structure of a general solar cell device, and the solar cell device is generally configured using a p-type silicon semiconductor substrate 10 having a thickness of 180 to 250 μm. On the light-receiving surface side of the silicon semiconductor substrate, an n-type impurity layer 20 having a thickness of 0.3 to 0.6 µm, an antireflection film 30 and a front electrode 100 are formed thereon. In addition, the back electrode 50 is formed on the back side of the p-type silicon semiconductor substrate.

The front electrode 100 is formed by applying a conductive paste mixed with silver-based conductive particles (silver powder), glass frit, organic vehicle, and additives on the anti-reflection film 30. After baking, the electrode is formed, and the back electrode 50 is coated with an aluminum paste composition composed of aluminum powder, glass frit, organic vehicle, and additives by screen printing and dried, and then dried at a temperature of 660 ° C. (melting point of aluminum) or more. It is formed by baking. During the firing, aluminum diffuses into the p-type silicon semiconductor substrate, whereby an Al-Si alloy layer is formed between the back electrode and the p-type silicon semiconductor substrate, and the p + layer 40 is formed as an impurity layer by diffusion of aluminum atoms. ) Is formed. The presence of such a p + layer results in a back surface field (BSF) effect that prevents electron recombination and improves the collection efficiency of product carriers. The rear silver electrode 60 may be further positioned below the rear aluminum electrode 50.

Glass frits, on the other hand, are essential for the Ag / Si contact of silicon solar cells. Due to the high efficiency of solar cells, the use of glass frits with excellent contact resistance (Rc) is inevitable. In the related art, although the etching of the antireflection film is controlled by adjusting the component system, particle size, or content of the glass frit, many problems are caused in the dispersion of the glass frit. In addition, when the image is observed after sintering, the thickness of the glass layer is not uniform, causing damage to the n layer in a thick region, and a decrease in the penetration of silver powder in a thin region, which causes a problem of decreasing current or increasing resistance.

United States Patent 8,748,327 B1 (2014.06.10.) WO Patent Publication 2013/105812 A1 (2013.07.18.) United States Patent Application Publication No. 2011-0094578 A1 (2011.04.28.)

The present invention is to improve the dispersibility by coating the surface of the glass frit with the aliphatic amine compound in the composition of the conductive paste for solar cell electrode, thereby improving the electrical characteristics of the solar cell electrode formed using this to improve the power generation efficiency of the solar cell For the purpose of

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention provides a conductive paste for a solar cell electrode comprising a metal powder, a glass frit, and an organic vehicle, wherein the surface of the glass frit is coated with an aliphatic amine compound.

In addition, the aliphatic amine compound is characterized in that it comprises an alkylamine-based material having 6 to 24 carbon atoms.

In addition, the alkylamine-based material is triethylamine (Triethylamine), heptylamine (Heptylamine), octadecylamine (Octadecylamine), hexadecylamine (Hexadecylamine), decylamine (Decylamine), octylamine (Octylamine), diddecylamine ( Didecylamine), or trioctylamine (Trioctylamine) is characterized in that it comprises.

In addition, the coating layer formed by coating with the aliphatic amine compound is characterized in that the thickness of 0.1nm to 50nm.

In addition, the glass frit is a first glass frit, the conductive paste further comprises a second glass frit, the surface of the second glass frit is characterized in that the coating is not coated or coated with fatty acids.

In addition, the fatty acid is characterized in that it comprises lauric acid, oleic acid, stearic acid, palmitic acid or acetic acid.

In another aspect, the present invention provides a solar cell having a front electrode on an upper substrate and a back electrode on a lower substrate, wherein the front electrode is manufactured by applying a conductive paste for the solar cell electrode and then drying and firing the same. It provides a solar cell.

The conductive paste according to the present invention may include a glass frit coated with an aliphatic amine compound to improve dispersibility, thereby enabling uniform application of the glass frit during electrode formation. Accordingly, the reactivity during firing is excellent, in particular, it is possible to minimize the damage of the n layer at a high temperature, it is possible to improve the adhesion and excellent open voltage. In addition, the penetration of the metal powder (eg, silver powder) may be uniform during firing to reduce the contact resistance between the electrode and the n layer. As a result, the electrical characteristics of the solar cell electrode may be improved, and thus the power generation efficiency of the solar cell may be improved.

1 is a schematic cross-sectional view of a general solar cell device.
FIG. 2 is for evaluating the dispersibility of the glass frit and is an image photographing the state immediately after the glass frit is put into water and stirred and left for 24 hours.
3A and 3B show the results of thermogravimetric analysis on the surface-coated glass frits and the uncoated glass frit prepared according to Preparation Examples 1 to 6.
4A and 4B show the results of DSC analysis on the surface coated glass frits and the uncoated glass frit prepared according to Preparation Examples 1-6.
Figure 5 shows the results of the adhesion measurement between the ribbon and the solar cell electrode prepared using the conductive paste prepared according to Examples 1, 4 and Comparative Example 1.
6a to 6c are surface images of the electrode taken after the conductor ribbon is detached.

Prior to describing the present invention in detail below, it is understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention, which is limited only by the scope of the appended claims. shall. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise indicated.

Throughout this specification and claims, unless otherwise indicated, the termcomprise, constitutes, and configure means to include the referenced article, step, or group of articles, and step, and any other article It is not intended to exclude a stage or group of things or groups of stages.

On the other hand, various embodiments of the present invention can be combined with any other embodiment unless clearly indicated to the contrary. Any feature indicated as particularly preferred or advantageous may be combined with any other feature and features indicated as preferred or advantageous. Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention and the effects thereof.

The paste according to one embodiment of the present invention is a paste suitable for use in forming a solar cell electrode, and provides a conductive paste including a glass frit coated with an aliphatic amine compound. More specifically, the conductive paste according to the present invention comprises a metal powder, a glass frit, an organic vehicle and other additives.

Silver powder, copper powder, nickel powder, aluminum powder, etc. may be used as the metal powder. For the front electrode, silver powder is mainly used, and for the back electrode, aluminum powder is mainly used. The metal powder may be one of the above-mentioned powders alone, an alloy of the above-described metals, or a mixed powder of at least two of the above-mentioned powders.

The content of the metal powder is preferably 40 to 95% by weight based on the total weight of the conductive paste composition in consideration of the electrode thickness formed during printing and the wire resistance of the electrode. If less than 40% by weight may be a high specific resistance of the electrode formed, when more than 95% by weight there is a problem that the metal powder is not uniformly dispersed due to insufficient content of other components. More preferably included in 70 to 90% by weight.

In the case where the conductive paste contains silver powder for forming the front electrode of the solar cell, the silver powder is preferably pure silver powder. In addition, a silver-coated composite powder having at least a surface of a silver layer or an alloy containing silver as a main component alloys may be used. In addition, other metal powders may be mixed and used. For example, aluminum, gold, palladium, copper, nickel, etc. are mentioned.

The average particle diameter (D50) of the metal powder may be 0.1 to 10 μm, and 0.5 to 5 μm is preferable in consideration of the ease of pasting and the density at the time of baking, and the shape is at least 1 of spherical, needle, plate and amorphous. It may be more than one species. The metal powder may be used by mixing two or more kinds of powders having different average particle diameters, particle size distributions, shapes, and the like.

The glass frit may be coated with an aliphatic amine compound to improve dispersibility. Preferably, the aliphatic amine compound may include an alkylamine-based material having 6 to 24 carbon atoms. More preferably, the surface of the glass frit may be coated with an alkylamine-based material having 10 to 20 carbon atoms. For example, the alkylamine-based material may be triethylamine, heptylamine, octadecylamine, octadecylamine, hexadecylamine, decylamine, octylamine, octylamine, didideamine. Didecylamine, or trioctylamine may be included.

The aliphatic amine compound is preferably coated with a thickness of 0.5nm to 50nm on the surface of the glass frit. Coating of the aliphatic amine compound may be performed by adding a glass frit to an organic solvent or an aqueous solution in which the aliphatic amine compound is dissolved, stirring the mixture for a predetermined time, and then filtering. When the thickness of the coating layer formed by coating the aliphatic amine compound is less than 0.5 nm, the effect of improving the dispersibility of the glass frit is reduced, and when the thickness of the coating layer is greater than 50 nm, the electrode of the solar cell formed of the conductive paste including the same. Electrical characteristics may be degraded. The thickness of the coating layer may be controlled through the content of the aliphatic amine compound used in the coating treatment.

There is no restriction | limiting in particular in the composition, particle diameter, and shape of the said glass frit. Lead-free glass frits can be used as well as leaded glass frits. Preferably, as a component and content of the glass frit, PbO is 5 to 29 mol%, TeO ₂ is 20 to 34 mol%, Bi ₂ O ₃ is 3 to 20 mol%, SiO _{2 is} 20 mol% or less, 10 mol% or less of B ₂ O ₃ , alkali metals (Li, Na, K, etc.) and alkaline earth metals (Ca, Mg, etc.) may contain 10 to 20 mol%. By combining the organic content of the above components, it is possible to prevent the increase of the electrode line width, to improve the contact resistance at the sheet resistance, and to improve the short circuit current characteristics.

The average particle diameter of the glass frit is not limited, but may have a particle diameter within the range of 0.5 to 10 μm, and may be used by mixing multi-sheet particles having different average particle diameters. Preferably, at least 1 type of glass frit uses that whose average particle diameter (D50) is 2 micrometers or more and 10 micrometers or less.

The content of the glass frit is preferably 1 to 10% by weight based on the total weight of the conductive paste composition. If the content is less than 1% by weight, incomplete firing may occur to increase the electrical resistivity. There are too many components, and there exists a possibility that an electrical resistivity may also become high.

As described above, as the surface of the glass frit is coated with the aliphatic amine compound, dispersibility may be improved, so that uniform application of the glass frit may be possible at the time of forming the electrode. As a result, the reactivity during firing becomes excellent, in particular, it is possible to minimize the damage of the n-layer at high temperatures, the adhesion is improved and the open-circuit (Voc) can be excellent. In addition, the penetration of the metal powder (eg, silver powder) may be uniform during firing to reduce the contact resistance between the electrode and the n layer. Providing such effects can provide additional effects that make it easier to control the composition, particle diameter or shape of the glass frit.

As another embodiment of the present invention, the glass frit may include a first glass frit coated with an alkylamine-based material having 6 to 24 carbon atoms, and a second glass frit coated with a fatty acid. Each of the first glass frit and the second glass frit may comprise the above-mentioned leaded glass frit or lead-free glass frit. In addition, the alkylamine-based materials include triethylamine, heptylamine, octadecylamine, octadecylamine, hexadecylamine, decylamine, octylamine, octylamine, and didecylamine. ), Or trioctylamine, and the fatty acid may comprise lauric acid, oleic acid, stearic acid, palmitic acid or acetic acid. As the glass frit is used by mixing the first glass frit and the second glass frit coated with different materials, the dispersibility of the glass frit in the conductive paste can be variously controlled.

In another embodiment of the present invention, the first glass frit may be a glass frit coated with the alkylamine-based material, and the second glass frit may be an uncoated glass frit.

The organic vehicle is not limited, but an organic binder and a solvent may be included. Sometimes the solvent can be omitted. The organic vehicle is not limited but is preferably 1 to 30% by weight based on the total weight of the conductive paste composition.

The organic vehicle is required to maintain a uniformly mixed state of the metal powder and the glass frit. For example, when the conductive paste is applied to the substrate by screen printing, the conductive paste is made homogeneous and the print pattern is blurred. And properties for suppressing flow and improving the dischargeability and plate separation property of the conductive paste from the screen plate.

The organic binder included in the organic vehicle is not limited, but examples of the cellulose ester-based compound include cellulose acetate, cellulose acetate butylate, and the like, and cellulose ether compounds include ethyl cellulose, methyl cellulose, hydroxy flophyll cellulose, and hydroxy ethyl. Cellulose, hydroxy propyl methyl cellulose, hydroxy ethyl methyl cellulose, and the like. Examples of the acryl-based compound include poly acrylamide, poly methacrylate, poly methyl methacrylate, and poly ethyl methacrylate. Examples of the vinyl type include polyvinyl butyral, polyvinyl acetate, and polyvinyl alcohol. At least one organic binder may be selected and used.

Solvents used for dilution of the composition include alpha-terpineol, texanol, dioctyl phthalate, dibutyl phthalate, cyclohexane, hexane, toluene, benzyl alcohol, dioxane, diethylene glycol, ethylene glycol mono butyl ether, ethylene At least one compound selected from the group consisting of glycol mono butyl ether acetate, diethylene glycol mono butyl ether, diethylene glycol mono butyl ether acetate and the like is preferably used.

The conductive paste composition according to the present invention may further include additives commonly known as necessary, for example, a dispersant, a plasticizer, a viscosity modifier, a surfactant, an oxidant, a metal oxide, a metal organic compound, and the like.

The above-mentioned conductive paste composition for solar cell electrodes may be prepared by mixing and dispersing metal powder, coated glass frit, organic vehicle and additives, and then filtering and defoaming.

The present invention also provides a method for forming an electrode of a solar cell and a solar cell electrode produced by the method, wherein the conductive paste is coated on a substrate, dried and baked. Except for using a conductive paste containing a glass frit coated as described above in the method of forming a solar cell electrode of the present invention, the substrate, printing, drying and firing can be used the methods commonly used in the manufacture of solar cells Of course. For example, the substrate may be a silicon wafer.

On the other hand, since the unit photovoltaic cell including the solar cell electrode formed as described above is small in electromotive force, a plurality of unit photovoltaic cells are connected to form a photovoltaic module having a suitable electromotive force. Each unit solar cell is then connected by a length of conductor ribbon coated with lead.

In addition, the conductive paste according to the present invention has a structure such as crystalline solar cells (P-type, N-type), PSC (Passivated Emitter Solar Cell), PERC (Passivated Emitter and Rear Cell), PERL (Passivated Emitter Real Locally Diffused) It can be applied to all of the changed printing processes such as double printing and dual printing.

Preparation Example 1

Pb-Te-Bi type glass frit was added to a 0.3% organic solution prepared by dissolving octadecylamine (ODA) in ethanol, and then proceeded to a ball mill at 80 rpm for 24 hours. Then, drying was performed for 1 hour in an oven at 50 ° C. to obtain a glass frit coated with octadecylamine.

Preparation Example 2

In Preparation Example 1, except that Duomeen TDO (common name: N- (Tallow alkyl) -1,3-propanediamine oleates) was dissolved in ethanol to prepare an organic solution having a concentration of 0.3%, the same method as Preparation Example 1 To give a glass frit coated with TDO.

Preparation Example 3

In Preparation Example 1, stearic acid was dissolved in ethanol to prepare a glass frit coated with stearic acid in the same manner as in Preparation Example 1 except that 0.3% concentration of an organic solution was prepared.

Preparation Example 4

In Preparation Example 1, a glass frit coated with oleic acid was obtained in the same manner as in Preparation Example 1, except that an oleic acid was dissolved in ethanol to prepare an organic solution having a concentration of 0.3%.

Preparation Example 5

In Preparation Example 1, a glass frit coated with octadecylamine was obtained in the same manner as in Preparation Example 1, except that the octadecylamine was dissolved in ethanol to prepare an organic solution having a concentration of 0.1%.

Preparation Example 6

In Preparation Example 1, a glass frit coated with octadecylamine was obtained in the same manner as in Preparation Example 1, except that the octadecylamine was dissolved in ethanol to prepare an organic solution having a concentration of 0.5%.

Examples and Comparative Examples

To the composition as shown in Table 1 (for example, by weight%), the coated glass frit, the organic binder, the solvent and the dispersant were added and dispersed using a mixing mixer, and then silver powder (spherical, average particle diameter 1㎛) The mixture was also dispersed using a sambon mill. After that, degassed under reduced pressure to prepare a conductive paste. Examples 1 to 6 used glass frits obtained according to Preparation Examples 1 to 6, respectively, and Comparative Example 1 used glass frits of Pb-Te-Bi type which were not coated.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Silver powder 88 88 88 88 88 88 88 bookbinder 0.4 0.4 0.4 0.4 0.4 0.4 0.4 menstruum
(texanol) 6 6 6 6 6 6 6 Dispersant 3.6 3.6 3.6 3.6 3.6 3.6 3.6 Glass frit





Preparation Example 1 2 Preparation Example 2 2 Preparation Example 3 2 Preparation Example 4 2 Preparation Example 5 2 Preparation Example 6 2 No coating 2

Experimental Example

(1) Evaluation of coating property of glass frit

Surface-coated glass frits and non-coated glass frits prepared according to Preparation Examples 1 to 6 were placed in water, stirred and left to compare and evaluate coating properties. The comparative evaluation of the coating property was performed by observing the coating property by visually leaving the solution to which the glass frit was added for 24 hours after stirring. FIG. 2 is for evaluating the coating property of the glass frit, and is an image photographing a state immediately after the glass frit is put into water and stirred and left for 24 hours. Referring to FIG. 2, it is confirmed that the glass frits coated with the aliphatic amine compound (Preparation Examples 1, 2, 5 and 6) and the glass frits coated with fatty acids (Preparation Examples 3 and 4) are well coated. At this time, the glass frits coated with the aliphatic amine compound (Preparation Examples 1, 5 and 6) have improved dispersibility and are bulkier than those of the uncoated glass frit, while the glass frits coated with fatty acid (Preparation Example 3 And 4) it can be seen that a large amount of aggregation occurs.

(2) Thermogravimetric analysis (TGA)

Thermogravimetric analysis was performed on the surface coated glass frits and the uncoated glass frits prepared according to Preparation Examples 1 to 6 above. 3A and 3B show the results of thermogravimetric analysis on the surface-coated glass frits and the uncoated glass frit prepared according to Preparation Examples 1 to 6. Referring to Figure 3a, it can be seen that when coated with a fatty acid, the evaporation time of the coating material is longer than when coated with an aliphatic amine compound. Referring to Figure 3b, it is confirmed that the weight reduction width of the aliphatic amine compound (that is, octadecylamine) increases depending on the content, it can be seen that uniform coating through this.

(3) DSC analysis

DSC analyzes were performed on the surface coated glass frits and the uncoated glass frits prepared according to Preparation Examples 1-6 above. 4A and 4B show the results of DSC analysis on the surface coated glass frits and the uncoated glass frit prepared according to Preparation Examples 1-6. 4A and 4B, the surface-coated glass frits prepared according to Preparation Examples 1 to 6 exhibit exothermic reactions in the same manner as the uncoated glass frit, but in the case of Preparation Example 6, the crystallization of glass was changed. It can be seen that.

(4) Conversion efficiency and resistance measurement

The conductive paste prepared according to Examples 1 to 6 and Comparative Example 1 was pattern printed on the front surface of the wafer by a screen printing technique of 40 μm mesh, and the belt-type drying furnace was used for 20 to 30 seconds at 200 to 350 ° C. Dried. After printing the Al paste on the back of the wafer and dried in the same way. The cell formed by the above process was calcined for 20 seconds to 30 seconds between 500 to 900 ° C. using a belt type kiln to manufacture solar cells.

The manufactured cell is a solar cell efficiency measurement equipment (Halm, cetisPV-Celltest 3), using a short circuit current (Isc), open voltage (Voc), conversion efficiency (Eff), curve factor (FF), series resistance ( Rs) and line resistance (Rline) were measured and shown in Table 2 below.

division Isc
(A) Voc
(V) Eff
(%) FF
(%) Rs
(mΩ) Rline-1
(Ω) Rline-2
(Ω) Comparative Example 1 9.1223 0.6315 18.86 79.31 0.001229 24.30 24.57 Example 1 9.1215 0.6323 18.89 79.231 0.001160 24.53 24.53 Example 2 9.1161 0.6320 18.87 79.30 0.001162 24.73 24.85 Example 3 9.1310 0.6306 18.82 79.18 0.001210 24.80 24.20 Example 4 9.1148 0.6307 18.83 79.32 0.001241 23.84 24.69 Example 5 9.1464 0.6318 18.92 79.32 0.001176 24.00 23.82 Example 6 9.1184 0.6313 18.85 79.32 0.001213 24.52 24.56

As shown in Table 2, in the case of a solar cell including an electrode made of a conductive paste (eg, Examples 1, 2, and 5) including a glass frit coated with a fatty acid amine compound, It can be seen that the open circuit voltage is increased and the series resistance is reduced compared to the solar cell including the electrode made of the conductive paste (Comparative Examples 1 or 3 and 4) containing the glass frit coated with fatty acid, and also the conversion It can be seen that the efficiency of the solar cell is improved due to its high efficiency.

In addition, when comparing the case according to Examples 1, 5 and 6, it can be seen that the conversion efficiency is greatly increased when the surface of the glass frit is coated with a small amount (Example 5). Through this, it can be seen that the dispersibility of the glass frit and the electrical characteristics of the solar cell electrode vary depending on the content of the aliphatic amine compound used in the coating process (in other words, the thickness of the coating layer).

(5) adhesion evaluation 1

After manufacturing solar cells using the conductive pastes prepared according to Examples 1, 4 and Comparative Example 1 in the same manner as described above, a conductor ribbon (ribbon) through a tabbing process on the electrode of each cell Was attached. The ribbon used was a product of 60Sn40Pb (kosbon Co., Ltd.), and adhesion was performed at 350 ° C using a soldering iron. Then, the adhesive force between the solar cell electrode and the ribbon was measured. The adhesive force measuring device was manufactured by LS1 (Lloyd), and the adhesive force measurement was performed at a speed of 250 mm / min in a 180 degree direction. Figure 5 shows the results of the adhesion measurement between the ribbon and the solar cell electrode prepared using the conductive paste prepared according to Examples 1, 4 and Comparative Example 1. Referring to FIG. 5, the glass frit coated with a fatty acid amine compound (eg octadecylamine) (Preparation Example 1) has a uniform adhesion, while the glass frit coated with fatty acid (eg oleic acid) (Preparation Example 4) It can be seen that the adhesion is uneven. Through this, it is possible to infer that the glass frit coated with the aliphatic amine compound is improved in dispersibility, while the glass frit coated with fatty acid is inferior in dispersibility.

(6) adhesion evaluation 2

After manufacturing solar cells in the same manner as described above using the conductive paste prepared according to Examples 1, 4 and Comparative Example 1, the conductor ribbon was applied to the electrodes of the cells through the above-described tabbing process. Attached. Thereafter, the conductor ribbon was detached and the interface images were measured. 6a to 6c are surface images of the electrode photographed after the detachment of the conductor ribbon. 6A to 6C, it can be seen that the electrode made of the conductive paste of Example 1 has a more uniform interface after ribbon detachment than that of the electrode made of the conductive paste of Comparative Examples 1 and 4. Through this, it is possible to infer that the glass frit coated with the aliphatic amine compound is improved in dispersibility while the glass frit coated with fatty acid is inferior in dispersibility.

Features, structures, effects, and the like illustrated in the above-described embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

10: P-type silicon semiconductor substrate
20: N-type impurity layer
30: antireflection film
40: P + layer (BSF: back surface field)
50: back aluminum electrode
60: back silver electrode
100: front electrode

Claims (7)

Metal powder, glass frit, and organic vehicle,
The glass frit comprises Pb, Te and Bi components,
The glass frit is coated with an organic solution prepared by dissolving an aliphatic amine compound including octadecylamine (Octadecylamine) in alcohol at a concentration of 0.1 to 0.5% in a concentration of 0.1 nm to 50 nm. A conductive paste for forming a front electrode of a solar cell, characterized in that formed.
delete delete delete The method of claim 1,
The glass frit is a first glass frit,
The conductive paste further includes a second glass frit,
The surface of the second glass frit is not coated or coated with a fatty acid conductive paste for forming a front electrode of a solar cell.
The method of claim 5,
The fatty acid includes lauric acid, oleic acid, stearic acid, palmitic acid or acetic acid, the conductive paste for forming a front electrode of a solar cell.
In a solar cell having a front electrode on the upper substrate, and a back electrode on the lower substrate,
The front electrode is manufactured by applying a conductive paste for forming the front electrode of the solar cell of any one of claims 1, 5 and 6, drying and baking.

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