WO2024066335A1

WO2024066335A1 - Method for preparing electrode of solar cell

Info

Publication number: WO2024066335A1
Application number: PCT/CN2023/091103
Authority: WO
Inventors: 张海川; 秦浩; 石建华; 付昊鑫; 孟凡英; 刘正新
Original assignee: 通威太阳能（成都）有限公司
Priority date: 2022-09-26
Filing date: 2023-04-27
Publication date: 2024-04-04
Also published as: CN115411148A; CN115411148B

Abstract

The present application provides a method for preparing an electrode of a solar cell, comprising the following steps: mixing spherical metal powder with a first solvent to obtain first metal paste; mixing flaky metal powder with a second solvent to obtain second metal paste; mixing part of the first metal paste with the second metal paste to obtain low-temperature metal paste; and using the low-temperature metal paste to prepare an electrode on a solar cell precursor in a screen printing manner, and in the process of preparing the electrode, when the proportion of the spherical metal powder and the flaky metal powder in the low-temperature metal paste is imbalanced, supplementing the remaining first metal paste into the low-temperature metal paste. The present application can improve the printing property of the low-temperature metal paste, and improve the conductivity of the electrode generated by the low-temperature metal paste.

Description

Method for preparing solar cell electrode

This application claims the priority of the Chinese patent application filed with the China Patent Office on September 26, 2022, with application number 202211178442.6 and application name “Method for Preparing Solar Cell Electrodes”, all contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of solar cells, and in particular to a method for preparing a solar cell electrode.

Background technique

Solar cells, such as heterojunction solar cells, also known as HJT cells (Hereto-junction with Intrinsic Thin-layer), are hailed as the most promising solar cells after emitter and rear passivation (PERC) cells. At present, the preparation method of heterojunction solar cell electrodes still follows the traditional PERC cell electrode preparation method - screen printing. Since the amorphous silicon or microcrystalline silicon in heterojunction solar cells belongs to a metastable structure and cannot withstand high-temperature sintering processes, the high-temperature metal paste used in PERC cells, such as high-temperature silver paste, cannot be directly used in heterojunction solar cells, which limits the preparation of electrodes for heterojunction solar cells. In response to this problem, silver paste manufacturers have begun to develop low-temperature silver paste. In order to ensure that the prepared electrode has excellent conductivity, the low-temperature silver paste usually contains spherical silver powder and flaky silver powder.

However, since the size of flaky silver powder is usually larger than that of spherical silver powder, and the fluidity of flaky silver powder is poorer than that of spherical silver powder, the ratio of spherical silver powder to flaky silver powder in the remaining silver paste on the screen changes during the screen printing process of the low-temperature silver paste (i.e., the ratio of flaky silver powder in the remaining low-temperature silver paste on the screen increases in the later stage of printing), which makes the printability of the remaining low-temperature silver paste worse. At the same time, due to the increase in the ratio of flaky silver powder in the remaining low-temperature silver paste, when the low-temperature silver paste is solidified, the porosity of the silver electrode is increased and the conductivity of the silver electrode is reduced.

Summary of the invention

Based on this, it is necessary to provide a method for preparing solar cell electrodes that can improve the printability of low-temperature metal paste and the electrical conductivity of the electrode.

At least one embodiment of the present application provides a method for preparing a solar cell electrode, comprising the following steps:

Mixing the spherical metal powder and the first solvent to obtain a first metal slurry;

mixing the flake metal powder with a second solvent to obtain a second metal slurry;

mixing part of the first metal slurry and the second metal slurry to obtain a low-temperature metal slurry; and

The low-temperature metal paste is used to prepare electrodes on solar cell precursors by screen printing. During the preparation of the electrodes, when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced, the remaining first metal paste is added to the low-temperature metal paste.

In some embodiments, the spherical metal powder includes at least one of spherical silver powder, spherical copper powder, spherical gold powder and spherical aluminum powder.

In some embodiments, the flaky metal powder includes at least one of flaky silver powder, flaky copper powder, flaky gold powder and flaky aluminum powder.

In some embodiments, the basis for determining whether the ratio of the spherical metal powder to the flake metal powder in the low-temperature metal slurry is unbalanced includes:

The printing speed of the screen printing is reduced.

The conductivity of the electrode decreases.

In some embodiments, mixing part of the first metal paste and the second metal paste specifically includes:

Part of the first metal paste and the second metal paste are mixed in a mass ratio of 1:3 to 1:2.

In some embodiments, the step of mixing the spherical metal powder and the first solvent to obtain the first metal slurry specifically includes the following steps:

The spherical metal powder, a first binder, a first curing agent, a first dispersant, a first diluent and the first solvent are mixed to obtain the first metal slurry.

In some embodiments, in the first metal slurry, the mass fraction of the spherical metal powder is 85%-95%, the mass fraction of the first binder is 1%-4%, the mass fraction of the first curing agent is 1%-2%, the mass fraction of the first dispersant is 0%-1.5%, the mass fraction of the first diluent is 1%-3%, and the mass fraction of the first solvent is 1%-4.5%.

In some embodiments, the first binder includes a first organic binder, and the first organic binder includes at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy novolac resin, polyurethane, polyester, alkyd resin and acrylate resin.

In some embodiments, the first curing agent includes at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.

In some embodiments, the first dispersant includes at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol fatty acid esters, methyl cellulose and ethyl cellulose.

In some embodiments, the first diluent includes at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.

In some embodiments, the first solvent includes at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecahydrate and trimethylcyclohexenone.

In some embodiments, the step of mixing the flaky metal powder with the second solvent to obtain the second metal slurry specifically comprises the following steps:

The flaky metal powder, a second binder, a second curing agent, a second dispersant, a second diluent and the second solvent are mixed to obtain the second metal slurry.

In some of the embodiments, in the second metal slurry, the mass fraction of the flaky metal powder is 85%-95%, the mass fraction of the second binder is 1%-4%, the mass fraction of the second curing agent is 1%-2%, the mass fraction of the second dispersant is 0%-1.5%, the mass fraction of the second diluent is 1%-3%, and the mass fraction of the second solvent is 1%-4.5%.

In some embodiments, the second binder includes a second organic binder, and the second organic binder includes at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy novolac resin, polyurethane, polyester, alkyd resin and acrylate resin.

In some embodiments, the second curing agent includes at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.

In some embodiments, the second dispersant includes at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol fatty acid esters, methyl cellulose and ethyl cellulose.

In some embodiments, the second diluent includes at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.

In some embodiments, the second solvent includes at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecahydrate and trimethylcyclohexenone.

In the present application, the spherical metal powder and the first solvent are mixed to prepare the first metal paste, and the flake metal powder and the second solvent are mixed to prepare the second metal paste, that is, the first metal paste and the second metal paste are prepared separately by a separate preparation method. When in use, the user can obtain the low-temperature metal paste by mixing the first metal paste and the second metal paste in a suitable ratio according to the needs. At the same time, when the ratio of the spherical metal powder and the flake metal powder in the low-temperature metal paste changes during the screen printing process, the first metal paste can be added to the low-temperature metal paste in time to ensure that the spherical metal powder and the flake metal powder in the low-temperature metal paste are in a suitable ratio, thereby improving the printability of the low-temperature metal paste. When the low-temperature metal paste is solidified, the porosity of the electrode generated by the low-temperature metal paste is reduced, and the conductivity of the electrode is improved, thereby ensuring the quality and efficiency of the solar cell. At the same time, the present application can conveniently adjust the ratio of the spherical metal powder and the flake metal powder in the low-temperature metal paste, thereby providing users with great flexibility and stability of product quality.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

FIG1 is a flow chart of the preparation of solar cell electrodes provided in this application.

Detailed ways

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The drawings show preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the one described herein. Examples. On the contrary, the purpose of providing these examples is to make the understanding of the disclosure of the present application more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and/or" used herein includes any and all combinations of one or more related listed items.

Referring to FIG. 1 , at least one embodiment of the present application provides a method for preparing a solar cell electrode, comprising the following steps:

Step S11, mixing the spherical metal powder and the first solvent to obtain a first metal slurry.

Specifically, the spherical metal powder, the first binder, the first curing agent, the first dispersant, the first diluent and the first solvent are uniformly mixed to obtain the first metal slurry. In the first metal slurry, the mass fraction of the spherical metal powder is 85%-95%, the mass fraction of the first binder is 1%-4%, the mass fraction of the first curing agent is 1%-2%, the mass fraction of the first dispersant is 0%-1.5%, the mass fraction of the first diluent is 1%-3%, and the mass fraction of the first solvent is 1%-4.5%.

In one embodiment, the spherical metal powder includes at least one of spherical silver powder, spherical copper powder, spherical gold powder and spherical aluminum powder. Preferably, the spherical metal powder is spherical silver powder.

In one embodiment, the first binder includes a first organic binder, and the first organic binder includes at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy novolac resin, polyurethane, polyester, alkyd resin and acrylate resin.

In one embodiment, the first curing agent includes at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.

In one embodiment, the first dispersant includes at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol fatty acid esters, methyl cellulose and ethyl cellulose.

In one embodiment, the first diluent includes at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.

In one embodiment, the first solvent includes at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecaned and trimethylcyclohexenone.

Step S12: Mix the flaky metal powder and the second solvent to obtain a second metal slurry.

Specifically, the flaky metal powder, the second binder, the second curing agent, the second dispersant, the second diluent and the second solvent are uniformly mixed to obtain the second metal slurry. In the second metal slurry, the mass fraction of the flaky metal powder is 85%-95%, the mass fraction of the second binder is 1%-4%, the mass fraction of the second curing agent is 1%-2%, the mass fraction of the second dispersant is 0%-1.5%, the mass fraction of the second diluent is 1%-3%, and the mass fraction of the second solvent is 1%-4.5%.

In one embodiment, the flaky metal powder is any one of flaky silver powder, flaky copper powder, flaky gold powder and flaky aluminum powder. Preferably, the flaky metal powder is flaky silver powder.

In one embodiment, the second binder includes a second organic binder, and the second organic binder includes at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy novolac resin, polyurethane, polyester, alkyd resin and acrylate resin.

In one embodiment, the second curing agent includes at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.

In one embodiment, the second dispersant includes at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol fatty acid ester, methyl cellulose and ethyl cellulose.

In one embodiment, the second diluent includes at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.

In one embodiment, the second solvent includes at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecaned and trimethylcyclohexenone.

Step S13: mixing part of the first metal slurry and the second metal slurry to obtain a low-temperature metal slurry.

Specifically, part of the first metal paste and part of the second metal paste are uniformly mixed in a mass ratio of 1:3 to 1:2 to obtain the low-temperature metal paste.

Step S14, preparing electrodes on solar cell precursors by screen printing the low-temperature metal paste, and in the process of preparing the electrodes, when the ratio of the spherical metal powder and the flaky metal powder in the low-temperature metal paste is unbalanced, adding the remaining first metal paste to the low-temperature metal paste.

It is understandable that preparing electrodes by screen printing requires placing the low-temperature metal paste on a screen and transferring the low-temperature metal paste through the mesh of the screen to the solar cell precursor by squeezing with a scraper to prepare the electrode.

During the screen printing process, when the ratio of the spherical metal powder and the flaky metal powder in the low-temperature metal paste is unbalanced (which can be determined by the printability and printing quality of the low-temperature metal paste, that is, the printing speed of the screen printing is reduced or the conductivity of the electrode prepared by the low-temperature metal paste is reduced), it is necessary to pour out the low-temperature metal paste on the screen, and add a certain amount of the remaining first metal paste to the poured low-temperature metal paste, and stir evenly to ensure that the spherical metal powder and the flaky metal powder in the low-temperature silver paste are in a suitable ratio, and then continue to prepare the electrode by screen printing with the low-temperature metal paste after adding the first metal paste.

It can be understood that after screen printing, a curing step is required to obtain the electrode.

In one embodiment, the solar cell mentioned in the present application may be a heterojunction cell.

The present application is further described below through specific examples and comparative examples.

Example 1

(1) Spherical silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethyl butyl ether are uniformly mixed to obtain a first silver paste. In the first silver paste, the mass fraction of the spherical silver powder is 90%, the mass fraction of the bisphenol A epoxy resin is 3%, the mass fraction of dicyandiamide is 2%, the mass fraction of polyacrylamide is 1%, and the mass fraction of glycidyl ether is 1%. The mass fraction of glycerol ether is 2%, and the mass fraction of diethyl butyl ether is 2%.

(2) Evenly mix the flaky silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethyl butyl ether to obtain a second silver paste. In the second silver paste, the mass fraction of the flaky silver powder is 90%, the mass fraction of the bisphenol A epoxy resin is 3%, the mass fraction of dicyandiamide is 2%, the mass fraction of polyacrylamide is 1%, the mass fraction of glycidyl ether is 2%, and the mass fraction of diethyl butyl ether is 2%.

(3) Part of the first silver paste and the second silver paste are mixed evenly in a mass ratio of 1:3 to obtain a low-temperature silver paste.

(4) preparing electrodes on heterojunction solar cell precursors by screen printing of low-temperature silver paste, and in the process of preparing electrodes, when the printing speed of screen printing is reduced, pouring out the low-temperature silver paste on the screen, adding a certain amount of remaining first silver paste to the poured low-temperature silver paste, and stirring evenly to ensure that the spherical silver powder and the flaky silver powder in the low-temperature silver paste are in a suitable ratio, and then continuing to prepare electrodes by screen printing with the low-temperature silver paste after adding the first silver paste, thereby obtaining a heterojunction solar cell.

Comparative Example 1

(1) Evenly mix spherical silver powder, flaky silver powder, bisphenol A epoxy resin, dicyandiamide, polyacrylamide, glycidyl ether and diethyl butyl ether to obtain a low-temperature silver paste. In the low-temperature silver paste, the mass fraction of the spherical silver powder, the mass fraction of the flaky silver powder, the mass fraction of the bisphenol A epoxy resin, the mass fraction of dicyandiamide, the mass fraction of polyacrylamide, the mass fraction of glycidyl ether and the mass fraction of diethyl butyl ether are respectively equal to the mass fractions of the corresponding components in the low-temperature silver paste in step (3) of Example 1.

(2) A low-temperature silver paste is applied to a heterojunction solar cell precursor by screen printing to prepare an electrode, thereby obtaining a heterojunction solar cell.

The electrical conductivity of the electrodes in the heterojunction solar cells prepared in Example 1 and Comparative Example 1 and the efficiency of the heterojunction solar cells were tested respectively. The test results showed that the electrical conductivity of the electrodes in the heterojunction solar cell prepared in Example 1 was much greater than the electrical conductivity of the electrodes in the heterojunction solar cell prepared in Comparative Example 1, and the efficiency of the heterojunction solar cell prepared in Example 1 was also much greater than the efficiency of the heterojunction solar cell prepared in Comparative Example 1.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

A method for preparing a solar cell electrode, characterized in that it comprises the following steps:

Mixing the spherical metal powder and the first solvent to obtain a first metal slurry;

mixing the flake metal powder with a second solvent to obtain a second metal slurry;

mixing part of the first metal slurry and the second metal slurry to obtain a low-temperature metal slurry; and

The low-temperature metal paste is used to prepare electrodes on solar cell precursors by screen printing. During the preparation of the electrodes, when the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal paste is unbalanced, the remaining first metal paste is added to the low-temperature metal paste.
The method for preparing a solar cell electrode according to claim 1, characterized in that the spherical metal powder comprises at least one of spherical silver powder, spherical copper powder, spherical gold powder and spherical aluminum powder.
The method for preparing a solar cell electrode according to claim 1 or 2, characterized in that the flaky metal powder comprises at least one of flaky silver powder, flaky copper powder, flaky gold powder and flaky aluminum powder.
The method for preparing a solar cell electrode according to any one of claims 1 to 3, characterized in that the basis for determining whether the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal slurry is unbalanced includes:

The printing speed of the screen printing is reduced.
The method for preparing a solar cell electrode according to any one of claims 1 to 4, characterized in that the basis for determining whether the ratio of the spherical metal powder to the flaky metal powder in the low-temperature metal slurry is unbalanced includes:

The conductivity of the electrode decreases.
The method for preparing a solar cell electrode according to any one of claims 1 to 5, characterized in that mixing part of the first metal paste and the second metal paste specifically comprises:

Part of the first metal paste and the second metal paste are mixed in a mass ratio of 1:3 to 1:2.
The method for preparing a solar cell electrode according to any one of claims 1 to 6, characterized in that the mixing of the spherical metal powder and the first solvent to obtain the first metal slurry specifically comprises the following steps:

The spherical metal powder, the first binder, the first curing agent, the first dispersant, the first diluent and The first solvents are mixed to obtain the first metal slurry.
The method for preparing a solar cell electrode as described in claim 7 is characterized in that, in the first metal slurry, the mass fraction of the spherical metal powder is 85%-95%, the mass fraction of the first binder is 1%-4%, the mass fraction of the first curing agent is 1%-2%, the mass fraction of the first dispersant is 0%-1.5%, the mass fraction of the first diluent is 1%-3%, and the mass fraction of the first solvent is 1%-4.5%.
The method for preparing a solar cell electrode according to claim 7 or 8, characterized in that the first binder includes a first organic binder, and the first organic binder includes at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin and acrylate resin.
The method for preparing a solar cell electrode according to any one of claims 7 to 9, characterized in that the first curing agent comprises at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.
The method for preparing a solar cell electrode according to any one of claims 7 to 10, characterized in that the first dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol esters of fatty acids, methyl cellulose and ethyl cellulose.
The method for preparing a solar cell electrode according to any one of claims 7 to 11, characterized in that the first diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.
The method for preparing a solar cell electrode according to any one of claims 7 to 12, characterized in that the first solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecahydrate and trimethylcyclohexenone.
The method for preparing a solar cell electrode according to any one of claims 1 to 13, characterized in that the step of mixing the flaky metal powder with the second solvent to obtain the second metal slurry specifically comprises the following steps:

The flake metal powder, the second binder, the second curing agent, the second dispersant, the second diluent and The second solvents are mixed to obtain the second metal slurry.
The method for preparing a solar cell electrode as described in claim 14 is characterized in that, in the second metal slurry, the mass fraction of the flaky metal powder is 85%-95%, the mass fraction of the second binder is 1%-4%, the mass fraction of the second curing agent is 1%-2%, the mass fraction of the second dispersant is 0%-1.5%, the mass fraction of the second diluent is 1%-3%, and the mass fraction of the second solvent is 1%-4.5%.
The method for preparing a solar cell electrode according to claim 14 or 15, characterized in that the second binder comprises a second organic binder, and the second organic binder comprises at least one of bisphenol A epoxy resin, bisphenol S epoxy resin, bisphenol F epoxy resin, epoxy phenolic resin, polyurethane, polyester, alkyd resin and acrylate resin.
The method for preparing a solar cell electrode according to any one of claims 14 to 16, characterized in that the second curing agent comprises at least one of dicyandiamide, hexahydromethylphthalic anhydride, diethylenetriamine, tetraethylenepentamine, trimethylhexamethylenediamine, aminoethylpiperazine, diaminodiphenyl sulfone, glutaric anhydride, pyromellitic anhydride, alkyl alcohol amine, trimethylolpropane and dicyanoethylethylenediamine.
The method for preparing a solar cell electrode according to any one of claims 14 to 17, characterized in that the second dispersant comprises at least one of oleic acid, polyacrylamide, thiourea dioxide, polyethylene glycol esters of fatty acids, methyl cellulose and ethyl cellulose.
The method for preparing a solar cell electrode according to any one of claims 14 to 18, characterized in that the second diluent comprises at least one of glycidyl ether, polyol, glycidyl ester, acetate and styrene.
The method for preparing a solar cell electrode according to any one of claims 14 to 19, characterized in that the second solvent comprises at least one of diethanol butyl ether, triethanol butyl ether, diethanol butyl ether acetate, diethanol ethyl ether acetate, alcohol ester dodecahydrate and trimethylcyclohexenone.