阅读说明：本技术 晶硅太阳能电池正面导电银浆及其制备方法和太阳能电池 (Crystalline silicon solar cell front conductive silver paste and preparation method thereof and solar cell ) 是由 孙丰振 李宇 刘小丽 李德林 于 2018-05-29 设计创作，主要内容包括：一种晶硅太阳能电池正面导电银浆及其制备方法和太阳能电池。按照重量份计,该晶硅太阳能电池正面导电银浆包括以下原料组分：金属粉80.0～93.0份；有机载体6.0～15.0份；玻璃粉1.0～5.0份；硅油0.06～3.75份；其中,该硅油为甲基硅油、乙基硅油、苯基硅油、甲基含氢硅油、甲基苯基硅油、甲基氯苯基硅油、甲基乙氧基硅油、甲基三氟丙基硅油、甲基乙烯基硅油、甲基羟基硅油、乙基含氢硅油、羟基含氢硅油、含氰硅油中的至少一种。该正面导电银浆具有优良的细栅丝网印刷性能,能够在23μm开口的丝网网版上印刷,最终获得高宽比优良的正面电极,从而使太阳能电池片具有电流高,转化率高的特点。(Crystalline silicon solar cell front conductive silver paste, preparation method thereof and solar cell. The conductive silver paste for the front side of the crystalline silicon solar cell comprises the following raw material components in parts by weight: 80.0-93.0 parts of metal powder; 6.0-15.0 parts of an organic carrier; 1.0-5.0 parts of glass powder; 0.06-3.75 parts of silicone oil; wherein the silicone oil is at least one of methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorphenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoro propyl silicone oil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil and cyanogen-containing silicone oil. The front conductive silver paste has excellent fine grid screen printing performance, can be printed on a 23-micrometer-opening screen printing plate, and finally obtains a front electrode with an excellent aspect ratio, so that the solar cell has the characteristics of high current and high conversion rate.)

Claims

[ claim 1] the crystalline silicon solar cell front conductive silver paste is characterized by comprising the following raw material components in parts by weight:

80.0 parts of metal powder 80.0 ~ 93.0.0 parts;

organic vehicle 6.0 ~ 15.0.0 parts;

1.0 part of glass powder 1.0 ~ 5.0.0 part;

0.06 parts of silicone oil 0.06 ~ 3.75.75 parts;

the silicone oil is at least one of methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorphenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoro propyl silicone oil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil and cyanogen-containing silicone oil.

[ claim 2] the crystalline silicon solar cell front surface conductive silver paste according to claim 1, wherein the glass powder is one or a mixture of two of a lead glass powder and a lead-free glass powder.

[ claim 3] the crystalline silicon solar cell front surface conductive silver paste as claimed in claim 2, wherein the lead glass powder comprises the following components in 100% by weight:

PbO 0.1-50%；

Te0 ₂ 5-50%；

Li ₂0 0.5-35.0%；

Bi ₂0 ₃ 1.0-35.0%；

oxide of the added element 0 ~ 40.0.0%.

[ claim 4] the crystalline silicon solar cell front surface conductive silver paste according to claim 2, wherein the lead-free glass powder comprises the following components in 100% by weight:

Te0 ₂ 40-70%；

Li ₂0 2-30.0%；

Bi ₂0 ₃ 5-35.0%；

oxide of the added element 0 ~ 40.0.0%.

[ claim 5] the crystalline silicon solar cell front side conductive silver paste according to any one of claims 3 or 4, wherein the additive element in the oxide of the additive element is at least one of titanium, cobalt, chromium, scandium, copper, niobium, vanadium, sodium, tantalum, strontium, bromine, cobalt, hafnium, lanthanum, yttrium, ytterbium, iron, barium, manganese, tungsten, nickel, tin, arsenic, zirconium, potassium, phosphorus, indium, gallium, germanium, silicon, boron, zinc, tungsten, and magnesium.

[ claim 6] the crystalline silicon solar cell front conductive silver paste according to claim 1, wherein the metal powder is at least one of silver, gold, platinum, copper, iron, nickel, zinc, titanium, cobalt, chromium, manganese, palladium and rhodium.

[ claim 7] the crystalline silicon solar cell front conductive silver paste according to claim 1, wherein the metal powder is at least one of silver-coated copper, iron, nickel, zinc, titanium, cobalt, chromium, cobalt, manganese, and wherein the thickness of the silver-coated layer is 10 ~ 50 nm.

[ claim 8] the crystalline silicon solar cell front conductive paste according to claim 1, wherein the metal powder is a mixture of a non-silver-coated metal powder and a silver-coated metal powder, the weight ratio of the non-silver-coated metal powder to the silver-coated metal powder is 5/95 ~ 95/5, the non-silver-coated metal powder is at least one of silver, gold, pin, copper, iron, thill, casting, chaincast, diamond, , poster, manganese, ffi and rhodium, the silver-coated metal powder is at least one of copper, iron, nickel, zinc, titanium, cobalt, chromium, poster and manganese, and the thickness of the silver-coated layer is 10 ~ 50n m.

[ claim 9] the method for preparing the conductive paste for the front surface of the crystalline silicon solar cell according to any one of claim 1 ~ 8, characterized by comprising at least the following steps:

step S01, melting raw material components of glass powder to obtain glass powder melt, carrying out quenching treatment on the melt to obtain glass powder particles, and crushing the glass powder particles to obtain glass powder with a particle size of 0.1 ~ 5 (Vm;

s02, placing the organic carrier raw material in an environment of 40 ~ 100 ℃ for mixing treatment to obtain an organic carrier;

and S03, mixing the metal powder with the glass powder obtained in the step S01, the organic carrier obtained in the step S02 and the silicone oil to obtain the conductive silver paste on the front surface of the crystalline silicon solar cell.

[ claim 10] the method for producing a crystalline silicon solar cell front surface conductive paste according to claim 11, characterized in that the quenching treatment is a water cooling treatment or a cold air treatment.

[ claim 11] A method for manufacturing a front electrode of a crystalline silicon solar cell, characterized by comprising at least the following steps:

providing a crystalline silicon semiconductor element with an insulating film laminated on the surface;

printing the crystalline silicon solar cell front conductive paste as defined in any one of claims 1 ~ 10 on the surface of the insulating film by means of printing, and sequentially performing drying, sintering and cooling treatment to obtain the crystalline silicon solar cell front electrode.

[ claim 12] the method for producing a crystalline silicon solar cell front electrode according to claim 11, characterized in that the sintering temperature is 700 ~ 820 ℃ and/or the drying temperature is 80 ~ 400 ℃.

[ claim 13] the method for manufacturing a front electrode of a crystalline silicon solar cell according to claim 11, wherein the insulating film is at least one of a silicon nitride film, a titanium oxide film, an aluminum oxide film, and a silicon oxide film.

[ claim 14] A crystalline silicon solar cell, characterized in that the crystalline silicon solar cell adopts a crystalline silicon solar cell front electrode manufactured by the method for manufacturing the crystalline silicon solar cell front electrode according to any one of claims 11 ~ 13.

Technical Field

[0001] The invention belongs to the technical field of solar cells, and particularly relates to crystalline silicon solar cell front conductive silver paste, a preparation method thereof and a solar cell. Background

[0002] Solar energy is an inexhaustible clean energy. With the increasing exhaustion of non-renewable energy sources such as coal and petroleum, the development and utilization of solar energy become a big hot spot. The solar cell developed based on the idea is an important means for utilizing solar energy. At present, a crystalline silicon solar cell for realizing industrialization has become a model for solar cell application.

[0003] The cell is used as a core component of the crystalline silicon solar cell, and in order to collect and guide out the current generated under illumination, an electrode needs to be respectively manufactured on the front surface and the back surface of the cell. The method for manufacturing the electrode is various, and screen printing and co-firing are the most common production processes at present. For example, in the manufacture of the front electrode, the conductive paste is coated on the silicon wafer by screen printing, and the front electrode is formed on the front surface of the silicon wafer by sintering. The sintered positive electrode of the crystalline silicon solar cell needs to be firmly attached to a silicon wafer, the grid line is narrow and high, the shading area is small, welding is easy, and the conductive slurry for the positive electrode of the crystalline silicon solar cell needs to have the capability of penetrating through a silicon nitride antireflection film in the sintering process and form good ohmic contact with the silicon wafer

[0004] The common conductive silver paste on the front surface of the crystalline silicon solar cell consists of silver powder, glass powder and an organic carrier, and the conductive silver paste is printed on the surface of a cell piece in a screen printing mode and sintered to form a front electrode. The screen printing performance of the front conductive silver paste is important to the overall service performance of the front conductive silver paste, and the organic carrier is a main factor for determining the screen printing performance of the front conductive silver paste. In order to improve the conversion efficiency of the solar cell, the front conductive silver paste is required to be printed on the finer screen auxiliary grid opening, and the printed auxiliary grid has an excellent height-width ratio, the larger the ratio of the height to the width of the grid line is, the lower the resistance of the grid line is, the high efficiency of the cell is, the finer the screen auxiliary grid opening is, the thinner the width of the front conductive silver paste auxiliary grid printed on the surface of the cell is, the less the covering on the surface of the cell is, the larger the area of the cell for receiving solar light is, the higher the conversion efficiency is, but the finer the screen auxiliary grid opening is, the larger the printing difficulty is, and the better the screen printing performance of the front conductive silver paste is required.

Summary of The Invention

Technical problem

[0005] The technical problem to be solved by the invention is as follows: the utility model provides a crystalline silicon solar cell positive conductive silver thick liquid and preparation method thereof to solve the current positive conductive silver thick liquid existence can not print on the fine rule, thereby lead to positive conductive silver thick liquid must just can print on the battery piece on wider open-ended silk screen, make the positive electrode width after the sintering wide, it is big to cover the solar cell area, has reduced effectual solar cell utilization area, makes the problem that the battery piece photoelectric conversion efficiency is low at last.

[0006] Furthermore, the invention also provides a manufacturing method of the crystalline silicon solar cell front electrode and a solar cell.

Solution to the problem

Technical solution

[0007] In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

[0008] the conductive silver paste for the front side of the crystalline silicon solar cell comprises the following components in parts by weight based on 100 parts by weight:

[0009] 80.0 parts of metal powder 80.0 ~ 93.0.0 parts;

[0010] organic vehicle 6.0 ~ 15.0.0 parts;

[0011] 1.0 part of glass powder 1.0 ~ 5.0.0 part;

[0012] 0.1 ~ 3.75.75 portions of silicone oil

[0013] Wherein the cassia oil is at least one of methyl cassia oil, ethyl cassia oil, phenyl cassia oil, methyl chlorine-containing cassia oil, methyl phenyl silicone oil, methyl chlorphenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil and cyanogen-containing silicone oil.

[0014] Correspondingly, the preparation method of the conductive silver paste on the front side of the crystalline silicon solar cell at least comprises the following steps of [0015] step S01. melting raw material components of glass powder to obtain glass powder melt, carrying out quenching treatment on the melt to obtain glass powder particles, and crushing to obtain glass powder with the particle size of 0.1 ~ 5. (Vm;

[0016] step S02, placing the organic carrier raw material in an environment of 40 ~ 100 ℃ for mixing treatment to obtain an organic carrier, step S0017, carrying out mixing treatment on metal powder, the glass powder obtained in step S01, the organic carrier obtained in step S02 and silicon oil to obtain crystalline silicon solar cell front conductive silver paste [0018], and correspondingly, the manufacturing method of the crystalline silicon solar cell front electrode at least comprises the following steps:

[0019] providing a crystalline silicon semiconductor element with an insulating film laminated on the surface;

[0020] and printing the conductive silver paste on the front surface of the crystalline silicon solar cell on the surface of the insulating film in a printing mode, and then sequentially carrying out drying, sintering and cooling treatment to obtain the crystalline silicon solar cell front electrode.

[0021] And the crystalline silicon solar cell adopts the crystalline silicon solar cell front electrode.

Advantageous effects of the invention

Advantageous effects

[0022] Compared with the prior art, the conductive silver paste on the front surface of the crystalline silicon solar cell provided by the invention contains silicone oil, so that the screening performance and the flowability of the conductive silver paste on the front surface are improved, the screen printing performance is greatly improved, printing can be performed on a silk screen with a narrower opening, the width of the manufactured front surface silver electrode is narrower, a better height-width ratio is obtained, the covering area of the solar cell is reduced, the effective area of the solar cell for receiving sunlight is increased, and the conversion efficiency and the utilization efficiency of the solar cell are improved.

[0023] The preparation method of the crystalline silicon solar cell front conductive silver paste provided by the invention is simple in process conditions, and the obtained front conductive silver paste is uniform in components and good in performance, and is suitable for industrial large-scale production.

Brief description of the drawings