WO2015014032A1 - Aluminium paste dedicated for local aluminium back surface field crystalline silicon solar cell and preparation method therefor - Google Patents

Aluminium paste dedicated for local aluminium back surface field crystalline silicon solar cell and preparation method therefor Download PDF

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WO2015014032A1
WO2015014032A1 PCT/CN2013/086032 CN2013086032W WO2015014032A1 WO 2015014032 A1 WO2015014032 A1 WO 2015014032A1 CN 2013086032 W CN2013086032 W CN 2013086032W WO 2015014032 A1 WO2015014032 A1 WO 2015014032A1
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parts
crystalline silicon
silicon solar
aluminum
aluminium
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PCT/CN2013/086032
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French (fr)
Chinese (zh)
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刘细莲
丁冰冰
马进
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广州市儒兴科技开发有限公司
无锡市儒兴科技开发有限公司
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Publication of WO2015014032A1 publication Critical patent/WO2015014032A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0216—Coatings
    • H01L31/02161—Coatings for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02167—Coatings for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/186—Particular post-treatment for the devices, e.g. annealing, impurity gettering, short-circuit elimination, recrystallisation
    • H01L31/1868—Passivation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to a special aluminum paste for a partial aluminum back field crystalline silicon solar cell, and at the same time, the invention also relates to a method for preparing the slurry.
  • a solar cell is a device that converts solar radiation directly into electrical energy.
  • conversion efficiency is the ratio of output energy to input energy per unit area.
  • the improvement of solar cell conversion efficiency is mainly carried out in two aspects: First, in optical terms, the absorption of incident light by solar cells is continuously improved by various means to generate more photogenerated carriers; the other is electrical, minimizing photogeneration. The recombination of carriers in the cell body and at the surface, while reducing various resistance losses, allowing more electrical energy to be output to the external load.
  • Passivated Emitter and Rear Cell Crystallized silicon solar cells are a type of high-efficiency battery.
  • the back surface of the crystalline aluminum solar cell is coated with a passivation film.
  • the passivation film is generally perforated or grooved by laser ablation (the groove width is generally 30 ⁇ 50 ⁇ , the pitch is about 1mm), and the aluminum is The paste is printed on the passivation film, and the aluminum paste is in contact with the silicon substrate only at the perforations or slots, and the back electric field is extracted by point or line contact.
  • the local aluminum back field structure adds a string The junction resistance, the fill factor FF also decreased, but the open circuit voltage Voc and the short-circuit current density Jsc of the cell were improved, and the overall effect still improved the conversion efficiency by 0.8-1.2%. Based on the above advantages, the local aluminum back field structure is increasingly valued by battery manufacturers at home and abroad.
  • the solar cell with a partial aluminum back field structure also puts higher requirements on the conductive aluminum paste.
  • the conventional aluminum paste is too corrosive to cause serious damage to the passivation film on the surface of the battery; and the conventional aluminum paste cannot be well Filling the perforations or grooves on the passivation film does not form a good ohmic contact with the silicon substrate, that is, poor contact with the passivation film window. Therefore, it is necessary to develop an aluminum paste suitable for a local aluminum back field solar cell.
  • the aluminum paste for the partial aluminum back field crystalline silicon solar battery provided by the invention is prepared from the following raw materials by mass ratio: 70-80 parts of aluminum powder, 0.05-3 parts of inorganic binder, 20-30 parts Organic binder, 1-5 parts of additives.
  • the aluminum powder is a spherical aluminum powder having a purity of more than 99.90% and an average particle size of 2.0-6.0 ⁇ m.
  • the inorganic binder is made of the following raw materials by mass ratio: Si0 2 5-15 parts, B 2 O 3 5-20 parts, Al 2 0 3 l-6 parts, Bi 2 0 3 or PbO 35-55 parts, ZnO 5-20 parts, Ti0 2 1-3 parts and Zr0 2 l-3 parts.
  • the organic binder is made of the following raw materials in the following parts by mass: ethyl cellulose 4-10 parts, phenolic resin 0.5-3 parts, diethylene glycol monobutyl ether 5-15 parts, terpineol 35- 45 parts, 12-10 parts of alcohol ester 12, and 25-40 parts of butyl carbitol acetate.
  • the additives are various commercially available dispersants and/or leveling agents and the like.
  • the invention provides a method for preparing a special aluminum paste for a partial aluminum back field crystalline silicon solar cell, comprising the following steps:
  • the product of the invention has the following advantages:
  • the aluminum paste has good fluidity and damages the passivation film. It is small and in good contact with the passivation film window, and the contact of the aluminum paste with the window is improved by adding suitable additives.
  • the product of the invention is applied to the mass conversion conversion efficiency of the local aluminum back field single crystal silicon solar cell by 20.0%. After the battery sheet is laminated and packaged, the adhesion back force of the aluminum back field is measured by the EVA tear test.
  • Inorganic binder parts by mass taken Si0 2 15 parts, B 2 O 3 20 parts, Al 2 0 3 6 parts, Bi 2 0 3 35 parts, ZnO 20 parts, Ti0 2 3 parts of Zr0 2 l
  • the above raw materials are uniformly mixed, placed in a porcelain crucible, dried in a digital blast drying oven at 135 ⁇ 10 ° C for 2 h, placed in a high temperature furnace, and smelted at 900 ° C for 70 minutes, after water quenching. Drying, then ball milling to below 8 ⁇ , drying to obtain an inorganic binder;
  • Aluminum powder spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0 ⁇ ;
  • Additives Various commercially available dispersants, leveling agents, etc. 77 parts by mass of aluminum powder, 0.9 parts of inorganic binder, 20 parts of organic binder, 2.1 parts of adding The additive was uniformly mixed, and then ground and dispersed to a fineness of ⁇ 20 ⁇ and a viscosity of 18000 mPa-S using a three-roll mill to obtain a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell having a square resistance of ⁇ 60 m ⁇ / ⁇ .
  • inorganic binder According to the mass fraction, take Si0 2 15 parts, B 2 0 3 5 parts, A1 2 0 3 1 part, PbO 65 parts, ⁇ , parts, Ti0 2 2 parts and Zr0 2 2 parts, After the above raw materials are uniformly mixed, they are placed in a porcelain crucible, dried in a digital blast drying oven at 135 ⁇ 10 ° C for 2 h, placed in a high temperature furnace, smelted at 1000 ° C for 50 minutes, and quenched after water quenching. Then ball milling to below 8 ⁇ , drying to obtain an inorganic binder;
  • organic binder 10 parts of ethyl cellulose, 1 part of phenolic resin, 14 parts of diethylene glycol monobutyl ether, 40 parts of terpineol, 10 parts of alcohol ester, 10 parts by weight, butyl card 25 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
  • Aluminum powder spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0 ⁇ ;
  • Additives Various commercially available dispersants, leveling agents, etc. 77 parts by mass of aluminum powder, 1 part of inorganic binder, 17 parts of organic binder, 5 parts of additive are uniformly mixed, and then ground and dispersed to a fineness ⁇ 20 ⁇ , viscosity 21000 mPa using a three-roll mill S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance ⁇ 60 m ⁇ / ⁇ .
  • Inorganic binder parts by mass of parts taken Si0 2 5, B 2 0 3 15 parts, ⁇ 1 2 0 3 6 parts, Bi 2 0 3 50 parts, ZnO 20 parts, Ti0 2 l and Zr0 2 3 parts
  • the above materials are uniformly mixed, placed in a porcelain crucible, dried in a digital blast drying oven at 135 ⁇ 10 ° C for 1.5 h, placed in a high temperature furnace, and smelted at 1100 ° C. Minutes, dried after water quenching, then ball milled to below 8 ⁇ , dried to obtain an inorganic binder;
  • organic binder 7 parts of ethyl cellulose, 1.5 parts of phenolic resin, 13 parts of diethylene glycol monobutyl ether, 45 parts of terpineol, 8.5 parts of alcohol ester 12, butyl card 25 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
  • Aluminum powder spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0 ⁇ ;
  • Additives Various commercially available dispersants, leveling agents, etc. 78 parts by mass of aluminum powder, 0.1 part of inorganic binder, 18 parts of organic binder, 3.9 parts of additive are uniformly mixed, and then ground and dispersed to a fineness ⁇ 20 ⁇ , viscosity 24000 mPa using a three-roll mill. S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance ⁇ 60 m ⁇ / ⁇ .
  • Inorganic binder parts by mass taken Si0 2 10 parts, B 2 O 3 20 parts, A1 2 0 3 4 parts, PbO 45 parts, ⁇ ⁇ parts, Ti0 2 3 parts of Zr0 2 l parts, the After the above raw materials are uniformly mixed, they are placed in a porcelain crucible, dried in a digital blast drying oven at 135 ⁇ 10 ° C for 3 hours, placed in a high temperature furnace, smelted at 900 ° C for 70 minutes, and quenched after water quenching. Then ball milling to below 8 ⁇ , drying to obtain an inorganic binder;
  • organic binder 5 parts by weight of ethyl cellulose, 0.5 parts of phenolic resin, 10 parts of diethylene glycol monobutyl ether, 35 parts of terpineol, 9.5 parts of alcohol ester, butyl card 40 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
  • Aluminum powder spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0 ⁇ ;
  • Additives Various commercially available dispersants, leveling agents, etc. 73 parts by mass of aluminum powder, 3 parts of inorganic binder, 23 parts of organic binder, 1 part of additive are uniformly mixed, and then ground and dispersed to a fineness of ⁇ 20 ⁇ , viscosity of 28000 mPa using a three-roll mill. S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance ⁇ 60 m ⁇ / ⁇ .
  • Si0 2 13 parts, B 2 0 3 18 parts, A1 2 0 3 3 parts, Bi 2 0 3 56 parts, ZnO 5 parts, Ti0 2 2 parts and Zr0 2 3 parts are mixed, and the above raw materials are uniformly mixed.
  • placed in a porcelain crucible dried in a digital blast drying oven at 135 ⁇ 10 ° C for 2 h, placed in a high temperature furnace, smelted at 1000 ° C for 50 minutes, dried after water quenching, and then ball milled to below 8 ⁇ Drying to obtain an inorganic binder;
  • organic binder 4 parts of ethyl cellulose, 3 parts of phenolic resin, 8 parts of diethylene glycol monobutyl ether, 40 parts of terpineol, 12 parts of alcohol ester, 10 parts by weight, butyl card 35 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
  • Aluminum powder spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0 ⁇ ;
  • Additives Various commercially available dispersants, leveling agents, etc.
  • the aluminum paste for the partial aluminum back field crystalline silicon solar cell obtained in the above embodiments 1 to 5 is printed on the monocrystalline silicon wafer after the texturing, diffusion and coating according to the production process of the partial aluminum back field crystalline silicon solar cell. .
  • the aluminum paste has good fluidity, can well fill holes or slots in the passivation film, and forms well with the silicon substrate.
  • the photoelectric conversion efficiency of the cell is 20.0%.

Abstract

Provided is an aluminium paste dedicated for a local aluminium back surface field crystalline silicon solar cell. The paste is prepared from raw materials matched with the following parts by mass: 70-78 parts of aluminium powder, 0.05-3 parts of inorganic bond, 17-27 parts of organic bond and 1-5 parts of additive. Further provided is a preparation method for the aluminium paste dedicated for a local aluminium back surface field crystalline silicon solar cell. Therefore, compared with the traditional aluminium paste, the aluminium paste is specially applied to a local aluminium back surface field crystalline silicon solar cell, and has the advantages of good flowability, minimal damage to a passive film, good contact with a window, a compact and uniform aluminium film, etc. The average conversion efficiency of volume production for the crystalline silicon solar cell is ≥ 20.0%. After a cell slice is laminated and packaged, and an EVA tear test is performed thereon, the adhering pulling force of the aluminium back surface field is measured as ≥ 10 N.

Description

一种局部铝背场晶体硅太阳电池专用铝浆及其制备方法 技术领域  Aluminum paste for local aluminum back field crystalline silicon solar battery and preparation method thereof
本发明涉及一种局部铝背场晶体硅太阳电池专用铝浆， 同时， 本发明还涉及 所述浆料的制备方法。  The invention relates to a special aluminum paste for a partial aluminum back field crystalline silicon solar cell, and at the same time, the invention also relates to a method for preparing the slurry.
背景技术 Background technique
太阳电池是将太阳辐射直接转换成电能的一种器件， 衡量其性能的一个重要 参数就是转换效率， 即单位面积上输出能量和输入能量的比值。 提高太阳电池转 换效率主要从两个方面进行： 一是光学方面， 通过各种手段不断提高太阳电池对 入射光的吸收， 以产生更多的光生载流子； 另外一个是电学方面， 尽量减少光生 载流子在电池体内及表面处的复合， 同时减少各种电阻损耗， 使更多的电能能输 出到外部负载。  A solar cell is a device that converts solar radiation directly into electrical energy. An important parameter to measure its performance is conversion efficiency, which is the ratio of output energy to input energy per unit area. The improvement of solar cell conversion efficiency is mainly carried out in two aspects: First, in optical terms, the absorption of incident light by solar cells is continuously improved by various means to generate more photogenerated carriers; the other is electrical, minimizing photogeneration. The recombination of carriers in the cell body and at the surface, while reducing various resistance losses, allowing more electrical energy to be output to the external load.
局部铝背场结构 （Passivated Emitter and Rear Cell, 简称 PERC ) ) 晶体硅太阳 电池是高效电池的一种。早期，新南威尔士大学的 Blakers等人报到了效率为 22.8% 的此类电池， 其背表面采用热氧化的 Si02钝化， 背表面电极采用点接触形式。 局 部铝背场结构晶体硅太阳电池的背面镀有钝化膜， 钝化膜上一般通过激光烧蚀等 手段穿孔或开槽 （开槽宽度一般为 30〜50μηι， 间距为 lmm左右）， 将铝浆印刷于 钝化膜上， 铝浆只在穿孔或开槽处与硅基底接触， 背电场为点或线接触引出。 这 样既保持了背面场效应， 同时减少了背面金属接触面积， 使金属与半导体界面的 高复合速率区域大大减少， 由于背面浓掺杂区域的面积减少 （一般浓区面积仅占 全背面积的 1-2%)，也大大降低了背面的表面复合。尽管局部铝背场结构增加了串 联电阻， 填充因子 FF 也有所下降， 但电池片的开路电压 Voc和短路电流密度 Jsc 均有所提高， 综合效果仍使转换效率提高 0.8-1.2%。 基于上述优势， 局部铝背场结构越来越受到国内外电池片厂家的重视。 随着 各项配套工艺设备的不断发展与完善， 局部铝背场晶体硅太阳电池产业化趋势已 很明了。 局部铝背场结构的太阳电池对导电铝浆也提出了更高的要求， 常规铝浆 的腐蚀性太强， 会对电池表面的钝化膜造成严重的破坏； 且常规铝浆不能很好地 填充钝化膜上的穿孔或开槽， 无法与硅基底形成良好的欧姆接触， 即与钝化膜窗 口接触较差。 因此， 开发一种适合局部铝背场结构太阳电池的铝浆是十分必要的。 发明内容 本发明的目的在于提供一种适用于局部铝背场晶体硅太阳电池的专用铝浆， 该新型结构电池具有较高的光电转换效率。 本发明的另一目的在于提供一种局部铝背场晶体硅太阳电池专用铝浆的制备 方法。 本发明提供的局部铝背场晶体硅太阳电池专用铝浆， 由以下质量份配比的原 料制成： 70-80份的铝粉， 0.05-3份的无机粘合剂， 20-30份的有机粘合剂， 1-5份 的添加剂。 优选地， 所述铝粉为类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι。 更为优选地， 所述的无机粘合剂由以下质量份配比的原料制成： Si025-15份， B2O3 5-20份， Al203 l-6份， Bi203或 PbO 35-55份， ZnO 5-20份， Ti02 1-3份和 Zr02 l-3份。 所述有机粘合剂由以下质量份配比的原料制成： 乙基纤维素 4-10份， 酚醛树 脂 0.5-3份， 二乙二醇单丁醚 5-15份， 松油醇 35-45份， 醇酯十二 3-10份， 丁基 卡必醇醋酸酯 25-40份组成。 Passivated Emitter and Rear Cell (PERC) Crystallized silicon solar cells are a type of high-efficiency battery. In the early days, Blakers et al. of the University of New South Wales reported a 22.8% efficiency battery with a back-surface heat-oxidized SiO 2 passivation and a back-surface electrode in point contact. The back surface of the crystalline aluminum solar cell is coated with a passivation film. The passivation film is generally perforated or grooved by laser ablation (the groove width is generally 30~50μηι, the pitch is about 1mm), and the aluminum is The paste is printed on the passivation film, and the aluminum paste is in contact with the silicon substrate only at the perforations or slots, and the back electric field is extracted by point or line contact. This not only maintains the back surface field effect, but also reduces the back metal contact area, which greatly reduces the high recombination rate region of the metal-to-semiconductor interface, due to the reduced area of the heavily doped region on the back side (generally the rich area only accounts for 1 of the total back area). -2%) also greatly reduces the surface recombination of the back side. Although the local aluminum back field structure adds a string The junction resistance, the fill factor FF also decreased, but the open circuit voltage Voc and the short-circuit current density Jsc of the cell were improved, and the overall effect still improved the conversion efficiency by 0.8-1.2%. Based on the above advantages, the local aluminum back field structure is increasingly valued by battery manufacturers at home and abroad. With the continuous development and improvement of various supporting process equipment, the industrialization trend of local aluminum back field crystalline silicon solar cells is very clear. The solar cell with a partial aluminum back field structure also puts higher requirements on the conductive aluminum paste. The conventional aluminum paste is too corrosive to cause serious damage to the passivation film on the surface of the battery; and the conventional aluminum paste cannot be well Filling the perforations or grooves on the passivation film does not form a good ohmic contact with the silicon substrate, that is, poor contact with the passivation film window. Therefore, it is necessary to develop an aluminum paste suitable for a local aluminum back field solar cell. SUMMARY OF THE INVENTION It is an object of the present invention to provide a special aluminum paste suitable for a local aluminum back field crystalline silicon solar cell, which has a high photoelectric conversion efficiency. Another object of the present invention is to provide a method for preparing a aluminum paste for a partial aluminum back field crystalline silicon solar cell. The aluminum paste for the partial aluminum back field crystalline silicon solar battery provided by the invention is prepared from the following raw materials by mass ratio: 70-80 parts of aluminum powder, 0.05-3 parts of inorganic binder, 20-30 parts Organic binder, 1-5 parts of additives. Preferably, the aluminum powder is a spherical aluminum powder having a purity of more than 99.90% and an average particle size of 2.0-6.0 μm. More preferably, the inorganic binder is made of the following raw materials by mass ratio: Si0 2 5-15 parts, B 2 O 3 5-20 parts, Al 2 0 3 l-6 parts, Bi 2 0 3 or PbO 35-55 parts, ZnO 5-20 parts, Ti0 2 1-3 parts and Zr0 2 l-3 parts. The organic binder is made of the following raw materials in the following parts by mass: ethyl cellulose 4-10 parts, phenolic resin 0.5-3 parts, diethylene glycol monobutyl ether 5-15 parts, terpineol 35- 45 parts, 12-10 parts of alcohol ester 12, and 25-40 parts of butyl carbitol acetate.
所述添加剂为各种市售分散剂和 /或流平剂等。  The additives are various commercially available dispersants and/or leveling agents and the like.
本发明提供的一种局部铝背场晶体硅太阳电池专用铝浆的制备方法， 包括以 下步骤：  The invention provides a method for preparing a special aluminum paste for a partial aluminum back field crystalline silicon solar cell, comprising the following steps:
( 1 ) 有机粘合剂的制备： 将组成有机粘合剂的原料在反应釜内溶解， 得到均 一、 透明的有机粘合剂； (1) Preparation of an organic binder: The raw material constituting the organic binder is dissolved in a reaction vessel to obtain a uniform, transparent organic binder;
(2) 无机粘合剂的制备： 将组成无机粘合剂的原料混合均匀后， 装入瓷坩埚 中， 在数显鼓风干燥箱中干燥后， 放入高温炉中熔炼， 水淬后烘干， 然后球磨至(2) Preparation of inorganic binder: After mixing the raw materials constituting the inorganic binder, it is placed in a porcelain crucible, dried in a digital blast drying oven, and then smelted in a high-temperature furnace, and quenched after water quenching. Dry, then ball to
8μηι以下， 烘干得到无机粘合剂； 8μηι or less, dried to obtain an inorganic binder;
(3 ) 铝浆的制备： 将所述铝粉、 无机粘合剂、 有机粘合剂和添加剂混合均匀， 然后使用三辊研磨机进行研磨分散至细度 <20μηι， 粘度 15000-30000mPa.S， 得到 方阻 <60ηιΩ/α的局部铝背场晶体硅太阳电池专用铝浆产品。 上述制备方法中， 所述步骤 （1 ) 中反应釜内的溶解温度为 80-120°C ; 所述步 骤（2) 中数显鼓风干燥箱中的干燥温度为 135±10°C， 干燥时间为 l-3h， 高温炉中 的熔炼温度为 900-1100°C， 熔炼时间为 50-90分钟。 与传统铝浆相比， 本发明产品具有以下优点： 铝浆流动性好、 对钝化膜破坏 较小且与钝化膜窗口接触好， 通过加入合适添加剂来改善铝浆与窗口的接触情况。 本发明产品应用于局部铝背场单晶硅太阳电池上的量产转换效率 20.0%， 将电池 片层压封装后， 经 EVA撕拉测试， 测得铝背场附着拉力 10N。 (3) Preparation of aluminum paste: The aluminum powder, inorganic binder, organic binder and additives are uniformly mixed, and then ground and dispersed to a fineness of <20 μηι, viscosity of 15000-30000 mPa·s using a three-roll mill. A special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with square resistance <60ηιΩ/ α is obtained. In the above preparation method, the dissolution temperature in the reaction kettle in the step (1) is 80-120 ° C; the drying temperature in the digital blast drying oven in the step (2) is 135 ± 10 ° C, drying The time is l-3h, the melting temperature in the high temperature furnace is 900-1100 ° C, and the melting time is 50-90 minutes. Compared with the conventional aluminum paste, the product of the invention has the following advantages: The aluminum paste has good fluidity and damages the passivation film. It is small and in good contact with the passivation film window, and the contact of the aluminum paste with the window is improved by adding suitable additives. The product of the invention is applied to the mass conversion conversion efficiency of the local aluminum back field single crystal silicon solar cell by 20.0%. After the battery sheet is laminated and packaged, the adhesion back force of the aluminum back field is measured by the EVA tear test.
具体实施方式 以下实施例仅用于阐述本发明， 而本发明的保护范围并非仅仅局限于以下实 施例。 所述技术领域的普通技术人员依据以上本发明公开的内容和各参数所取范 围， 均可实现本发明的目的。 BEST MODE FOR CARRYING OUT THE INVENTION The following examples are merely illustrative of the present invention, and the scope of protection of the present invention is not limited to the following examples. The objects of the present invention can be achieved by those of ordinary skill in the art in view of the above disclosure and the scope of the various parameters.
实施例 1 Example 1
1 )制备无机粘合剂： 按质量份取 Si02 15份， B2O320份， Al2036份， Bi20335 份， ZnO 20份， Ti023份和 Zr02 l份， 将上述原料混合均匀后， 装入瓷坩埚中， 在数显鼓风干燥箱中于 135±10°C干燥 2h后， 放入高温炉中， 于 900°C熔炼 70分 钟， 水淬后烘干， 然后球磨至 8μηι以下， 烘干得到无机粘合剂； 1) Preparation of Inorganic binder: parts by mass taken Si0 2 15 parts, B 2 O 3 20 parts, Al 2 0 3 6 parts, Bi 2 0 3 35 parts, ZnO 20 parts, Ti0 2 3 parts of Zr0 2 l The above raw materials are uniformly mixed, placed in a porcelain crucible, dried in a digital blast drying oven at 135 ± 10 ° C for 2 h, placed in a high temperature furnace, and smelted at 900 ° C for 70 minutes, after water quenching. Drying, then ball milling to below 8μηι, drying to obtain an inorganic binder;
2) 制备有机粘合剂： 按质量份取乙基纤维素 7.5份， 酚醛树脂 2.5份， 二乙 二醇单丁醚 12份， 松油醇 39份， 醇酯十二 3份， 丁基卡必醇醋酸酯 36份， 将上 述原料在反应釜内 100°C下溶解， 得到均一、 透明的有机粘合剂；  2) Preparation of organic binder: 7.5 parts of ethyl cellulose, 2.5 parts of phenolic resin, 12 parts of diethylene glycol monobutyl ether, 39 parts of terpineol, 12 parts of alcohol ester, butyl card 36 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
3 ) 铝粉： 类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι; 3) Aluminum powder: spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0μηι ;
4) 添加剂： 各种市售分散剂、 流平剂等。 按质量份 77份的铝粉， 0.9份的无机粘合剂， 20份的有机粘合剂， 2.1份的添 加剂混合均匀， 然后使用三辊研磨机进行研磨分散至细度 < 20μηι， 粘度 18000mPa-S, 得到方阻<60mΩ/□的局部铝背场晶体硅太阳电池专用铝浆产品。 实施例 2 4) Additives: Various commercially available dispersants, leveling agents, etc. 77 parts by mass of aluminum powder, 0.9 parts of inorganic binder, 20 parts of organic binder, 2.1 parts of adding The additive was uniformly mixed, and then ground and dispersed to a fineness of < 20 μηι and a viscosity of 18000 mPa-S using a three-roll mill to obtain a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell having a square resistance of <60 mΩ/□. Example 2
1 ) 制备无机粘合剂： 按质量份取 Si02 15份， B2035份， A1203 1份， PbO 65 份， ΖηΟ ΙΟ份， Ti022份和 Zr022份， 将上述原料混合均匀后， 装入瓷坩埚中， 在数显鼓风干燥箱中于 135±10°C干燥 2h后， 放入高温炉中， 于 1000°C熔炼 50分 钟， 水淬后烘干， 然后球磨至 8μηι以下， 烘干得到无机粘合剂； 1) Preparation of inorganic binder: According to the mass fraction, take Si0 2 15 parts, B 2 0 3 5 parts, A1 2 0 3 1 part, PbO 65 parts, ΖηΟ , parts, Ti0 2 2 parts and Zr0 2 2 parts, After the above raw materials are uniformly mixed, they are placed in a porcelain crucible, dried in a digital blast drying oven at 135±10 ° C for 2 h, placed in a high temperature furnace, smelted at 1000 ° C for 50 minutes, and quenched after water quenching. Then ball milling to below 8μηι, drying to obtain an inorganic binder;
2) 制备有机粘合剂： 按质量份取乙基纤维素 10份， 酚醛树脂 1份， 二乙二 醇单丁醚 14份， 松油醇 40份， 醇酯十二 10份， 丁基卡必醇醋酸酯 25份， 将上 述原料在反应釜内 100°C下溶解， 得到均一、 透明的有机粘合剂；  2) Preparation of organic binder: 10 parts of ethyl cellulose, 1 part of phenolic resin, 14 parts of diethylene glycol monobutyl ether, 40 parts of terpineol, 10 parts of alcohol ester, 10 parts by weight, butyl card 25 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
3 ) 铝粉： 类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι; 3) Aluminum powder: spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0μηι ;
4) 添加剂： 各种市售分散剂、 流平剂等。 按质量份 77份的铝粉， 1份的无机粘合剂， 17份的有机粘合剂， 5份的添加 剂混合均匀，然后使用三辊研磨机进行研磨分散至细度 <20μηι，粘度 21000mPa-S， 得到方阻<60mΩ/□的局部铝背场晶体硅太阳电池专用铝浆产品。 实施例 3  4) Additives: Various commercially available dispersants, leveling agents, etc. 77 parts by mass of aluminum powder, 1 part of inorganic binder, 17 parts of organic binder, 5 parts of additive are uniformly mixed, and then ground and dispersed to a fineness <20 μηι, viscosity 21000 mPa using a three-roll mill S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance <60 mΩ/□. Example 3
1 )制备无机粘合剂： 按质量份取 Si025份， B203 15份， Α12036份， Bi203 50 份， ZnO 20份， Ti02 l份和 Zr023份， 将上述原料混合均匀后， 装入瓷坩埚中， 在数显鼓风干燥箱中于 135±10°C干燥 1.5h后， 放入高温炉中， 于 1100°C熔炼 80 分钟， 水淬后烘干， 然后球磨至 8μηι以下， 烘干得到无机粘合剂；1) Preparation of Inorganic binder: parts by mass of parts taken Si0 2 5, B 2 0 3 15 parts, Α1 2 0 3 6 parts, Bi 2 0 3 50 parts, ZnO 20 parts, Ti0 2 l and Zr0 2 3 parts The above materials are uniformly mixed, placed in a porcelain crucible, dried in a digital blast drying oven at 135 ± 10 ° C for 1.5 h, placed in a high temperature furnace, and smelted at 1100 ° C. Minutes, dried after water quenching, then ball milled to below 8μηι, dried to obtain an inorganic binder;
2) 制备有机粘合剂： 按质量份取乙基纤维素 7份， 酚醛树脂 1.5份， 二乙二 醇单丁醚 13份， 松油醇 45份， 醇酯十二 8.5份， 丁基卡必醇醋酸酯 25份， 将上 述原料在反应釜内 100°C下溶解， 得到均一、 透明的有机粘合剂； 2) Preparation of organic binder: 7 parts of ethyl cellulose, 1.5 parts of phenolic resin, 13 parts of diethylene glycol monobutyl ether, 45 parts of terpineol, 8.5 parts of alcohol ester 12, butyl card 25 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
3 ) 铝粉： 类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι; 3) Aluminum powder: spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0μηι ;
4) 添加剂： 各种市售分散剂、 流平剂等。 按质量份 78份的铝粉， 0.1份的无机粘合剂， 18份的有机粘合剂， 3.9份的添 加剂混合均匀， 然后使用三辊研磨机进行研磨分散至细度 < 20μηι， 粘度 24000mPa-S, 得到方阻<60mΩ/□的局部铝背场晶体硅太阳电池专用铝浆产品。 实施例 4  4) Additives: Various commercially available dispersants, leveling agents, etc. 78 parts by mass of aluminum powder, 0.1 part of inorganic binder, 18 parts of organic binder, 3.9 parts of additive are uniformly mixed, and then ground and dispersed to a fineness < 20 μηι, viscosity 24000 mPa using a three-roll mill. S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance <60 mΩ/□. Example 4
1 )制备无机粘合剂： 按质量份取 Si02 10份， B2O320份， A12034份， PbO 45 份， ΖηΟ Π份， Ti023份和 Zr02 l份， 将上述原料混合均匀后， 装入瓷坩埚中， 在数显鼓风干燥箱中于 135±10°C干燥 3h后， 放入高温炉中， 于 900°C熔炼 70分 钟， 水淬后烘干， 然后球磨至 8μηι以下， 烘干得到无机粘合剂； 1) Preparation of Inorganic binder: parts by mass taken Si0 2 10 parts, B 2 O 3 20 parts, A1 2 0 3 4 parts, PbO 45 parts, ΖηΟ Π parts, Ti0 2 3 parts of Zr0 2 l parts, the After the above raw materials are uniformly mixed, they are placed in a porcelain crucible, dried in a digital blast drying oven at 135±10 ° C for 3 hours, placed in a high temperature furnace, smelted at 900 ° C for 70 minutes, and quenched after water quenching. Then ball milling to below 8μηι, drying to obtain an inorganic binder;
2) 制备有机粘合剂： 按质量份取乙基纤维素 5份， 酚醛树脂 0.5份， 二乙二 醇单丁醚 10份， 松油醇 35份， 醇酯十二 9.5份， 丁基卡必醇醋酸酯 40份， 将上 述原料在反应釜内 100°C下溶解， 得到均一、 透明的有机粘合剂；  2) Preparation of organic binder: 5 parts by weight of ethyl cellulose, 0.5 parts of phenolic resin, 10 parts of diethylene glycol monobutyl ether, 35 parts of terpineol, 9.5 parts of alcohol ester, butyl card 40 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
3 ) 铝粉： 类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι; 3) Aluminum powder: spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0μηι ;
4) 添加剂： 各种市售分散剂、 流平剂等。 按质量份 73份的铝粉， 3份的无机粘合剂， 23份的有机粘合剂， 1份的添加 剂混合均匀，然后使用三辊研磨机进行研磨分散至细度 <20μηι，粘度 28000mPa-S， 得到方阻<60mΩ/□的局部铝背场晶体硅太阳电池专用铝浆产品。 4) Additives: Various commercially available dispersants, leveling agents, etc. 73 parts by mass of aluminum powder, 3 parts of inorganic binder, 23 parts of organic binder, 1 part of additive are uniformly mixed, and then ground and dispersed to a fineness of <20 μηι, viscosity of 28000 mPa using a three-roll mill. S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance <60 mΩ/□.
实施例 5 Example 5
1 ) 制备无机粘合剂  1) Preparation of inorganic binders
按质量份取 Si02 13份， B20318份， A1203 3份， Bi20356份， ZnO 5份， Ti02 2份和 Zr023份， 将上述原料混合均匀后， 装入瓷坩埚中， 在数显鼓风干燥箱中于 135±10°C干燥 2h后， 放入高温炉中， 于 1000°C熔炼 50分钟， 水淬后烘干， 然后 球磨至 8μηι以下， 烘干得到无机粘合剂； According to the mass fraction, Si0 2 13 parts, B 2 0 3 18 parts, A1 2 0 3 3 parts, Bi 2 0 3 56 parts, ZnO 5 parts, Ti0 2 2 parts and Zr0 2 3 parts are mixed, and the above raw materials are uniformly mixed. , placed in a porcelain crucible, dried in a digital blast drying oven at 135 ± 10 ° C for 2 h, placed in a high temperature furnace, smelted at 1000 ° C for 50 minutes, dried after water quenching, and then ball milled to below 8 μηι Drying to obtain an inorganic binder;
2) 制备有机粘合剂： 按质量份取乙基纤维素 4份， 酚醛树脂 3份， 二乙二醇 单丁醚 8份， 松油醇 40份， 醇酯十二 10份， 丁基卡必醇醋酸酯 35份， 将上述原 料在反应釜内 100°C下溶解， 得到均一、 透明的有机粘合剂；  2) Preparation of organic binder: 4 parts of ethyl cellulose, 3 parts of phenolic resin, 8 parts of diethylene glycol monobutyl ether, 40 parts of terpineol, 12 parts of alcohol ester, 10 parts by weight, butyl card 35 parts of alcoholic acetate, the above raw materials were dissolved in a reaction vessel at 100 ° C to obtain a uniform, transparent organic binder;
3 ) 铝粉： 类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι; 3) Aluminum powder: spherical aluminum powder, purity greater than 99.90%, average particle size 2.0-6.0μηι ;
4) 添加剂： 各种市售分散剂、 流平剂等。  4) Additives: Various commercially available dispersants, leveling agents, etc.
按质量份 74份的铝粉， 1.8份的无机粘合剂， 21份的有机粘合剂， 3.2份的添 加剂混合均匀， 然后使用三辊研磨机进行研磨分散至细度 < 20μηι， 粘度 23000mPa-S, 得到方阻<60mΩ/□的局部铝背场晶体硅太阳电池专用铝浆产品。  According to the mass part of 74 parts of aluminum powder, 1.8 parts of inorganic binder, 21 parts of organic binder, 3.2 parts of the additive are uniformly mixed, and then ground and dispersed to a fineness < 20 μηι, viscosity 23000 mPa using a three-roll mill. S, a special aluminum paste product for a partial aluminum back field crystalline silicon solar cell with a square resistance <60 mΩ/□.
将上述实施例 1〜5获得的局部铝背场晶体硅太阳电池专用铝浆按局部铝背场 晶体硅太阳电池的生产工艺流程， 印刷于经制绒、 扩散、 镀膜后的单晶硅片上。 该铝浆流动性好， 能够很好的填充钝化膜上的孔洞或开槽， 且与硅基底形成良好 电池片的光电转换效率 20.0%， 将电池层压封装后， 经 The aluminum paste for the partial aluminum back field crystalline silicon solar cell obtained in the above embodiments 1 to 5 is printed on the monocrystalline silicon wafer after the texturing, diffusion and coating according to the production process of the partial aluminum back field crystalline silicon solar cell. . The aluminum paste has good fluidity, can well fill holes or slots in the passivation film, and forms well with the silicon substrate. The photoelectric conversion efficiency of the cell is 20.0%. After the battery is packaged and packaged,

Claims

权利要求 Rights request
1、 一种局部铝背场晶体硅太阳电池专用铝浆， 其特征在于： 由以下质量份配比的 原料制成： 70-80份的铝粉， 0.05-3份的无机粘合剂， 20-30份的有机粘合剂， 1-5 份的添加剂。 1. A special aluminum slurry for partial aluminum back field crystalline silicon solar cells, characterized by: Made of raw materials with the following mass proportions: 70-80 parts of aluminum powder, 0.05-3 parts of inorganic binder, 20 -30 parts of organic binder, 1-5 parts of additives.
2、 根据权利要求 1所述的局部铝背场晶体硅太阳电池专用铝浆， 其特征在于： 所 述铝粉为类球形铝粉， 纯度大于 99.90%， 平均粒度 2.0-6.0μηι。 2. The special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 1, characterized in that: the aluminum powder is spherical aluminum powder with a purity greater than 99.90% and an average particle size of 2.0-6.0 μm.
3、 根据权利要求 1所述的局部铝背场晶体硅太阳电池专用铝浆， 其特征在于： 所 述的无机粘合剂由以下质量份配比的原料制成： Si025-15份， B2O3 5-20份， A1203 1-6份， Bi203或 Pb035-65份， ZnO 5-20份， Ti02 1-3份和 Zr02 1-3份。 3. The special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 1, characterized in that: the inorganic adhesive is made of raw materials with the following mass proportions: Si0 2 5-15 parts, B 2 O 3 5-20 parts, A1 2 0 3 1-6 parts, Bi 2 0 3 or Pb035-65 parts, ZnO 5-20 parts, Ti0 2 1-3 parts and Zr0 2 1-3 parts.
4、 根据权利要求 1所述的局部铝背场晶体硅太阳电池专用铝浆， 其特征在于： 所 述有机粘合剂由以下质量份配比的原料制成： 乙基纤维素 4-10份， 酚醛树脂 0.5-3 份， 二乙二醇单丁醚 5-15份， 松油醇 35-45份， 醇酯十二 3-10份， 丁基卡必醇醋 酸酯 25-40份。 4. The special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 1, characterized in that: the organic binder is made of raw materials with the following mass proportions: 4-10 parts of ethyl cellulose , 0.5-3 parts of phenolic resin, 5-15 parts of diethylene glycol monobutyl ether, 35-45 parts of terpineol, 3-10 parts of alcohol ester, and 25-40 parts of butyl carbitol acetate.
5、 根据权利要求 1所述的局部铝背场晶体硅太阳电池专用铝浆， 其特征在于： 所 述助剂为各种市售分散剂和 /或流平剂。 5. The special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 1, characterized in that: the additives are various commercially available dispersants and/or leveling agents.
6、 一种权利要求 1所述的局部铝背场晶体硅太阳电池专用铝浆的制备方法， 包括 以下步骤： ( 1 ) 有机粘合剂的制备： 将组成有机粘合剂的原料在反应釜内溶解， 得到均 一、 透明的有机粘合剂； 6. A method for preparing special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 1, comprising the following steps: (1) Preparation of organic adhesive: Dissolve the raw materials constituting the organic adhesive in the reactor to obtain a uniform and transparent organic adhesive;
(2) 无机粘合剂的制备： 将组成无机粘合剂的原料混合均匀后， 装入瓷坩埚 中， 在数显鼓风干燥箱中干燥后， 放入高温炉中熔炼， 水淬后烘干， 然后球磨至 8μηι以下， 烘干得到无机粘合剂； (2) Preparation of inorganic binder: Mix the raw materials constituting the inorganic binder evenly, put them into a porcelain crucible, dry them in a digital blast drying oven, put them into a high-temperature furnace for smelting, quench with water and dry them. Dry, then ball mill to below 8 μm, and dry to obtain an inorganic binder;
(3 ) 将所述铝粉、 无机粘合剂、 有机粘合剂和添加剂混合均匀， 然后使用三 辊研磨机进行研磨分散至细度< 2(^1^ 粘度 15000-30000mPa_S， 得到方阻 <60ηιΩ/α的局部铝背场晶体硅太阳电池专用铝浆产品。 (3) Mix the aluminum powder, inorganic binder, organic binder and additives evenly, and then use a three-roller grinder to grind and disperse until the fineness is < 2(^1^ and the viscosity is 15000-30000mPa_S to obtain a sheet resistance < A special aluminum paste product for local aluminum backfield crystalline silicon solar cells with 60nmΩ/ α .
7、 根据权利要求 6所述的局部铝背场晶体硅太阳电池专用铝浆的制备方法， 其特 征在于： 所述步骤 （1 ) 中反应釜内的溶解温度为 80-120°C。 7. The method for preparing special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 6, characterized in that: the dissolution temperature in the reaction kettle in step (1) is 80-120°C.
8、 根据权利要求 6所述的局部铝背场晶体硅太阳电池专用铝浆的制备方法， 其特 征在于： 所述步骤（2) 中数显鼓风干燥箱中的干燥温度为 135±10°C， 干燥时间为 l-3h, 高温炉中的熔炼温度为 900-1100°C， 熔炼时间为 50-90分钟。 8. The method for preparing special aluminum paste for partial aluminum back field crystalline silicon solar cells according to claim 6, characterized in that: the drying temperature in the digital display blast drying oven in step (2) is 135±10° C, the drying time is 1-3h, the melting temperature in the high-temperature furnace is 900-1100°C, and the melting time is 50-90 minutes.
PCT/CN2013/086032 2013-07-29 2013-10-28 Aluminium paste dedicated for local aluminium back surface field crystalline silicon solar cell and preparation method therefor WO2015014032A1 (en)

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