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A special aluminum paste for partial aluminum back field crystalline silicon solar cells and preparation method thereof

A solar cell and aluminum back field technology, which is applied in cable/conductor manufacturing, circuit, photovoltaic power generation, etc., can solve the problems of passivation film damage, strong corrosion, poor contact of passivation film window on the surface of the battery, etc., and achieve improvement Good contact condition and fluidity

Active Publication Date: 2016-06-08
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solar cells with partial aluminum back field structure also put forward higher requirements for conductive aluminum paste. Conventional aluminum paste is too corrosive, which will cause serious damage to the passivation film on the surface of the battery; and conventional aluminum paste cannot be well Fill the perforation or groove on the passivation film, and cannot form a good ohmic contact with the silicon substrate, that is, poor contact with the passivation film window

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of inorganic binder: take SiO in parts by mass 2 15 copies, B 2 o 3 20 copies, Al 2 o 3 6 copies, Bi 2 o 3 35 parts, ZnO20 parts, TiO 2 3 parts and ZrO 2 1 part, after mixing the above raw materials evenly, put it into a porcelain crucible, dry it in a digital blast drying oven at 135±10°C for 2 hours, put it in a high-temperature furnace, melt it at 900°C for 70 minutes, quench it with water and bake it dry, then ball milled to below 8 μm, and dried to obtain an inorganic binder;

[0021] 2) Preparation of organic adhesive: 7.5 parts by mass of ethyl cellulose, 2.5 parts of phenolic resin, 12 parts of diethylene glycol monobutyl ether, 39 parts of terpineol, 3 parts of alcohol ester twelve, butyl carboxylate 36 parts of benzyl alcohol acetate, the above-mentioned raw materials were dissolved at 100°C in the reactor to obtain a uniform and transparent organic adhesive;

[0022] 3) Aluminum powder: almost spherical aluminum powder, the purity is g...

Embodiment 2

[0026] 1) Preparation of inorganic binder: take SiO in parts by mass 2 15 copies, B 2 o 3 5 copies, Al 2 o 3 1 part, PbO65 parts, ZnO10 parts, TiO 2 2 parts and ZrO 2 2 parts, after mixing the above raw materials evenly, put them into a porcelain crucible, dry them in a digital blast drying oven at 135±10°C for 2 hours, put them in a high-temperature furnace, melt them at 1000°C for 50 minutes, quench them with water and bake them dry, then ball milled to below 8 μm, and dried to obtain an inorganic binder;

[0027] 2) Preparation of organic adhesive: take 10 parts by mass of ethyl cellulose, 1 part of phenolic resin, 14 parts of diethylene glycol monobutyl ether, 40 parts of terpineol, 10 parts of alcohol ester twelve, butyl carboxylate 25 parts of benzyl alcohol acetate, the above-mentioned raw materials are dissolved in the reaction kettle at 100°C to obtain a uniform and transparent organic adhesive;

[0028] 3) Aluminum powder: almost spherical aluminum powder, the...

Embodiment 3

[0032] 1) Preparation of inorganic binder: take SiO in parts by mass 2 5 copies, B 2 o 3 15 copies, Al 2 o 3 6 copies, Bi 2 o 3 50 parts, ZnO20 parts, TiO 2 1 part and ZrO 2 3 parts, after mixing the above raw materials evenly, put them into a porcelain crucible, dry them in a digital blast drying oven at 135±10°C for 1.5h, put them in a high-temperature furnace, melt them at 1100°C for 80 minutes, and quench them with water Drying, then ball milling to below 8 μm, and drying to obtain an inorganic binder;

[0033] 2) Preparation of organic adhesive: 7 parts by mass 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 twelve, butyl carboxylate 25 parts of benzyl alcohol acetate, the above-mentioned raw materials are dissolved in the reaction kettle at 100°C to obtain a uniform and transparent organic adhesive;

[0034] 3) Aluminum powder: almost spherical aluminum powder, the ...

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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

technical field [0001] The invention relates to an aluminum paste specially used for partial aluminum back field crystal silicon solar cells, and at the same time, the invention also relates to a preparation method of the paste. Background technique [0002] A solar cell is a device that directly converts solar radiation 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. Improving the conversion efficiency of solar cells is mainly carried out from two aspects: one is the optical aspect, which continuously improves the absorption of incident light by various means to generate more photogenerated carriers; the other is the electrical aspect, which minimizes the photogenerated charge. The recombination of carriers in the body and surface of the battery reduces various resistance losses and enables more electrical energy to be output to external loads. [0003] Pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01L31/02167H01L31/022425H01L31/1868Y02E10/50Y02P70/50
Inventor 刘细莲丁冰冰马进
Owner GUANGZHOU RUXING TECH DEV
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