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A kind of conductive paste for solar cell and preparation method thereof

A technology of conductive paste and weight percentage, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as reducing the welding performance of silver electrodes and photovoltaic ribbons, and achieve The effect of good surface condition, excellent electrical properties and welding performance

Active Publication Date: 2016-08-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point of the additive powder in the paste is over 1000°C, and it is added to the conductive paste as an additive alone, rather than as a component of glass powder. At the sintering temperature of the positive electrode (about 900°C), this type of The additive will not melt, but exists as a heterogeneous phase in the silver-lead-glass three-phase, which is not beneficial to improve the adhesion between the electrode and the silicon bottom layer, and this type of heterogeneous substance may float on the silver layer during sintering, The surface of the silver electrode will contain impurities of the additive, thus reducing the welding performance of the silver electrode and the photovoltaic ribbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a method for preparing an organic carrier for conductive paste, comprising the steps of: adding thermoplastic styrene-butadiene block copolymer, phytic acid, and additives into a mixed solvent, dissolving, and stirring to obtain the organic carrier provided by the invention carrier. Specifically, it can be described as: adding a certain amount of thermoplastic styrene-butadiene block copolymer (SBS), phytic acid, and additives into a mixed solvent, dissolving at 60-80°C, and stirring evenly to obtain a uniform organic carrier solution .

[0022] The present invention also provides a method for preparing conductive paste for solar cells, comprising the steps of: adding thermoplastic styrene-butadiene block copolymer, phytic acid, and additives into a mixed solvent, dissolving, stirring, to obtain an organic carrier, and mixing silver powder and glass powder are mixed in the above-mentioned organic carrier, stirred and ground to obtain the conducti...

Embodiment 1

[0026]This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0027] Step 1: Preparation of glass powder

[0028] Take 75wt% of PbO, 9wt% of SiO 2 , 11wt% of B 2 o 3 , 5wt% ZnO, mixed evenly with a V-type mixer, put it into a porcelain crucible, put it into a silicon carbide rod furnace, preheat it to 550°C, keep it for 0.5h, then raise it to 1250°C, melt it for 1.0h, and quench it in water Filter, put the obtained glass beads into a ball mill tank, control the mass ratio, zirconia ball: glass beads: deionized water = 4:1:0.5, tank speed 300 / min, ball mill for 7 hours, filter, dry, and get medium particles Diameter D 50 1.25μm, glass powder with a softening point of 500°C, set aside;

[0029] Step 2: Configuration of organoids

[0030] According to the mass ratio of terpineol butyl carbitol acetate: tributyl citrate: dibutyl phthalate (DBP): butyl carbitol=50:30:10:10 organic solvents are mixed e...

Embodiment 2

[0034] Except changing the content of silver powder into 91wt% in step 3 in Example 1, changing the content of the organic vehicle into 8.8wt%, changing the content of glass powder into 0.2wt%, all the other are the same as in Example 1, and obtain the solar cell positive electrode. Conductive paste S2.

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PUM

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Abstract

The invention provides conductive slurry for a solar cell. The conductive slurry comprises sliver powder, glass powder and organic carrier. The organic carrier comprises thermoplastic butylbenzene segmented copolymer, auxiliary agent, phytic acid and mixed solvent. The invention also provides an organic carrier preparation method for the conductive slurry. The method comprises the following steps of: adding the thermoplastic butylbenzene segmented copolymer, the phytic acid and the auxiliary agent to the mixed solvent, dissolving, stirring, and obtaining the organic carrier. The invention further provides a preparation method of the conductive slurry for the solar cell, wherein the preparation method comprises the following steps of: mixing the sliver powder and the glass powder in the organic carrier, stirring, grinding, and obtaining the conductive slurry of the invention. According to the invention, the conductive slurry for the solar cell is applied to the solar cell positive electrode; the surface status is great; and the electrical property and the performance are excellent.

Description

technical field [0001] The invention relates to the technical field of conductive paste for solar cells, in particular to a silver conductive paste for front electrodes of crystalline silicon solar cells and a preparation method thereof. Background technique [0002] At present, crystalline silicon solar cells have developed rapidly as the main solar photovoltaic power generation unit. As an important part of the solar cell, the conductive silver paste on the front of the solar cell, the contact resistance between the electrode and the silicon wafer, the conductivity of the electrode itself, and the aspect ratio of the electrode have a direct impact on its photoelectric conversion efficiency, which has become a major factor in this industry. One of the research directions. In addition, the welding performance of the electrode and the photovoltaic ribbon is also an important indicator for evaluating the quality of the silver paste. [0003] At present, the mainstream method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00H01L31/0224
Inventor 谭伟华徐翔姜占锋
Owner BYD CO LTD