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Conductive paste for solar cells and preparation method thereof

A solar cell and conductive paste technology, applied in the field of solar cells, can solve problems such as low welding strength, decreased battery performance, and reduced density, and achieve the effects of high welding strength, improved battery performance, and enhanced adhesion

Active Publication Date: 2016-03-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the existing conductive paste will cause more pores in the alloy layer formed by silicon and conductive metal, the density will decrease, the performance of the battery will decrease, and the adhesion with the silicon layer and the welding strength with the welding strip will not be high. A kind of conductive paste with low sintering temperature and a preparation method thereof, which does not cause bridging phenomenon during the preparation and sintering process, and has greatly improved adhesion to the silicon layer and welding strength with the solder strip.

Method used

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  • Conductive paste for solar cells and preparation method thereof
  • Conductive paste for solar cells and preparation method thereof
  • Conductive paste for solar cells and preparation method thereof

Examples

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preparation example Construction

[0021] Simultaneously, the present invention provides the preparation method of above-mentioned conductive paste for solar cell, and the step comprises:

[0022] S1. Mix the solution containing metal nitrate with the mixture of silicate and borate under the condition of pH = 0.5-2 to obtain a gel system; the mixing method of the present invention is not particularly limited, and various methods known to those skilled in the art can be used. For example, the acid can be mixed with the metal nitrate first, and then mixed with the mixture of silicate and borate to control the mixing rate, ensure the pH value of the reaction system, and form a uniform gel system. Mix the acid with the mixture of silicate and borate, control the pH value of the reaction system, react for 1 to 2 hours, hydrolyze part of the silicate and borate in advance, and then add metal nitrate under the condition of stirring and heating , add acid at the same time, control the pH value of the reaction system, a...

Embodiment 1

[0034] To the glossy silver conductive paste.

[0035] (1) Preparation of inorganic glass powder

[0036] According to the mass ratio of nitric acid (concentration: 50wt%): glacial acetic acid (concentration: 99.5wt%): deionized water = 1:1:100 dilution, to obtain a mixed acid solution.

[0037] Take by weighing 55 parts by mass of bismuth nitrate, 8 parts by mass of zinc nitrate, and 5 parts by mass of aluminum nitrate, add deionized water to dissolve and stir evenly, the amount of deionized water is 2.5 times of the total amount of metal nitrate, to obtain metal nitrate aqueous solution.

[0038] Weigh 20 parts by mass of butyl borate and 12 parts by mass of ethyl silicate, add ethanol according to the mass sum of ethyl silicate and butyl borate: ethanol = 1:2, mix and stir evenly.

[0039] Add mixed acid dropwise to the mixed solution of ethyl silicate, butyl borate and metal nitrate aqueous solution, and stir evenly to make the pH of the solution 1.5. The stirring time i...

Embodiment 2

[0046] Silver conductive paste for glossy surface

[0047] The same method as in Example 1 was used to prepare the glossy silver conductive paste, except that mixed acid was added dropwise in the preparation of the inorganic glass powder to make the pH of the gel reaction system 0.5.

[0048] Adopt the method identical with embodiment 1 to test inorganic glass powder, record the medium particle diameter D of the inorganic glass powder of preparation 50 123.2nm, D 10 at 26.2nm, D 90 At 482.6nm, the specific gravity of the glass powder is 6.79, and the softening point is 414°C.

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Abstract

The invention provides electrocondution slurry for a solar cell and a manufacturing method of the electrocondution slurry. The electrocondution slurry comprises electrocondution metal powder, inorganic glass powder and an organic carrier. D50 of the inorganic glass powder is 100-300nm, D10 of the inorganic glass powder is 10-70nm, and D90 of the inorganic glass powder is 400-700nm. The inorganic glass powder is manufactured through a sol-gel method, glass powder with a particle size smaller than 1 micron is obtained accidentally, the size distribution of the glass powder is even, and meanwhile doping is even. The manufactured electrocondution slurry is free of a cross phenomenon in the process that the solar cell is manufactured and sintered, the adhesive force of the electrocondution slurry and a silicon layer and the welding strength of the electrocondution slurry and a welding belt are greatly improved, and sintering temperature is low.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a conductive paste for solar cells and a preparation method thereof. Background technique [0002] With the depletion of traditional energy sources and the aggravation of environmental pollution, the development and application of new energy sources has become a hot spot in human research. Inexhaustible, green and pollution-free solar energy is one of the key points in the development and utilization of new energy. [0003] Conductive paste is an important material for making silicon-based solar cells. Silicon-based solar cells are generally prepared by printing a conductive paste on a silicon substrate, followed by drying and sintering to prepare the back field and electrodes. The existing conductive paste is mainly formed by mixing, stirring and rolling functional powder (metal powder), inorganic glass powder and organic carrier. The metal powder is generally silver powd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
Inventor 谭伟华陈东锋管玉龙
Owner BYD CO LTD
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