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Conductive adhesive composition for solar cell and solar cell assembly thereof

A technology of solar cells and conductive adhesives, applied in conductive materials, electrical components, semiconductor devices and other directions dispersed in non-conductive inorganic materials, can solve the problems of difficult welding, inconvenience, lack of glue, etc., to improve industrial competitiveness, reduce cost effect

Inactive Publication Date: 2012-10-10
ETERNAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, with the development of the solar cell industry in recent years, the price of related materials used in solar cells has increased with the increase in demand, especially the silver particles used for conductivity. However, in order to reduce costs, reduce the wire If the printing volume is small, the conductive effect is not good, which will affect the efficiency of power generation, and the screen printing characteristics will be affected by the development, resulting in glue shortage.
If the weight ratio of silver particles in the conductive composition is reduced, the electrical conductivity will be poor, and the connection interface between silver particles, glass frit and silicon wafer will be reduced, resulting in decreased tensile force or difficulties in soldering.
[0005] It can be seen that the above-mentioned existing conductive adhesive composition for solar cells obviously still has inconvenience and defects in product structure, manufacturing method and use, and needs to be further improved urgently.
In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

Method used

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  • Conductive adhesive composition for solar cell and solar cell assembly thereof
  • Conductive adhesive composition for solar cell and solar cell assembly thereof
  • Conductive adhesive composition for solar cell and solar cell assembly thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] Manufacture of conductive adhesive composition

[0048] The preparation of the conductive adhesive composition of the present invention includes adding (d) solvent (A: terpineol; B: diethylene glycol monobutyl ether) to silver particles with an average particle diameter (D50) of 0.5-1.3um and glass frit ) and the organic binder, if necessary, add the dispersant (e), the proportion of which is shown in Table 1 and Table 2, and pre-mixed with a mixer.

[0049] The appearance and morphology of spherical silver particles (a1), flake silver particles (a2) and irregular silver particles (a3) ​​were analyzed by electron microscope. The analysis results are as follows figure 2 shown.

[0050] (b) The glass frit has Tg=430°C and contains 40wt% bismuth oxide, silicon oxide and boron oxide composition.

[0051] (c) The organic binder is ethyl cellulose resin.

[0052] After mixing, the conductive adhesive composition including silver particles (a), glass frit (b), organic bind...

Embodiment 8

[0069] The main difference between embodiment 8 and embodiments 1-7 is (d) solvent. Wherein the mark A represents terpineol; B represents diethylene glycol monobutyl ether, the change of the conductive adhesive composition (d) the solvent will not affect the power generation efficiency and the pulling force data, and the conductive adhesive composition of the present invention can use any technology The well-known solvents in the world are not limited to the types of solvents mentioned in the present invention, and will not affect the reliability of solar cells.

[0070] In addition, only the weight of (a) silver particles relative to the weight of (b) glass frit differs between Example 4 and Comparative Examples 4-5. It can be seen from Comparative Example 4 that when the weight of (a) silver particles is 10.11 relative to the weight of (b) glass frit, the tensile data performance is slightly lower than that of Example 4, but the welding ability is still judged to be good, bu...

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Abstract

The invention relates to a conductive adhesive composition for a solar cell, including (a) conductive particles composed of silver particles; (b) glass material; (c) organic cement; and (d) solvent, wherein (a) silver particles includes at least two particles selected from the group composed of spherical, irregular, and flake particles or only irregular particles, wherein the ratio of the weight of (a) the silver particles to the weight of the (b) glass material is in the range of 10.4-15.9, with respect to 100 parts by weight of the conductive adhesive composition, the conductive adhesive composition includes 30-65 parts by weight of solid content (a)+(b). The invention further provides a solar cell assembly includes an electrode or a lead wire by burning the conductive adhesive composition. The conductive adhesive composition can ensure the properties of the electrode or lead wire under the condition of reducing the weight proportion of the silver particles in the conductive adhesive composition, thereby reducing costs and improving industrial competition.

Description

technical field [0001] The invention relates to a conductive adhesive composition, in particular to a conductive adhesive composition used for back electrodes or wires of solar cells. Background technique [0002] Due to the soaring international oil prices and the rising awareness of environmental protection, in recent years, countries around the world have actively invested in research and development to seek renewable energy technologies that can replace traditional energy sources (including non-renewable energy sources such as petroleum). Among them, the development of solar energy technology has attracted the most attention. [0003] Among the various technologies of solar energy, solar cell technology, which converts sunlight into electrical energy storage, is widely used. In recent years, the development of related technologies has become more controversial. At present, the most widely used solar cell is semiconductor material (such as silicon substrate) solar energy. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224H01L31/18
CPCY02P70/50
Inventor 詹靖仪许再发陈文亿蔡孟宏
Owner ETERNAL MATERIALS CO LTD
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