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Conductive aluminum paste for back passivation solar cell and preparation method thereof

A technology for solar cells and aluminum paste, applied in the field of solar cells, can solve problems such as aluminum back field shedding, and achieve the effects of reducing defective product rate, avoiding bad appearance and good dispersion performance

Active Publication Date: 2017-11-07
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the back passivation cell has a layer of SiNx / Al between the aluminum back field and the silicon material 2 o 3 Passivation layer, during the sintering process of the back passivation aluminum paste, the aluminum paste cannot form a good silicon-aluminum contact with the silicon material, and the aluminum back field may fall off after the assembly is manufactured

Method used

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  • Conductive aluminum paste for back passivation solar cell and preparation method thereof
  • Conductive aluminum paste for back passivation solar cell and preparation method thereof

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Experimental program
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Effect test

Embodiment 1～5

[0030] A kind of conductive aluminum paste for back passivation solar cell, the composition of this conductive aluminum paste weight percentage is as shown in table 1;

[0031] Table 1

[0032]

[0033]In the above-mentioned implementation 1, the tension additive is tetraethyl orthosilicate; in embodiment 2, the tension additive is silicone resin; in embodiment 3, the tension additive is trapezoidal polyorganosilsesquioxane; implementation In Example 4, the tension additive is a ring ladder polyphenylsilsesquioxane; in Example 5, the tension additive is a polyphenylsilsesquioxane ladder polymer; in Example 6, the The tension additive is double-chain ladder poly(1,3-dimethyl-1,3-dioxodisiloxane);

[0034] In above-mentioned embodiment 1~6, described organic vehicle comprises the composition of following percentage by weight: hydroxypropyl methylcellulose 8%, organic solvent 85%, dispersant 4%, leveling agent 3%; Described organic solvent is Diethylene glycol butyl ether; t...

Embodiment 7

[0039] The tension additive is tetraethyl orthosilicate, polyphenylsilsesquioxane ladder polymer and double-chain ladder poly(1,3-dimethyl-1,3- Dioxodisiloxane), it is exactly the same with process parameter and process engineering and embodiment 1.

Embodiment 8

[0041] The tension additive is ladder polyorganosilsesquioxane, orthosilicate, ring ladder polyphenylsilsesquioxane and double chain ladder poly(1, 3-Dimethyl-1,3-dioxodisiloxane). It is identical with process parameter and process engineering and in embodiment 1.

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Abstract

The invention discloses a conductive aluminum paste for a back passivation solar cell. The conductive aluminum paste comprises various components having following weight percentages: 70-80% aluminum powder, 0.5-5% inorganic glass, a 1-15% organic carrier and a 0.1-10% tensile force additive. The tensile force additive is uniformly dispersed in the conductive aluminum paste, molecular bridges can be built between interfaces of inorganic and organic substances when the conductive aluminum paste is sintered, and the two kinds of materials with great disparity in nature are connected together to improve performance of a composite material and increase bonding strength, so a tensile force of the conductive aluminum paste is formed in the condition that a back field passivation layer is not damaged, the process defective rate of follow-up assemblies is reduced then, and photoelectric conversion efficiency of the cell is improved.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a conductive aluminum paste for back passivation solar cells and a preparation method thereof. Background technique [0002] Due to the large ratio of surface area to volume of crystalline silicon solar cells, the surface recombination is serious. In addition, there are a large number of impurities and defects in the body of conventional crystalline silicon solar cells, and these impurities and defects will act as recombination centers, increasing the recombination rate, surface recombination and impurity defects. Will significantly affect the performance of solar cells. Therefore, reducing surface recombination and impurity recombination is a key issue to further improve the efficiency of crystalline silicon cells. This project adopts back aluminum passivation technology, on the basis of the original traditional all-aluminum back field structure, a layer of SiNx / Al is add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022425Y02E10/50
Inventor 敬波左伟力王红曾国平何毅李运钧
Owner SICHUAN YINHE CHEM
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