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N-type solar cell silver paste doped with organic gallium and preparation method thereof

A technology of solar cells and organic gallium, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve problems such as increased surface recombination, VOC reduction, poor conductivity, etc., to reduce contact potential energy , lower the softening temperature, and increase the doping solubility

Active Publication Date: 2021-05-11
JIANGXI JIAYIN SCI & TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic and foreign patents and literature research reports on N-type solar cell silver paste mainly focus on the introduction of aluminum powder, aluminum-silicon alloy and other aluminum alloy substances to reduce the ohmic contact improvement, but from a large number of research literature and existing product testing and use : The content and particle size of aluminum powder have a great influence on the compounding of silicon wafer surface
If through some methods, such as increasing the content of aluminum powder, in the case of reducing Rs, VOC will also be reduced correspondingly. This is mainly because Al reacts with silicon on the surface of the battery during the reaction process to form Al nails and destroy the PN-junction. Integrity or even burning through the PN-junction, increasing its surface recombination, resulting in a decrease in VOC; and a series of problems such as the conductivity of aluminum powder is worse than that of silver powder, which increases the line resistance of the grid line. The most important problem is that Contradiction between ohmic contact and opening voltage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] A preparation method of N-type solar cell silver paste doped with organic gallium, the method may further comprise the steps:

[0084] (1) Preparation of glass powder: take 10 parts of B by mass parts 2 o 3 , 5 parts of SiO 2 , 20 copies of Bi 2 o 3 , 5 parts of ZnO 2 , 57 parts of PbO and 3 parts of Sb 2 o 3 , mixed evenly with a mixer, put into a crucible, put into a muffle furnace, at 1000 ° C, holding time: 60 minutes, quench the melted glass powder particles with deionized water, ball mill for 2.5 hours, and pass through a 400-mesh sieve Obtain glass sticky powder with a particle size of D50 = 0.3-3 microns;

[0085] (2) Preparation of organic binder: Weigh 8 parts of polymethacrylate and 92 parts of butyl carbitol in parts by mass, mix them, disperse on a disperser for 60 minutes, disperse and dissolve, and obtain a transparent and uniform organic binder agent;

[0086] (3) Preparation of battery silver paste: the mixed silver powder weight percent is 85%...

Embodiment 2

[0090] A preparation method of N-type solar cell silver paste doped with organic gallium, the method may further comprise the steps:

[0091] (1) Preparation of glass powder: take 15 parts of B by mass parts 2 o 3 , 2 parts of Al 2 o 3 , 10 parts of Sb 2 o 3 , 13 copies of Bi 2 o 3 , 20 copies of V 2 o 5 and 40 parts of BaO; mixed evenly with a mixer, put into a crucible, put into a muffle furnace, at 900 ° C, holding time: 90 minutes, quench the melted glass powder particles with ionized water, and ball mill for 5 hours , through a 400-mesh sieve to obtain glass sticky powder with a particle size of D50 = 0.3 to 3 microns;

[0092] (2) Preparation of organic binder: 11 parts of ethyl cellulose and 89 parts of terpineol were weighed and mixed in parts by mass, and dispersed on a disperser for 60 minutes to obtain a transparent and uniform organic binder;

[0093](3) Prepare battery positive silver paste: the mixed silver powder is 90% micron silver powder and 10% nan...

Embodiment 3

[0097] A preparation method of N-type solar cell silver paste doped with organic gallium, the method may further comprise the steps:

[0098] (1) Preparation of glass powder: take 15 parts of B by mass parts 2 o 3 , 2 parts of Al 2 o 3 , 10 parts of Sb 2 o 3 , 10 parts of ZnO, 13 parts of Bi 2 o 3 , 20 copies of V 2 o 5 and 30 parts of BaO; mixed evenly with a mixer, put into a crucible, put into a muffle furnace, at 1200 ° C, holding time: 45 minutes, quench the melted glass powder particles with ionized water, and ball mill for 6 hours , through a 400-mesh sieve to obtain glass sticky powder with a particle size of D50 = 0.3 to 3 microns;

[0099] (2) Preparation of organic binder: Weigh 13 parts of ethyl hydroxyethyl cellulose and 87 parts of tributyl citrate in parts by mass, mix them, and disperse on a disperser for 60 minutes to obtain a transparent and uniform organic binder ;

[0100] (3) Prepare battery positive silver paste: the mixed silver powder is 90% ...

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Abstract

The present invention provides an N-type solar cell silver paste doped with organic gallium and the preparation method thereof, the N-type solar cell silver paste free of aluminum powder is prepared by doping organic gallium, combining the composition design of the glass powder, adding the nano silver powder, optimizing the formula of the paste and the like, damage of the aluminum powder to PN junctions is reduced, meanwhile, due to introduction of the organic gallium, the doping concentration is improved, contact is reduced, high open voltage is kept, the efficient solar cell silver paste raw material is obtained, and the purpose of improving the conversion efficiency of a solar cell is achieved.

Description

technical field [0001] The invention relates to a solar cell silver paste and a preparation method thereof, in particular to an organic gallium-doped N-type solar cell silver paste and a preparation method thereof, belonging to the technical field of solar cell silver paste. Background technique [0002] Solar energy is a kind of renewable clean energy, which is more and more favored by people. Silicon-based solar cells have always dominated the photovoltaic market. At present, the vast majority of silicon-based solar cells on the market are still p-type cells, but the efficiency of existing p-type cells has very limited room for improvement so far; N-type silicon has a higher minority carrier lifetime (generally 1 higher than p-type silicon) -2 orders of magnitude), excellent weak light response, and strong tolerance to metal impurities, so N-type batteries can achieve higher efficiency, and the power attenuation of N-type batteries is much lower than that of conventional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022425
Inventor 许亚文卢美军
Owner JIANGXI JIAYIN SCI & TECH LTD
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