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High-activity low-series-resistance N-type solar cell silver paste and preparation method thereof

A solar cell, high-activity technology, applied in the direction of cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of open voltage, contact resistance, grid line resistance, etc., to increase electrical conductivity rate, reduce carbon residue, and reduce the effect of softening temperature

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

[0005] Domestic patents mainly focus on the structure and passivation of N-type batteries, and a large number of fruitful research and work have been carried out. The reports on N-type solar battery silver paste mainly focus on the introduction of aluminum powder to reduce paste costs and reduce ohmic contact. However, from a large number of research literature and the use of existing products: the content and particle size of aluminum powder (that is, the activity of aluminum powder) affect the recombination and series resistance on the surface of silicon wafers, resulting in open voltage and contact resistance problems; And aluminum powder and silver powder need a lot of energy in the battery sintering process, which makes the resistance of the grid line larger and a series of problems. The most important problem is the contradiction between ohmic contact and opening voltage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A kind of preparation method of N-type solar cell silver paste with high activity and low serial resistance, the method comprises the following steps:

[0081] (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 particle size D50=0.3-3 microns;

[0082] (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;

[0083] (3) Preparation of battery silver paste: the weight percentage of th...

Embodiment 2

[0087] A kind of preparation method of N-type solar cell silver paste with high activity and low serial resistance, the method comprises the following steps:

[0088] (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 deionized 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;

[0089] (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;

[0090] (3) Prepare battery positive silver paste: the silver-containing mixture is 90% ...

Embodiment 3

[0094] A kind of preparation method of N-type solar cell silver paste with high activity and low serial resistance, the method comprises the following steps:

[0095] (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;

[0096] (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 ;

[0097] (3) Prepare battery positive silver paste: the si...

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Abstract

The present invention provides a high-activity low-series-resistance N-type solar cell silver paste and the preparation method thereof. The high-activity low-series-resistance N-type solar cell silver paste is prepared by doping an organic aluminum compound, combining a glass powder component design, adding a silver-containing mixture, optimizing a paste formula and the like, so that the N-type solar cell silver paste containing the organic aluminum compound is prepared. By adding the organic aluminum compound and the silver-containing mixture, the activity of an aluminum source is improved, the activity of conductive metal and the energy of reaction with silicon in the reaction process are enhanced through silver powder and silver nitrate, the contact resistance of a metal grid line and a cell can be reduced, high open voltage is kept, and the efficient solar cell silver paste raw material is obtained; and the purpose of improving the conversion efficiency of the 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 N-type solar cell silver paste with high activity and low series resistance 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. Since silicon-based solar cells were invented and applied, they will continue to occupy a dominant position in the photovoltaic market in the next few decades. Due to the advantages of simple manufacturing process and low cost, the vast majority of silicon-based solar cells currently 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 life (generally 1-2 orders of magnitude higher than p-type silicon), excellent weak light response, and stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00H01L31/0224C03C12/00C03C8/24
CPCH01B1/22H01B1/16H01B13/00H01L31/022425C03C12/00C03C8/245C03C8/24Y02E10/50
Inventor 许亚文张长根彭平卢美军
Owner JIANGXI JIAYIN SCI & TECH LTD