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A kind of positive electrode silver paste, silver powder for solar cell and preparation method thereof

A technology for solar cells and front electrodes, which is used in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of difficult control of sintering effect and cell efficiency, complicated formula design, and cumbersome process development routes. and other problems, to achieve the effect of improving conductivity, controllable particle size range, and good dispersion effect.

Active Publication Date: 2020-12-15
SUZHOU ISILVER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the prior art only involves the modification of the inorganic phase design of the front electrode silver paste, the design of the conductive phase components, etc., and does not improve the performance of the front electrode silver paste from the perspective of the structure of the conductive phase itself. The improvement of the slurry system requires complex formula design, cumbersome process development routes, difficult to control the sintering effect and battery efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for preparing the silver paste and silver powder for the front electrode of a solar cell. The method for preparing the silver powder is as follows:

[0038] Prepare 1 L of silver fluoride aqueous solution with a concentration of 0.1 mol / L, add carboxymethyl cellulose to it, and dropwise add HF aqueous solution to adjust the pH to 3.5, stir and sonicate for 30 minutes, the ultrasonic frequency is 5KHZ, and the stirring speed is 2000r / min. Obtain silver fluoride dispersion liquid, the percentage of described carboxymethyl cellulose mass accounting for silver fluoride mass is 1wt%;

[0039] Prepare 1 L of ascorbic acid aqueous solution with a concentration of 0.11mol / L, and add HF aqueous solution dropwise to adjust the pH to 3.5;

[0040] At a temperature of 20°C, add the ascorbic acid aqueous solution to the silver fluoride dispersion at one time, stir during the addition (stirring speed is 2000r / min), and stop stirring for 3 minutes aft...

Embodiment 2

[0052] This embodiment provides a method for preparing the silver paste and silver powder for the front electrode of a solar cell. The method for preparing the silver powder is as follows:

[0053] Prepare 1L of silver nitrate aqueous solution with a concentration of 0.3mol / L, add polyvinylpyrrolidone to it, and add HNO dropwise 3 Adjust the pH to 3, stir and sonicate for 20 minutes, the ultrasonic frequency is 40KHZ, and the stirring speed is 500r / min to obtain a silver nitrate dispersion, and the percentage of the polyvinylpyrrolidone mass in the silver nitrate mass is 10wt%;

[0054] Prepare 1L of ferrous sulfate aqueous solution with a concentration of 0.35mol / L, add HNO dropwise 3 Adjust the pH to 3;

[0055] At a temperature of 25°C, add the ferrous sulfate aqueous solution to the silver nitrate dispersion at one time, stir during the addition (stirring speed is 500r / min), and stop stirring for 5 minutes after the ferrous sulfate aqueous solution is added. ;

[0056] ...

Embodiment 3

[0066] This embodiment provides a method for preparing the silver paste and silver powder for the front electrode of a solar cell. The method for preparing the silver powder is as follows:

[0067] Prepare 1L of silver nitrate aqueous solution with a concentration of 0.5mol / L, add hexadecyltrimethylammonium bromide to it, and add HNO dropwise 3 Adjust the pH to 3, stir and sonicate for 30 minutes, the ultrasonic frequency is 10KHZ, and the stirring speed is 1000r / min to obtain a silver nitrate dispersion, and the mass of cetyltrimethylammonium bromide accounts for 8wt% of the silver nitrate ;

[0068] Prepare 1 L of hydrazine hydrate solution with a concentration of 0.55 mol / L, add HNO dropwise 3 Adjust the pH to 3;

[0069] At a temperature of 25°C, add the hydrazine hydrate solution to the silver nitrate dispersion at one time, stir during the addition (stirring speed is 1000r / min), and stop stirring for 10 minutes after the hydrazine hydrate solution is added;

[0070] A...

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PUM

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Abstract

The invention relates to a front electrode silver paste for a solar battery, a silver powder and a preparation method thereof. The method for preparing silver powder includes such steps as adding acidic reducing agent solution into soluble silver salt dispersion, stirring in that process of adding, standing for 3-10 min after adding a reaction solution, adding silver powder to obtain silver paste,, and preparing silver paste. Then stirring the reaction solution and reacting with ultrasonic until the silver powder, and performing post-treatment on the reaction solution to obtain silver powder;The silver paste is prepared by adding silver powder and glass powder into organic solvent and coupling agent for pretreatment respectively, adding modified silver powder and modified glass powder into organic carrier for mixing, grinding and filtering to obtain silver paste for front electrode. The silver powder prepared by the invention has the advantages of simple process, irregular sphericalshape with uneven surface and high sintering activity. The prepared silver paste has low sintering temperature and excellent solderability, and can effectively reduce the contact resistance after sintering and improve the conductive efficiency.

Description

technical field [0001] The invention relates to a front electrode silver paste and silver powder for a solar cell and a preparation method thereof, belonging to the technical field of electronic materials. Background technique [0002] Crystalline silicon solar cells are currently the most widely used solar cells. Metallized electrodes are the key materials of crystalline silicon solar cells, especially the front gate material, which directly affects the photoelectric conversion efficiency, fill factor, series resistance and other performance indexes of solar cells. Electrode silver paste is the key material of crystalline silicon solar cell electrodes and grid line film, which plays the role of drawing out electrodes and collecting current in solar cells. The performance of electrode silver paste will greatly affect the photoelectric conversion efficiency of solar cells , and directly determines the service life and attenuation of the battery. [0003] The front electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B1/16H01B1/22H01B5/00H01B13/00H01L31/0224
CPCH01B1/02H01B1/16H01B1/22H01B5/00H01B13/00H01L31/022425Y02E10/50
Inventor 苑红周欣山汪山孙达
Owner SUZHOU ISILVER MATERIALS
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