Silicon solar battery front silver paste with wide high-temperature sintering window

A high-temperature sintering, silver paste technology, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of no proposed paste high-temperature sintering window performance, unreasonable temperature range setting, high-temperature sintering The problem of narrow window, etc., can increase the viscosity, reduce the ratio, and improve the conversion efficiency.

Active Publication Date: 2012-07-04
武汉硕美特电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above documents and existing patents only involve the improvement of the contact resistance and printing performance of the front silver paste, but none of them proposes the technology for improving the performance of the high temperature sintering window of the paste. The high temperature sintering window of the existing front silver paste Narrow, generally only 20-40 ° C, often encounter low-efficiency cells due to fluctuations in high-temperature sintering temperature or unreasonable temperature range settings during production

Method used

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  • Silicon solar battery front silver paste with wide high-temperature sintering window
  • Silicon solar battery front silver paste with wide high-temperature sintering window

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of silicon solar cell front silver paste (preparation 100g) of wide high temperature sintering window, its production process is as follows:

[0028] Weigh 6g of silicon dioxide with an average particle size of 40nm, weigh 92g of glass powder with a particle size of 1-6μm and a softening point of 440°C, and weigh 0.5-3μm of Bi 2 o 3 2g of the mixed material was ball-milled for 3 hours and dried to obtain the inorganic mixed additive.

[0029] The organic resin is weighed at 1-10% of the raw material weight, the solvent is 5-15% of the raw material weight, and the organic modification additive is weighed at 1-5% of the raw material weight, and stirred and mixed to obtain an organic carrier.

[0030] Slurry preparation: weigh 8g of inorganic mixed additives, 82g of silver powder, and 10g of organic vehicle, stir and disperse evenly in a container, and then perform three-roll grinding to obtain a silver paste with a slurry fineness of less than 10 μm.

[0031] Use...

Embodiment 2

[0036] A kind of silicon solar cell front silver paste (preparation 100g) of wide high temperature sintering window, its production process is as follows:

[0037] Weigh 12g of silicon dioxide with an average particle size of 80nm, weigh 85g of glass frit with a particle size of 1-6μm and a softening point of 420°C, and weigh Bi with a particle size of 0.5-3μm. 2 o 33g of the mixed material was ball-milled for 3 hours and dried to obtain the inorganic mixed additive.

[0038] The organic resin is weighed at 1-10% of the raw material weight, the solvent is 5-15% of the raw material weight, and the organic modification additive is weighed at 1-5% of the raw material weight, and stirred and mixed to obtain an organic carrier.

[0039] Slurry preparation: Weigh 5g of inorganic mixed additives, 85g of silver powder, and 10g of organic vehicle, stir and disperse evenly in a container, and then perform three-roll grinding to obtain a silver paste with a slurry fineness of less than ...

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Abstract

The invention relates to a formula of a silicon solar battery front silver paste with a wide high-temperature sintering window and a preparation method for the front silver paste. The invention is mainly characterized in that: an inorganic mixed additive which is obtained by pre-treatment is added into a silver paste, so the high-temperature sintering window of the paste is remarkably widened, and the process performance of the front silver paste is greatly improved. The inorganic mixed additive consists of a glass material with specific softening points, nano silica of a specific size, and superfine bismuth trioxide (Bi2O3). When a battery piece is quickly sintered by using a tunnel furnace and subjected to heat treatment, the inorganic mixed additive can well corrode a silicon nitride anti-reflection film on the front of a battery, and good ohmic contact can be well formed between silver and silicon, so that compared with the temperature of the high-temperature sintering window of the conventional paste, the temperature of the high-temperature sintering window of the front silver paste can reach 80 DEG C and can rise by 20 to 40 DEG C. The preparation method for the front silver paste comprises the processes of preparation and pre-treatment of the inorganic mixed additive, preparation of the silver paste and processing of the paste.

Description

technical field [0001] The invention relates to a silver conductor paste for front grid wire electrodes of silicon solar cells, which is used for making front grid wire silver electrodes on crystalline silicon solar cells. Background technique [0002] In order to output electric energy from a solar cell, positive and negative electrodes must be made on the battery sheet. The electrode is a conductive material that forms a close ohmic contact with both ends of the p-n junction of the battery. It is customary to call the electrode made on the illuminated side of the battery as the upper electrode or the front electrode, and the electrode made on the back of the battery as the lower electrode or the back electrode. The lower electrode is the positive electrode, which is made of aluminum paste and back silver paste. The upper electrode is the negative electrode, which is made of positive silver paste. Both the positive electrode and the back electrode are made by printing paste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
Inventor 范琳
Owner 武汉硕美特电子材料有限公司
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