A kind of front silver paste for crystalline silicon solar cell

A solar cell and crystalline silicon technology, applied in the field of solar cells, can solve the problems of easy burn-through, increased resistance, and reduced printing performance, and achieves good printability, improved open circuit voltage, and good printing performance.

Inactive Publication Date: 2016-05-11
NINGBO GUANGBO NEW NANOMATERIALS STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the increased square resistance of the cell, the pn junction is relatively shallow, and it is easy to burn through during the sintering process, reducing Isc and Uoc, and increasing the defective rate; moreover, the resistance encountered by electrons transferred to the busbar will also increase. Therefore, the distance between fine grid lines is required to be short, and the shorter the spacing means that the number of lines will increase. At the same time, in order not to increase the shading area, the width of the lines needs to be narrowed, which will lead to a decrease in printing performance.

Method used

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  • A kind of front silver paste for crystalline silicon solar cell
  • A kind of front silver paste for crystalline silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Metal conductive powder

[0019] Silver powder by physical method is 65%, average particle size D50 is 1.5μm, silver powder prepared by chemical method accounts for 35%, average particle size D50 is 0.8μm.

[0020] 2. Preparation of modified organic binder

[0021] Weigh 60% terpineol, 15% butyl carbitol, 12% butyl carbitol acetate, 2.5% hydrogenated castor oil, 7.5% ethyl cellulose, 1.0% coupling agent (such as KH550), 1.0% lecithin and 1.0% thixotropic agent (polyamide wax), mix evenly, and dissolve at a temperature of 120-130°C while stirring, and the time is 110-120min to obtain a transparent modified Non-toxic organic adhesives.

[0022] 3. Preparation of back silver paste

[0023] By mass percentage 86% silver powder 10.8% modified organic binder, 3.2% silicate glass powder (silicate glass powder, its mass percentage composition is SiO 2 4.3%, Al 2 o 3 0.4%, B 2 o 3 2.0%, Zn 3 (PO 4 ) 2 8.3%, BaCO 3 0.2%, MgO0.4%, TeO 2 20%, P 2 o 5 0.2%, Pb 3 o...

Embodiment 2

[0029] 1. Metal conductive powder

[0030] The silver powder prepared by physical method is 70%, and the average particle size D50 is 2.0μm, and the silver powder prepared by chemical method accounts for 30%, and the average particle size D50 is 0.8μm.

[0031] 2. Preparation of modified organic binder

[0032] Weigh 60% terpineol, 15% butyl carbitol, 12% butyl carbitol acetate, 2.5% hydrogenated castor oil, 7.5% ethyl cellulose, 1.0% coupling agent , 1.0% lecithin and 1.0% thixotropic agent; mix evenly, dissolve at a temperature of 80-100°C while stirring while heating, and the time is 60-80min to obtain a transparent modified organic adhesive.

[0033] 3. Preparation of back silver paste

[0034] According to the mass percentage of 87% silver powder, 9.8% modified organic binder, 3.2% silicate glass powder, after mixing evenly, use a three-roller grinder for 5 times to obtain a fineness ≤ 12μm, viscosity 305kcps Front silver paste.

[0035] The above slurry was screen-pr...

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PUM

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Abstract

The invention discloses front silver paste for crystalline silicon solar cells. The front silver paste is characterized by comprising, by mass, 85%-90% of silver powder, 5%-12% of modified organic binder and 1%-3.5% of inorganic binder, wherein the sum of the mass percents of all the components is 100%. The front silver paste prepared from the silver powder prepared through both a physical method and a chemical method, the modified organic binder and glass power has the advantages that the printing performance is excellent, and the aspect ratio of a thin grid line is large; meanwhile, the requirement for sintering temperature is low, a pn junction is not prone to being burnt through, and therefore Isc and Uoc are effectively improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a front silver paste for crystalline silicon solar cells. Background technique [0002] With the continuous development of the photovoltaic industry, the structure of crystalline silicon solar cells is also constantly updated and changed, and the efficiency of the cells is also constantly improving. From the previous single crystal conversion efficiency of 15.0% to the current 19.0%, with the improvement of technology And the improvement of equipment technology, the efficiency will continue to increase. [0003] The increase in the efficiency of crystalline silicon cells on the market is largely due to the increase in the square resistance of the cell, which has increased from the previous silicon chip square resistance of 45Ω / □ to the current 80-90Ω / □. Improving the square resistance of the cell mainly has several meanings: 1) The lower surface impurity concentration effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 宋财根董政王利平江益龙
Owner NINGBO GUANGBO NEW NANOMATERIALS STOCK
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