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Efficient crystalline silicon solar battery front side silver paste and preparation method thereof

A solar cell and crystalline silicon technology, applied in the field of solar cells, can solve the problems of complex manufacturing process and high cost, and achieve the effects of wide process window, high short-circuit current, and high conversion efficiency

Inactive Publication Date: 2012-12-19
浙江金诺新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when preparing SE structure batteries, the manufacturing process is more complicated and the cost is higher.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a front silver paste of a high-efficiency crystalline silicon solar cell, the specific method is:

[0019] 1. Weigh five kinds of oxides, and its specific weight percentage is 60%Bi 2 o 3 , 5%B 2 o 3 , 20% SiO2 2 , 10%Al 2 o 3 , 5%ZnO.

[0020] 2. Mix the above weighed oxides thoroughly and evenly, place them in a corundum crucible, cover the crucible lid, preheat at 200°C for half an hour, melt at 1300°C for 1 hour, pour in pure water at room temperature, and solidify into shattered glass.

[0021] 3. The above cullet is then ball milled, sieved and dried to form a 10-15 μm glass powder. Add 3% by weight of the above-mentioned glass powder to the silver powder to prepare the front silver paste of high-efficiency crystalline silicon solar cells.

[0022] Through experiments, the silver paste prepared in Example 1 has an average photoelectric conversion efficiency of 18.2% on a monocrystalline silicon cell with a side length of 12.5 cm,...

Embodiment 2

[0025] A method for preparing a front silver paste of a high-efficiency crystalline silicon solar cell, the specific method is:

[0026] 1. Weigh five kinds of oxides, and its specific weight percentage is 65% Bi 2 o 3 , 5%B 2 o 3 , 10% SiO 2 , 10%Al 2 o 3 , 10%ZnO.

[0027] 2. Mix the above-mentioned weighed oxides thoroughly and evenly, place them in a corundum crucible, cover the crucible lid, preheat at 200°C for half an hour, melt at 1200°C for 1 hour, pour in pure water at room temperature, and solidify into shattered glass.

[0028] 3. The above cullet is ball milled, sieved and dried to form a 5-10 μm glass powder. Add 4% by weight of the above-mentioned glass powder to the silver powder to prepare the front silver paste of high-efficiency crystalline silicon solar cells.

[0029] Through experiments, the silver paste prepared in Example 2 has an average photoelectric conversion efficiency of 18.3% on a monocrystalline silicon cell with a side length of 12.5...

Embodiment 3

[0032] A method for preparing a front silver paste of a high-efficiency crystalline silicon solar cell, the specific method is:

[0033] 1. Weigh five kinds of oxides, the specific weight percentage is 40% Bi 2 o 3 , 10%B 2 o 3 , 30% SiO 2 , 10%Al 2 o 3 , 10%ZnO.

[0034] 2. Mix the above weighed oxides thoroughly and evenly, place them in a corundum crucible, cover the crucible lid, preheat at 200°C for half an hour, melt at 1300°C for 1 hour, and then pour pure water at room temperature. Solidifies into shattered glass.

[0035] 3. The above glass is ball milled, sieved, and dried to form a 1-5 μm glass powder. Add 5% by weight of the above glass powder to the silver powder to prepare the front silver paste of the crystalline silicon solar cell.

[0036] Through experiments, the silver paste prepared in Example 3 has an average photoelectric conversion efficiency of 18.25% on a monocrystalline silicon cell with a side length of 12.5 cm, a short-circuit current of 5....

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Abstract

The invention provides an efficient crystalline silicon solar battery front side silver paste which is prepared by adding glass powder into the silver paste, wherein the glass powder is prepared from the following ingredients in weight percentage: 0-90% of Bi203, 0-30% of B203, 0-50% of SiO2, 0-20% of Al203 and 0-20% of ZnO. The efficient crystalline silicon solar battery front side silver paste provided by the invention has a wider process window, has excellent ohmic contact and at the same time has a high short-circuit current, so that the conversion efficiency is high, the stability is good and the cost performance is high.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a high-efficiency crystalline silicon solar cell front silver paste and a preparation method thereof. Background technique [0002] At present, the manufacturing process of ordinary crystalline silicon solar cells consists of seven steps, 1. Removing the damaged layer on the surface of the silicon wafer; 2. Forming a textured structure; 3. Diffusion to form a PN junction; 4. Removing phosphosilicate glass; 5. Depositing an anti-reflection film; 6. Screen printing front and back electrodes; 7. Sintering to form ohmic contact. The conversion efficiency of crystalline silicon cells manufactured by this process is limited by its structure and physical mechanism, and its single crystal conversion efficiency is difficult to exceed 18.0%. For P-type silicon wafers, when making PN junctions, low-concentration surface doping can reduce the recombination probability of minority carrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01L31/0224C03C12/00
Inventor 金建江郭明星
Owner 浙江金诺新能源科技有限公司
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