Modified silver thick film sizing agent for crystalline silicon solar cell and preparation method thereof

A technology of solar cells and crystalline silicon, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. and other problems, to achieve the effect of improving the agglomeration state, improving the mechanical strength, and improving the light conversion efficiency.

Active Publication Date: 2012-07-04
上海太阳能工程技术研究中心有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, since these methods directly mix the solid phase used in the slurry with the high-viscosity organic phase, the solid powder has been agglomerated very seriously before grinding and ball milling
At the same time, the mechanical dispersion force produced by three-roll grinding and ball milling is limited, and the processing object is slurry with high solid content and high viscosity, which can only disperse larger aggregates, thus affecting the slurry scraper. Further reduction in fineness

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  • Modified silver thick film sizing agent for crystalline silicon solar cell and preparation method thereof
  • Modified silver thick film sizing agent for crystalline silicon solar cell and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a preparation method of the above-mentioned silver thick film paste for crystalline silicon solar cells, comprising the following steps:

[0035] (1) The conductive ultrafine silver powder, glass powder and surfactant are carried out ball milling pretreatment, ball milling speed is 40-100r / min, is preferably 60-80r / min; Ball milling time is 0.5-3h, is preferably 1.5- 2.5h; then filter and dry to obtain the ball milling pretreatment product;

[0036] (2) Mixing and rolling the ball-milling pretreatment product with the organic phase to obtain silver thick-film paste for modified crystalline silicon solar cells.

[0037] In the above technical solution, the ball milling medium used in the ball milling pretreatment is agate ball milling beads.

[0038] In the above technical scheme, during the ball milling pretreatment, a ball milling aid is also added, and the addition amount of the ball milling aid is 10-30% of the total weight of the...

Embodiment 1～6

[0041] Add conductive ultra-fine silver powder (average particle size: 2.5 μm), glass powder, PVP (brand PVP40), gelatin (analytical grade), isopropanol and agate ball milling beads into a ball milling tank for ball milling, take out the materials, and dry them under vacuum at 40°C Back with organic phase (organic phase is terpineol in embodiment 1-4: ethyl cellulose=10: 1wt / wt; Organic phase is butyl carbitol in embodiment 5: ethyl cellulose=20: 1wt / wt; the organic phase in embodiment 6 is citric acid ester: methyl cellulose=5: 1wt / wt) premixes in mixer, mixes and rolls on three-roll machine then, obtains silver thick-film slurry, uses scraper The scraper fineness of the slurry was tested with a plate fineness meter, and the viscosity was measured with a viscometer (Brookfield HBT / 10 rpm, 25° C.). Use this slurry to make the front electrode of the solar cell by screen printing, prepare the solar cell according to the conventional method, and measure its fill factor FF, serie...

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Abstract

The invention discloses a modified silver thick film sizing agent for a crystalline silicon solar cell and a preparation method thereof. The modified silver thick film sizing agent comprises the following ingredients by weight percentage: conductive superfine silver powders accounting for 75 to 90 percent, glass powders accounting for 1 to 8 percent, and organic phases accounting for 9 to 17 percent; in addition, the modified silver thick film sizing agent also comprises surface active agents accounting for 0.05 to 2 percent of the total weight of the conductive superfine silver powders and the glass powders. According to the invention, the surfaces of the powders are coated with a layer of surface active agents, so that the aggregation condition of the powders can be improved, the powders can be dispersed in the organic phases better so as to form a more stable sizing agent system, at the same time, the scraper fineness of the sizing agent can be reduced, and the service life of the sizing agent can be prolonged. An electrode printed through the modified silver thick film sizing agent achieves great height, low body resistance and higher mechanical strength after being sintered. Therefore, not only the modified silver thick film sizing agent disclosed by the invention improves the mechanical strength of the electrode of the cell, but also fill factors (FF) of the cell are increased, the series resistance is reduced, the optical conversion efficiency is improved, and the cell can be enabled to achieve good balance of comprehensive electrical property and mechanical performance.

Description

technical field [0001] The invention relates to silver thick-film paste for crystalline silicon solar cells and a preparation method thereof. Background technique [0002] In the manufacturing process of crystalline silicon solar cells, it is necessary to make electrodes on the front and back surfaces of the cells to lead out the photo-generated current generated by the cells. A good ohmic contact needs to be formed between the electrode and the semiconductor. The methods for making electrodes include vacuum evaporation method, magnetron sputtering method, light-induced electroplating method and screen printing method. The cost of the screen printing method is low, which is beneficial to realize the industrialization and large-scale production of solar cells, and the screen printing method is generally used in the process. [0003] The screen printing method is used to prepare the electrodes of crystalline silicon solar cells. The screen printing technology is used to coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01B13/00H01L31/0224
Inventor 敖毅伟杨云霞郑建华陈慧
Owner 上海太阳能工程技术研究中心有限公司
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