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Slurry for silicon solar cell

A silicon solar cell and paste technology, applied in circuits, conductive materials dispersed in non-conductive inorganic materials, electrical components, etc., can solve the problems of reducing the conversion efficiency of cells, reducing the melting temperature of aluminum powder, increasing costs, etc. Good economic benefits, improved electrical conductivity, improved contact effect

Inactive Publication Date: 2016-07-27
GUANGXI JIKUAN SOLAR ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this slurry can increase the thickness of the alloy layer and improve the ohmic contact. However, in this slurry, the silicon alloy powder and the functional conductive powder (i.e. aluminum powder) are only simply mechanically mixed, and the sintering will not reduce the aluminum powder. The melting temperature may also introduce impurity elements into the back field, reducing the conversion efficiency of the battery
In addition, the rare metal indium powder is used in the slurry, which greatly increases the cost of the slurry

Method used

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  • Slurry for silicon solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First prepare the lithium iron phosphate / carbon nanotube composite material:

[0028] (1) Ultrasonic disperse 8g of carbon nanotubes in a mixed solvent of 450g of ethanol and water with a volume ratio of 1:1 to form a carbon nanotube dispersion;

[0029] (2) Then add 20g of lithium carbonate, 10g of iron nitrate, 8g of lithium dihydrogen phosphate and 15g of sucrose to the carbon nanotube dispersion, heat and stir to form a slurry, cool to room temperature and ultrasonically disperse for 15min, then place in a vacuum drying oven for 15h , and then vacuumize and heat to 60°C until the solvent in the slurry evaporates completely;

[0030] (3) Pre-calcining the composite material treated in step (2) in a muffle furnace at 350° C. for 6 hours, and then firing at 750° C. for 6 hours to obtain the lithium iron phosphate / carbon nanotube composite material.

[0031] Then prepare glass powder and organic carrier, wherein the composition of glass powder I is 5~15 μm SiO 2 20g, ...

Embodiment 2

[0034] First prepare the lithium iron phosphate / carbon nanotube composite material:

[0035] (1) Ultrasonic disperse 5g of carbon nanotubes in a mixed solvent of 400g of ethanol and water with a volume ratio of 1:1 to form a carbon nanotube dispersion;

[0036] (2) Add 25g of lithium carbonate, 5g of iron nitrate, 5g of lithium dihydrogen phosphate and 10g of sucrose to the carbon nanotube dispersion, heat and stir to form a slurry, cool to room temperature and ultrasonically disperse for 10min, then place in a vacuum drying oven for 20h , and then vacuumize and heat to 50°C until the solvent in the slurry evaporates completely;

[0037] (3) Pre-calcining the composite material treated in step (2) in a muffle furnace at 300° C. for 7 hours, and then firing at 700° C. for 5 hours to obtain the lithium iron phosphate / carbon nanotube composite material.

[0038] Then prepare glass powder and organic carrier, wherein the composition of glass powder I is 5~15 μm SiO 2 15g, 5~15μmBi...

Embodiment 3

[0041] First prepare the lithium iron phosphate / carbon nanotube composite material:

[0042] (1) Ultrasonic disperse 10g of carbon nanotubes in a mixed solvent of 500g of ethanol and water with a volume ratio of 1:1 to form a carbon nanotube dispersion;

[0043] (2) Then add 20g of lithium carbonate, 10g of iron nitrate, 10g of lithium dihydrogen phosphate and 15g of sucrose to the carbon nanotube dispersion, heat and stir to form a slurry, cool to room temperature and ultrasonically disperse for 10min, then place in a vacuum drying oven for 20h , and then vacuumize and heat to 50°C until the solvent in the slurry evaporates completely;

[0044] (3) Pre-calcining the composite material treated in step (2) in a muffle furnace at 300° C. for 7 hours, and then firing at 700° C. for 5 hours to obtain the lithium iron phosphate / carbon nanotube composite material.

[0045] Then prepare glass powder and organic carrier, wherein the composition of glass powder I is 5~15 μm SiO 2 30g...

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Abstract

The invention belongs to photoelectric cell electrode materials, and discloses a slurry for silicon solar cells. In terms of parts by weight, the slurry raw materials are composed of: 40-60 parts of silver powder, 5-10 parts of copper powder, 10-20 parts of silver-coated aluminum alloy powder, and 1-5 parts of lithium iron phosphate / carbon nanotube composite material , 1-8 parts of glass powder, 0.5-2 parts of silane coupling agent, 8-10 parts of propylene glycol monobutyl ether, 1-5 parts of turpentine, 1-3 parts of lecithin, 0.1-0.5 parts of carbomer, gas phase dioxide Silicon 0.25‑1 part. The invention also discloses a preparation method of the slurry. The slurry obtained in the present invention does not contain lead, fully meets the requirements of environmental protection, is applied to the production of solar cells, can form strong adhesion on the surface of solar cells, and has high photoelectric conversion efficiency of the cells. At the same time, the process of the present invention is simple and the cost is low, so it has broad application potential. application prospects.

Description

technical field [0001] The invention relates to photoelectric cell electrode materials, in particular to a slurry for silicon solar cells. Background technique [0002] Solar cells can directly convert light energy into electrical energy, which is a way to effectively utilize solar energy and is also an important renewable and clean energy source. In the past ten years, in the rapidly developing photovoltaic industry, high efficiency and low cost have been the two main points of competition. As the most important solar cell material, crystalline silicon has occupied most of the photovoltaic market due to its high efficiency and stability. share. [0003] Crystalline silicon solar cells are devices that directly convert light energy into electrical energy through the photoelectric effect or photochemical effect. When sunlight irradiates on the crystalline silicon semiconductor p-n junction, new hole-electron pairs are formed. Under the action of the p-n junction electric fi...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/18H01B1/22H01B1/24H01B13/00H01L31/0224
CPCH01B1/16H01B1/18H01B1/22H01B1/24H01B13/00H01L31/022425
Inventor 陈名贤李光明蒙献芳邱秋燕邓颖成蒙纪全
Owner GUANGXI JIKUAN SOLAR ENERGY EQUIP
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