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Electrode silver slurry for crystalline silicon solar cell

A technology of solar cells and crystalline silicon, applied to conductive materials dispersed in non-conductive inorganic materials, circuits, photovoltaic power generation, etc., can solve problems such as reducing the melting temperature of aluminum powder, increasing the cost of silver paste, and reducing battery conversion efficiency. Achieve the effects of improving conductivity, saving precious metal silver, and good economic benefits

Inactive Publication Date: 2016-06-08
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 silver paste can increase the thickness of the alloy layer and improve the ohmic contact, but in this silver paste, 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 silver paste, which greatly increases the cost of the silver paste

Method used

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  • Electrode silver slurry for crystalline 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, 5~15μm...

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 a photocell electrode material, and discloses electrode silver slurry for a crystalline silicon solar cell. The electrode silver slurry is prepared from, by weight, 40-60 parts of silver powder, 5-10 parts of antimony powder, 10-20 parts of manganese copper alloy powder, 1-5 parts of lithium iron phosphate and carbon nanotube composite materials, 1-8 parts of glass powder, 0.5-2 parts of silane coupling agent, 8-10 parts of propylene glycol mono-n-butyl ether, 1-5 parts of turpentine oil, 1-3 parts of lecithin, 0.1-0.5 part of ethyl cellulose and 0.25-1 part of fumed silica. The invention further discloses a preparation method of the electrode silver slurry. The obtained electrode silver slurry is free of lead and completely meets the environment protection requirement; when the electrode silver slurry is applied to production of the solar cell, the adhesion of the electrode silver slurry on the surface of the solar cell is high, and the photoelectric conversion efficiency of the solar cell is high; meanwhile, the technology is simple, the cost is low, and therefore the electrode silver slurry has a wide application prospect.

Description

technical field [0001] The invention relates to a photovoltaic cell electrode material, in particular to an electrode silver paste for a crystalline silicon solar cell. 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 o...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 孟沪生李正良陆竣行谢刚邱秋燕邓颖成蒙纪全
Owner GUANGXI JIKUAN SOLAR ENERGY EQUIP
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