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Conductive paste for PERC solar cell, preparation method and application thereof

A technology of solar cells and conductive paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. The effect of strong de-corrosion and reduction of dispersion difficulty

Inactive Publication Date: 2017-02-22
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no practical solution has emerged. Therefore, if an aluminum paste containing both doping elements and a certain proportion of silicon can be developed, the doping concentration of the back field can be solved simultaneously during the sintering process. The defects of low and back holes have great practical value for improving the efficiency of PERC cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a preparation method and application of a conductive paste for PERC solar cells, and the specific steps are as follows:

[0038] 1) Preparation of boron-doped silicon nanoparticles. Select doping 5.65×10 19 atoms / cm 3 The P-type boron-doped silicon ingot is used as the raw material, and the silicon microspheres are prepared by the pulse discharge method. The process parameters of the pulse discharge are: open circuit voltage 120V; peak current 5A; pulse width 20μs; duty ratio 1:5. The obtained silicon particles have a diameter ranging from 1 to 500 nm. Soak in 15% dilute nitric acid for 0.5 hour, wash with deionized water for 5 times, and centrifuge and classify to obtain silicon nanoparticles. Vacuum drying at 110°C for 2 hours to remove excess water and obtain doped silicon nanopowder. Scanning electron microscope (SEM) and laser particle size analyzer test results show that the particle size of silicon nanoparticles is 10-50nm, and the siz...

Embodiment 2

[0046] This embodiment provides a preparation method and application of a conductive paste for PERC solar cells, and the specific steps are as follows:

[0047] 1) Preparation of phosphorus-doped silicon nanoparticles. Select doping 1.06×10 20 atoms / cm 3 The N-type phosphorus-doped silicon ingot is used as the raw material, and the silicon microspheres are prepared by the pulse discharge method. The process parameters of the pulse discharge are: open circuit voltage 120V; peak current 10A; pulse width 50μs; duty ratio 1:2. The obtained silicon particle diameter ranges from 10 to 500 nm. Soak in 10% dilute nitric acid for 1 hour, wash with deionized water for 5 times, and centrifuge to obtain silicon nanoparticles. Vacuum drying at 100°C for 3 hours to remove excess water and obtain doped silicon nanopowder. Scanning electron microscope (SEM) and laser particle size analyzer test results show that the particle size of silicon nanoparticles is 30-80nm, and the size concentrat...

Embodiment 3

[0055] The difference from Example 2 lies in the proportion of the organic vehicle, which in this example is: 60% organic solvent, 5% thickener, and 35% plasticizer.

[0056] The slurry was used in the same manner as in Example 2.

[0057] Battery test results: battery test efficiency photoelectric conversion efficiency 22.1%, open circuit voltage 0.675V, short circuit current 9.69A, fill factor 80.6%, back field recombination rate 50cm / s, maximum phosphorus doping concentration in the back partial opening area 3.4×10 19 atoms / cm 3 .

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Abstract

The invention provides a preparation method of a conductive paste for a PERC solar cell and application thereof. An aluminum-silicon mixed conductive paste containing doping elements according to the present invention comprises 60 to 85 percent of aluminum powder, 5 to 25 percent of doped silicon nanoparticles, 0.1 to 5 percent of inorganic binder and 15 to 35% of organic carriers, wherein the organic carriers are mainly composed of an organic solvent, a thickening agent and a plasticizer. Compared with existing aluminum conductive paste products, the conductive paste for the PERC solar cell of the invention is printed on the back of the a battery sheet, and in a cell sintering process, on one hand, back holes can be reduced to promote the formation of a silicon aluminum alloy layer and reduce contact resistance; on the other hand, the back field doping concentration and the junction depth can be increased, and the composite rate on the back surface can be reduced in order to improve the PERC cell photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method and application of a conductive paste for PERC solar cells. Background technique [0002] Electronic paste is the key material for manufacturing functional electrodes or thick film circuits of electronic components. It disperses various functional powders into a slurry through an organic carrier, and then prints on a semiconductor substrate or other substrates to form conductors, resistors, insulators or capacitors. Therefore, electronic paste is the basic material of electronic components, and also the key material for manufacturing precision thick film hybrid integrated circuits and other chip components. The development of electronic paste is an important link in the development of the microelectronic thick film material industry, and it is also a requirement for the manufacture of high-performance crystalline silicon solar cells. A conductive past...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/24H01B13/00H01L31/0224
CPCH01B1/22H01B1/24H01B13/00H01L31/022441Y02E10/50
Inventor 洪捐岳鹿耿其东杜建周陈松
Owner YANCHENG INST OF TECH
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