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A front silver paste suitable for high square resistance shallow junction solar cells

A solar cell, high square resistance technology, applied in conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as difficulty in accurately controlling the corrosion depth of silicon wafers and inability to meet requirements, and achieve The effect of improving photoelectric conversion efficiency, moderate corrosion ability, and reducing resistance

Active Publication Date: 2019-11-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used silver paste corrodes silicon wafers unevenly during the sintering process, and it is difficult to accurately control the etching depth of silicon wafers. It can meet the requirements for traditional solar cells, but cannot meet the requirements of new high-resistivity shallow-junction solar cells. Demand for Silver Paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A silver paste suitable for the front side of high-resistance high-efficiency solar cells, its composition and mass percentage are: mixed silver powder 83.5%, TeO 2 -Bi 2 o 3 It is 4% of lead-free glass powder, 0.5% of a small amount of phosphorus-containing compound, and 12% of organic vehicle.

[0017] The composition and mass percent of the mixed silver powder are: 80% of spherical silver powder with an average particle diameter of 1.87 μm, and 20% of nano silver powder with an average particle diameter of 60 nm;

[0018] The composition and mass percent of the lead-free glass powder are: TeO 2 40%, Bi 2 o 3 35%, SiO 2 7%, Al 2 o 3 5%, TiO 2 3%, ZnO 5%, MgO 3%, Li 2 O 1%, NaF 1%; glass powder softening temperature at 398°C, average particle size 2.57 µm;

[0019] The composition and mass percentage of the organic carrier are: 55% terpineol, 20% butyl carbitol, 7% dibutyl phthalate, 7% silane coupling agent (KH-5700), lecithin 0.5%, polyamide wax slurr...

Embodiment 2

[0022] A silver paste suitable for the front side of high-resistance high-efficiency solar cells, its composition and mass percentage are: mixed silver powder 85%, TeO 2 -Bi 2 o 3 It is 6% of lead-free glass powder, 1% of a small amount of phosphorus-containing compound, and 8% of organic carrier.

[0023] The composition and mass percent of the mixed silver powder are: 70% of spherical silver powder with an average particle diameter of 1.12 μm, and 30% of nano silver powder with an average particle diameter of 0.1 μm;

[0024] The composition and mass percent of the lead-free glass powder are: TeO 2 35%, Bi 2 o 3 30%, SiO 2 15%, Al 2 o 3 7%, TiO 2 5%, ZnO 3%, MgO 4%, Li 2 O 0.5%, NaF 0.5%;

[0025] The softening temperature of the glass powder is 421°C, and the average particle size is 1.97 µm; the composition and mass percentage of the organic vehicle are: 40% terpineol, 30% butyl carbitol, 25% dibutyl phthalate, silane Coupling agent (KH-5700) 3%, ethyl cellu...

Embodiment 3

[0028] A silver paste suitable for the front side of high-resistance high-efficiency solar cells, its composition and mass percentage are: mixed silver powder 80%, TeO 2 -Bi 2 o 3 It is 6.9% of lead-free glass powder, 0.1% of a small amount of phosphorus-containing compound, and 13% of organic vehicle.

[0029] The composition and mass percent of the mixed silver powder are: 90% of spherical silver powder with an average particle diameter of 2 µm, 10% of nano silver powder with an average particle diameter of 50nm;

[0030] The composition and mass percent of the lead-free glass powder are: TeO 2 30%, Bi 2 o 3 33%, SiO 2 5%, Al 2 o 3 1%, TiO 2 7%, ZnO 8%, MgO 8%, Li 2 O 4%, NaF 4%;

[0031] The softening temperature of the glass powder is 437°C, and the average particle size is 2.12 µm; the composition and mass percentage of the organic vehicle are: 65% terpineol, 10% butyl carbitol, 5% dibutyl phthalate, silane Coupling agent (KH-5700) 1%, lecithin 3%, polyamide...

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Abstract

The invention discloses front-side silver paste suitable for a high-square-resistance shallow-junction solar cell. The silver paste is composed of the following components, in mass percentage, 80-85% of mixed silver powders formed by spherical silver powders, the average grain diameter of which is 0.5-2 microns and nanometer silver powders, the average grain diameter of which is smaller than 0.1 microns, 4-7% of TeO2-Bi2O3 series lead-free glass powders, 8-13% of organic carriers and 0.1-1% of phosphorus-containing compounds. The front-side silver paste has excellent printing performance, wide sintering window (700-950 DEG C), low square resistance and suitable corrosion capability for a silicon matrix, can corrode and penetrate an anti-reflection layer without destroying a P-N junction, and is suitable for a silicon solar cell having a high-square-resistance shallow-junction structure.

Description

technical field [0001] The invention relates to an electronic paste, in particular to a front silver paste suitable for high square resistance shallow junction solar cells. Background technique [0002] In solar cells, it is one of the main development directions of crystalline silicon solar cells to improve the short-wave response of the cell and reduce the occurrence of dead junctions through the high square resistance and low diffusion shallow junction technology, so as to improve the photoelectric conversion efficiency of solar cells. However, the junction depth of the P-N junction of solar cells using the shallow junction process is very shallow (<0.3 µm). In order not to damage the P-N junction, it is required that the etching of the surface of the silicon wafer by the front silver paste not exceed 0.1 µm during the sintering process. Commonly used silver paste corrodes silicon wafers unevenly during the sintering process, and it is difficult to accurately control t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425
Inventor 甘国友余向磊滕媛严继康杜景红易健宏
Owner KUNMING UNIV OF SCI & TECH
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