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PERC battery piece back electrode silver paste suitable for high-temperature sintering and preparation method of PERC battery piece back electrode silver paste

A high-temperature sintering, back electrode technology, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. damage, etc.

Pending Publication Date: 2022-04-15
GUANGDONG NANHAI ETETB TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The glass frit in the silver paste of the back electrode of the PERC solar cell acts as an inorganic binder, and at the same time has a corrosion effect on the silicon nitride film of the back electrode. During high-temperature sintering, the silicon nitride in the back electrode area is destroyed, and the photoelectric conversion efficiency of the cell is reduced
[0003] Ordinary back electrode silver paste adopts single-component glass powder, such as Chinese patent CN202110261423 through Li 2 O, Na 2 O, MgO, CaO, WO 3 , ZnO, Al 2 o 3 , Bi 2 o 3 , PbO, TeO 2 , B 2 o 3 , SiO 2 , GeO 2 Obtain a glass frit with silver paste on the back, however, a single-component glass frit cannot adapt to a wide sintering temperature window and good pull-off force at the same time, and there are certain limitations in use

Method used

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  • PERC battery piece back electrode silver paste suitable for high-temperature sintering and preparation method of PERC battery piece back electrode silver paste
  • PERC battery piece back electrode silver paste suitable for high-temperature sintering and preparation method of PERC battery piece back electrode silver paste
  • PERC battery piece back electrode silver paste suitable for high-temperature sintering and preparation method of PERC battery piece back electrode silver paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A silver paste suitable for high-temperature sintering PERC cell back electrode, the composition is as follows by weight percentage:

[0039] Spherical silver powder 65.4%, glass powder A 1.1%, glass powder B 0.5%, organic vehicle 33.0%.

[0040] Among them, the spherical silver powder has a particle size D10 of 0.5-1.5 μm, a D50 of 1.0-2.0 μm, a D90 of 2.0-3.0 μm, and a tap density of 3.5-5.5 g / cm by a laser particle size distribution analyzer. 3 ; Specific surface area 1.0-2.0m 2 / g.

[0041] The softening point of glass powder A is 650-750°C, and the composition is as follows in parts by weight: Bi 55%; Si 10%; Ti 5%; B 3%; Mg 10%; Ag 2%; Ca 15%; glass powder B The softening point is 450-600°C, and the composition is as follows in parts by weight: Pb 45%, Bi 15%, Si 15%, Ti 5%, Cu 6%, Mn 14%.

[0042]The preparation method of glass powder A is as follows: mix the components of glass powder A evenly, bake at 1400°C until the glass liquid is clear and transparent, t...

Embodiment 2

[0048] A silver paste suitable for high-temperature sintering of the back electrode of the PERC cell, which is the same as in Example 1, except that the glass powder A is 0.9%, and the glass powder B is 0.7%.

[0049] The preparation method of the back electrode silver paste is the same as in Example 1.

Embodiment 3

[0051] A silver paste suitable for high-temperature sintering of the back electrode of PERC cells, which is the same as that in Example 1, except that the glass powder A is 0.7%, and the glass powder B is 0.9%.

[0052] The preparation method of the back electrode silver paste is the same as in Example 1.

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Abstract

The invention relates to H01B1, in particular to PERC battery piece back electrode silver paste suitable for high-temperature sintering and a preparation method of the PERC battery piece back electrode silver paste. The back electrode silver paste at least comprises silver powder, glass powder A with the softening point of 650-750 DEG C, glass powder B with the softening point of 450-600 DEG C and an organic carrier. The glass powder A and the glass powder B with different softening temperatures are used, the proportion of the glass powder A and the glass powder B is controlled at the same time, the high-temperature sintering process can be met, the highest peak value sintering temperature can reach 800-820 DEG C, the electrode area detected by a photoluminescence tester for the sintered battery piece is bright and white, the back film of the battery piece is not damaged, and the service life of the battery piece is prolonged. And the similar slurry in the market has obvious blackening phenomenon, and has obvious advantages compared with the similar slurry in the market.

Description

technical field [0001] The present invention relates to H01B1, and more specifically, the present invention relates to a silver paste suitable for high-temperature sintering PERC cell back electrode and a preparation method thereof. Background technique [0002] The glass frit in the silver paste of the back electrode of the PERC solar cell acts as an inorganic binder, and at the same time has a corrosion effect on the silicon nitride film of the back electrode. During high-temperature sintering, the silicon nitride in the back electrode area is destroyed, and the photoelectric conversion efficiency of the cell is reduced. [0003] Ordinary back electrode silver paste adopts single-component glass powder, such as Chinese patent CN202110261423 through Li 2 O, Na 2 O, MgO, CaO, WO 3 , ZnO, Al 2 o 3 , Bi 2 o 3 , PbO, TeO 2 , B 2 o 3 , SiO 2 , GeO 2 A glass frit with silver paste on the back is obtained. However, the single-component glass frit cannot adapt to a wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
CPCH01B1/22H01B13/0036
Inventor 贺克成曾文伍子成杨至灏黄良辉
Owner GUANGDONG NANHAI ETETB TECH CO LTD
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