Crystalline silicon solar TOPCON battery piece front electrode main grid silver paste and preparation method thereof

A front electrode and solar energy technology, applied in the field of H01B1, can solve the problems of reduced photoelectric efficiency, agglomeration, and reduced contact probability of silver particles, and achieve the effect of improving sintering activity and reducing damage

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

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Problems solved by technology

However, if the D50 particle size is too large, the probability of contact between the silver particles will be reduced, and the space between the silver particles may be replaced by other components, resulting in a decrease in photoelectric efficiency and a decrease in the pulling force value, while the D50 particle size is small. Prone to agglomeration problems during sintering, resulting in poor dispersion problems

Method used

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  • Crystalline silicon solar TOPCON battery piece front electrode main grid silver paste and preparation method thereof
  • Crystalline silicon solar TOPCON battery piece front electrode main grid silver paste and preparation method thereof
  • Crystalline silicon solar TOPCON battery piece front electrode main grid silver paste and preparation method thereof

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Embodiment 1-5

[0031] A crystalline silicon solar energy TOPCON cell front electrode busbar silver paste, the composition is shown in Table 1 in parts by weight.

[0032] Table 1

[0033]

[0034] Wherein, by weight percent, glass powder 1 is 45% Pb, 15% Si, 5% Ti, 15% Bi, 3% B, 3% Mg, 6% W, 5% Ca, 3% Zn, particle size 0.5-2.5μm.

[0035] Glass powder 2 Commercially available conventional glass powder containing manganese and copper.

[0036] Spherical silver powder 1: The particle size distribution D50 is 0.6 μm, D10 is 0.3 μm, D90 is 1.5 μm, and the tap density is 6.5 g / cm measured by laser particle size distribution analyzer 3 .

[0037]Spherical silver powder 2: The particle size distribution D50 is 1.5 μm, D10 is 0.9 μm, D90 is 2.5 μm, and the tap density is 6.5 g / cm measured by laser particle size distribution analyzer 3 .

[0038] Spherical silver powder 3: The particle size distribution D50 is 0.4μm, D10 is 0.19μm, D90 is 0.87μm, and the tap density is 4g / cm measured by laser...

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Abstract

The invention relates to H01B1, in particular to crystalline silicon solar TOPCON battery piece front electrode main grid silver paste and a preparation method thereof. The main grid silver paste at least comprises the following components in percentage by weight: 82-88% of spherical silver powder, 1-2% of glass powder and 10-17% of organic adhesive. The sintering activity is greatly improved by regulating and controlling the particle size distribution, tap density and heavy sintering loss at 538 DEG C of the spherical silver powder, meanwhile, the situation that Mn and Cu elements need to be added into traditional glass powder is abandoned, the sintering activity of the glass powder is reduced, damage of slurry to a front film layer of a TOPCON battery piece is reduced, the wide sintering temperature of 740-820 DEG C is achieved, and in addition, the application range of the TOPCON battery piece is widened. The glass powder can have a good synergistic effect with the spherical silver powder, so that the pull-out force of the sintered electrode is higher than 2N, and the electrode part is bright white through detection of a photoluminescence tester.

Description

technical field [0001] The present invention relates to H01B1, and more specifically, the present invention relates to a busbar silver paste for front electrodes of crystalline silicon solar TOPCON cells and a preparation method thereof. Background technique [0002] TOPCon solar cell is a tunnel oxide passivated contact (TunnelOxide Passivated Contact) solar cell technology based on the principle of selective carriers. Its cell structure is an N-type silicon substrate cell, and ultra-thin silicon oxide is sequentially prepared on the back of the cell. layer and doped silicon thin layer, so that the passivation contact structure is formed, which effectively reduces surface recombination and metal contact recombination, and improves the conversion efficiency of N-PERT cells. [0003] The metallization process on the front of TOPCON batteries is different from that of traditional P-type PERC batteries. It puts forward higher requirements for the performance of the front silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
CPCH01B1/22H01B13/0036Y02E10/50
Inventor 贺克成曾文卢俊麒杨至灏黄良辉
Owner GUANGDONG NANHAI ETETB TECH CO LTD
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