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Paste for forming solar battery electrode

A technology of solar cells and pastes, applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problems of reduced open circuit voltage conversion efficiency, reduced electrode thickness, increased contact resistance, etc., to achieve Excellent electrical conductivity, low contact resistance, and high electrical performance

Inactive Publication Date: 2011-05-18
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the electrode is reduced, the formation of the back surface field effect (BSF) will be affected, especially when there is an uneven suede structure on the surface of the substrate, the conductivity will decrease, and the contact resistance between the aluminum electrode and the substrate will increase. Resulting in a reduction in open circuit voltage and conversion efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Aluminum powder A for solar cell electrode forming paste

[0029] 1% by mass of spherical aluminum powder with an average particle size of 0.91 μm and 95% of spherical aluminum powder with an average particle size of 6.12 μm are uniformly mixed to manufacture aluminum powder A for forming slurry for solar cell electrodes. The purity of the aluminum powder is more than 99.97% .

[0030] 2) Organic carrier B

[0031] Mix according to the mass percentage of ethyl cellulose 2.5%, resin 2%, terpineol 60%, diethylene glycol methyl ether 20%, butyl carbitol acetate 14.5%, lecithin 1%, and heat to 70-90 degree, so that the cellulose and resin are completely dissolved to form a transparent organic carrier B.

[0032] 3) Glass powder C

[0033] B 2 O 3 -SiO 2 -PbO series glass powder, average fineness 3.9μm, softening point 500℃.

[0034] According to the mass percentage, take aluminum powder A 72.5% for solar cell electrode forming paste, organic carrier B 25%, glass p...

Embodiment 2

[0036] 1) Aluminum powder D for solar cell electrode forming paste

[0037] Mix 8% by mass of spherical aluminum powder with an average particle size of 1.63 μm, 46% of spherical aluminum powder with an average particle size of 4.18 μm, and 46% of spherical aluminum powder with an average particle size of 6.12 μm to produce solar cell electrodes Forming aluminum powder D for slurry, the purity of aluminum powder is more than 99.97%.

[0038] 2) Organic carrier E

[0039] Mix according to the mass percentage of ethyl cellulose 2.5%, resin 2%, terpineol 60%, diethylene glycol methyl ether 20%, butyl carbitol acetate 14.5%, lecithin 1%, and heat to 70-90 degree, so that the cellulose and resin are completely dissolved to form a transparent organic carrier F.

[0040] 3) Glass powder G

[0041] B 2 O 3 -SiO 2 -PbO series glass powder, average fineness 3.9μm, softening point 500℃.

[0042] According to the mass percentage, take aluminum powder D 72.5% for solar cell electrod...

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Abstract

The invention discloses paste for forming solar battery electrode, which comprises the following components by mass percent: 65 to 75 percent of aluminum powder, 20 to 30 percent of organic carrier, 0.2 to 6 percent of inorganic glass powder and 0.5 to 1 percent of functional additive. The aluminum powder comprises at least two types, the average particle diameter of one type of the aluminum powder is smaller than 2 micro meters and the mass of the type of the aluminum powder is 1 to 10 percent of that of the aluminum powder. The paste can form back surface field effect required by a solar battery with a silicon substrate, and has the advantages that the electrical conductivity is good, the contact resistance is low, the adhering to the silicon substrate is firm, the silicon substrate is slightly bent, and the open-circuit voltage of the solar battery and the photoelectric conversion efficiency are high.

Description

technical field [0001] The present invention relates to a paste for forming a solar cell electrode. Background technique [0002] With the rapid development of solar technology, improving the photoelectric conversion efficiency of solar cells and reducing production costs have become the main goals of research and development in the solar cell industry. The thinning of silicon substrate materials is one of the important means to save materials and reduce costs. However, the thin silicon wafer has poor resistance to bending stress, and the substrate is greatly bent after the backside aluminum electrode is sintered and formed, resulting in an increase in the breakage rate during the production process of the module. [0003] In the past, the back electrode paste of silicon solar cells usually uses aluminum powder with an average particle size of 2 to 10 μm, and the printing thickness is 20 to 25 μm. If the bending of the thin silicon substrate is to be suppressed, the printin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/18H01B1/22H01B1/02
CPCY02P70/50
Inventor 张宏徐晓宙徐传骧徐晓斌
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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