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A solar cell back aluminum paste with a wide sintering process window

A technology for solar cells and process windows, applied in the field of back aluminum paste for solar cells, can solve problems such as unfavorable market competition, and achieve the effects of reducing production costs, improving electrical performance, and increasing open circuit voltage

Active Publication Date: 2015-11-11
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of dopants accounts for 10-20% of the cost of aluminum paste, which is not conducive to market competition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A solar cell back aluminum paste with a wide sintering process window, the components and their weight percentages are: 40% of coarse aluminum powder with an average particle size of 4-6 μm, 30% of fine aluminum powder with an average particle size of less than 3 μm, Inorganic binder 4%, dopant 5.9%, ethyl cellulose 15%, butyl carbitol 5%, diethyl phthalate 0.1%. Wherein, the inorganic binder is made up of glass powder A of 40% and glass powder B of 60% by weight percentage, and the softening point of glass powder A is less than the softening point of glass powder B; The composition and weight percentage of glass powder A are: 34% lead oxide, 15% boron oxide, 29% silicon oxide, 20% zinc oxide, 1% calcium oxide, 1% tin oxide; the composition and weight percentage of glass powder B are: bismuth oxide 20%, boron oxide 15% , 29% silicon oxide, 30% zinc oxide, 1% calcium oxide, and 5% tin oxide; the median particle size of glass powder A and glass powder B is <2μm, and the m...

Embodiment 2

[0019] A solar cell back aluminum paste with a wide sintering process window, the components and their weight percentages are: 50% of coarse aluminum powder with an average particle size of 4-6 μm, 10% of fine aluminum powder with an average particle size of less than 3 μm, Inorganic binder 2%, dopant 7.5%, acrylic resin 10%, butyl carbitol acetate 20%, dibutyl phthalate 0.5%. Wherein, the inorganic binder is made up of glass powder A of 60% and glass powder B of 40% by weight percentage, and the softening point of glass powder A is less than the softening point of glass powder B; The composition and weight percentage of glass powder A are: Lead oxide 50%, boron oxide 5%, silicon oxide 21%, zinc oxide 9%, calcium oxide 10%, tin oxide 5%; the composition and weight percentage of glass powder B are: bismuth oxide 40%, boron oxide 5% , 21% silicon oxide, 23% zinc oxide, 10% calcium oxide, and 1% tin oxide; the median particle size of glass powder A and glass powder B is <2μm, and...

Embodiment 3

[0021] A solar cell back aluminum paste with a wide sintering process window, the components and their weight percentages are: 43% of coarse aluminum powder with an average particle size of 4-6 μm, 20% of fine aluminum powder with an average particle size of less than 3 μm, Inorganic binder 1%, dopant 10%, ethyl cellulose 12%, terpineol 13%, diethyl phthalate 1%. Wherein, the inorganic binder is made up of 50% glass powder A and 50% glass powder B by weight percentage, and the softening point of glass powder A is less than the softening point of glass powder B; the composition and weight percentage of glass powder A are: 30% lead oxide, 12% boron oxide, 27% silicon oxide, 16% zinc oxide, 10% calcium oxide, 5% tin oxide; the composition and weight percentage of glass powder B are: bismuth oxide 30%, boron oxide 12% , 27% silicon oxide, 19% zinc oxide, 10% calcium oxide, and 2% tin oxide; the median particle size of glass powder A and glass powder B is <2μm, and the maximum part...

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Abstract

The invention relates to solar cell aluminum-backed slurry with a wide sintering process window. The slurry is composed of, by weight, 40-50% of coarse aluminum powder with the average grain size of 4-6um, 10-30% of fine aluminum powder with the average grain size of 3um, 0.5-4% of inorganic binder, 0.1-10% of dopant, 10-15% of organic carriers, 5-20% of solvent and balance of auxiliaries, where the sum of weight percentage of components is 100%, the inorganic binder is composed of two kinds of glass powder different in softening point, and the dopant is aluminum-boron alloy powder. A mixture of the coarse aluminum powder and the fine aluminum powder is adopted as a conductive part, so that a compact aluminum back surface field can be formed within a wide sintering temperature range; the inorganic binder can effectively bond aluminum powder different in sintering activity; and the dopant can promote forming of a P+aluminum back surface field, improve open-circuit voltage of a cell and simultaneously further improve the sintering process window of the aluminum-backed slurry.

Description

technical field [0001] The invention relates to a conductive paste, in particular to a solar battery back aluminum paste with a wide sintering process window. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electricity. The solar cell back aluminum paste is the main component of the solar cell electronic paste, and it is mainly used to make the back electric field in the production of solar cells. During the sintering process, the aluminum powder particles in the back aluminum paste and the silicon substrate form a silicon aluminum alloy and form an aluminum-doped P+ epitaxial layer on the surface of the silicon, that is, the aluminum back field. The role of the aluminum back field is mainly to reduce the surface recombination rate of the back electric field, increase the minority carrier lifetime, and thereby increase the open circuit voltage. When considering the comprehensive performance of the back-aluminum paste, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B1/16H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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