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Environment-friendly crystalline silicon solar-cell back surface field silver-aluminium paste and preparation method thereof

A technology of solar cells and crystalline silicon, which is applied in circuits, electrical components, semiconductor devices, etc., and can solve problems such as limited use and large pollution

Inactive Publication Date: 2011-04-20
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The environmental standards of the electronic paste industry follow the EU RoHS directive (excluding Pb, Cd, Hg, Cr(VI), polybrominated biphenyl PBB, polybrominated diphenyl ether PBDE) and the EU RoHS directive 2005 / 84 / EC on phthalates Among them, the back-field silver paste and silver-aluminum paste of crystalline silicon solar cells are currently used in more than 150 tons annually in China, and with the growth of the photovoltaic industry, the existing lead-containing back-field silver-aluminum paste is becoming more and more polluting to the environment large, its use will gradually be limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of environmentally friendly glass binder

[0029] Weigh the raw materials according to the components and mass percentages in Example 1 in Table 2, mix them evenly, and transfer them to a high-temperature furnace. ~2 microns, and finally pass through a 200-mesh sieve to obtain a binder that does not contain harmful substances such as Pb, Cd, Hg, and Cr(VI);

[0030] (2) Preparation of organic carrier

[0031] Add 10% ethyl cellulose resin to 90% organic solvent by weight percentage, then place it in a constant temperature water tank at 75°C to completely dissolve the ethyl cellulose resin in the organic solvent, and finally filter to obtain the organic solvent. Carrier; the organic solvent is composed of 50% butyl carbitol by weight and 50% propylene glycol methyl ether acetate by weight;

[0032] (3) Preparation of back electric field silver aluminum paste

[0033] According to the components listed in Table 1 and the mass percent, get the ultrafine ...

Embodiment 2

[0035] (1) Preparation of environmentally friendly glass binder

[0036] Weigh the raw materials according to the components and mass percentages in Example 2 in Table 2, mix them evenly, transfer them to a high-temperature furnace, and keep them warm for 60 minutes at 900°C, then quench them with deionized water, and ball mill them to 0.5 ~2 microns, and finally pass through a 400-mesh sieve to obtain a binder that does not contain harmful substances such as Pb, Cd, Hg, and Cr(VI);

[0037] (2) Preparation of organic carrier

[0038] Add 30% of ethyl cellulose resin to 70% organic solvent by weight, and then place it in a constant temperature water tank at 100°C to completely dissolve the ethyl cellulose resin in the organic solvent, and finally filter it to obtain the organic solvent. Carrier; the organic solvent is 10% by weight of propylene glycol methyl ether acetate, 50% by weight of ethylene glycol ether, 30% by weight of ethylene glycol monobutyl ether acetate, and 5%...

Embodiment 3

[0042] (1) Preparation of environmentally friendly glass binder

[0043] Weigh the raw materials according to the components and mass percentages in Example 3 in Table 1, mix them evenly and transfer them to a high-temperature furnace. ~2 microns, and finally pass through a 300-mesh sieve to obtain a binder that does not contain harmful substances such as Pb, Cd, Hg, and Cr(VI);

[0044] (2) Preparation of organic carrier

[0045] Add 20% of ethyl cellulose resin to 80% organic solvent by weight percentage, and then place it in a constant temperature water tank at 95°C to completely dissolve the ethyl cellulose resin in the organic solvent, and finally filter it to obtain the organic solvent. Carrier; The organic solvent is ethylene glycol monobutyl ether acetate;

[0046] (3) Preparation of back electric field silver aluminum paste

[0047]According to the components listed in Table 1 and the mass percentage, the superfine silver powder of 0.2-1 micron, the aluminum powder...

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Abstract

The invention discloses an environment-friendly crystalline silicon solar-cell back surface field silver-aluminium paste and a preparation method thereof. The silver-aluminium paste comprises the following components in percentage by weight: 15-35% of silver powder, 30-70% of aluminium powder, 10-15% of organic carrier, 1-5% of adhesive, 3.5-13% of solvent and 0.5-2% of dispersant. The organic carrier is prepared by dissolving 10-30% of ethyl cellulose resin in 70-90% of organic solvent. In the paste, environment-friendly glass powder without harmful substances is used as the adhesive, and an environment-friendly organic reagent is used as a solvent and a diluter; and thus, the prepared silver-aluminium paste does not contain six substances (Pb, Cd, Hg, Cr(VI), polybrominated diphenyl PBB and polybrominated diphenyl ether PBDE) inhibited by European Union RoHS Instruction, completely conforms to the Instruction 2005 / 84 / EC on phthalic ester in European Union RoHS, realizes environment friendliness in deed, and is beneficial to the import and export of solar cells made in China and raw materials of the cells.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to an environment-friendly crystalline silicon solar cell back electric field silver-aluminum paste and a preparation method thereof. Background technique [0002] Solar photovoltaic power generation technology, as the most significant technology in the utilization of solar energy, has become a hotspot in the research and application of countries all over the world. In the past 10 years, it has been increasing at an average annual rate of 30%, and in the last 3 years, it has grown at a rate of more than 50% per year. Solar photovoltaic power generation has become the fastest and largest industry in the field of renewable energy after wind power generation. At present, the solar cells in photovoltaic power generation are still dominated by crystalline silicon solar cells, with a market share of 90%, and the efficiency of large-area commercialized solar cells can reach 1...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/50
Inventor 李驰
Owner IRICO
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