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High-adhesion solar cell leadless aluminum paste

A technology of solar cells and high adhesion, applied in the field of solar cells, can solve the problems of low warpage and strong adhesion, great harm to the human body, low photoelectric conversion efficiency, etc., to achieve electrical performance and conversion efficiency improvement, printing process The effect of network performance improvement and improved interconnectivity

Inactive Publication Date: 2017-01-04
JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The organic binder in the slurry contains low-toxic substances, which volatilizes seriously during the preparation process, has low efficiency, and is very harmful to the human body;
[0006] (2) Inorganic adhesive metal glass powder contains toxic elements such as lead, which is harmful to the environment and human body to a certain extent;
[0007] (3) Good ohmic contact cannot be formed between the aluminum film and the silicon substrate, and it is easy to fall off and blister, resulting in low photoelectric conversion efficiency;
[0008] (4) In order to reduce the cost of crystalline silicon solar cells, the requirements of low warpage and strong adhesion cannot be met at the same time

Method used

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  • High-adhesion solar cell leadless aluminum paste
  • High-adhesion solar cell leadless aluminum paste
  • High-adhesion solar cell leadless aluminum paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Aluminum powder

[0019] Aluminum powder purity > 99.9%, 1-2um spherical aluminum powder, tap density ≥ 1.1g / cm 3 , the oxygen content is 1.3-1.8, the tap density of 3-4um spherical aluminum powder is 1.30g / cm 3 , the oxygen content is 0.6-0.9, the tap density of 5-7um spherical aluminum powder is 1.45g / cm 3 , the oxygen content is 0.30-0.40 and the shape is spherical.

[0020] 2. Preparation of organic binder

[0021] Weigh polyol 50%, cellulose 5%, polylactic acid 4%, isooctyl acrylate 4%, acrylamide 6%, surfactant 3%, turpentine 15%, organic compound 8%, sorbitan stearic acid 5% ester, after mixing the above materials, heat to 80-100°C and dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0022] 3. Preparation of lead-free glass powder

[0023] Bismuth oxide 25%, boron oxide 5%, silicon oxide 25%, zinc oxide 16%, calcium oxide 5%, antimony oxide 5%, tin oxide 5%, aluminum oxide 1%, barium carbonate 10%, lanthanum...

Embodiment 2

[0032] 1. Aluminum powder

[0033] Aluminum powder purity > 99.9%, 1-2um spherical aluminum powder, tap density ≥ 1.1g / cm 3 , the oxygen content is 1.3-1.8, the tap density of 3-4um spherical aluminum powder is 1.30g / cm 3 , the oxygen content is 0.6-0.9, the tap density of 5-7um spherical aluminum powder is 1.45g / cm 3 , the oxygen content is 0.30-0.40 and the shape is spherical.

[0034] 2. Preparation of organic binder

[0035] Polyol 55%, Cellulose 5%, Polylactic Acid 4%, Isooctyl Acrylate 4%, Acrylamide 6%, Surfactant 3%, Turpentine 10%, Organic Compound 7%, Sorbitan Stearate 6 %, the above materials are mixed and heated to 80-100°C to dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0036] 3. Preparation of lead-free glass powder

[0037] Bismuth oxide 20%, boron oxide 8%, silicon oxide 22%, zinc oxide 20%, calcium oxide 4%, antimony oxide 5%, tin oxide 5%, aluminum oxide 1%, barium carbonate 12%, lanthanum oxide 3%, Af...

Embodiment 3

[0046] 1. Aluminum powder

[0047] Aluminum powder purity > 99.9%, 1-2um spherical aluminum powder, tap density ≥ 1.1g / cm 3 , the oxygen content is 1.3-1.8, the tap density of 3-4um spherical aluminum powder is 1.30g / cm 3 , the oxygen content is 0.6-0.9, the tap density of 5-7um spherical aluminum powder is 1.45g / cm 3 , the oxygen content is 0.30-0.40 and the shape is spherical.

[0048] 2. Preparation of organic binder

[0049] Polyol 60%, Cellulose 6%, Polylactic Acid 4%, Isooctyl Acrylate 4%, Acrylamide 6%, Surfactant 3%, Turpentine 10%, Organic Compound 5%, Sorbitan Stearate 2 %, the above materials are mixed and heated to 80-100°C to dissolve for 100 minutes to obtain a transparent colloid with good lubricity and printability.

[0050] 3. Preparation of lead-free glass powder

[0051] Bismuth oxide 22%, boron oxide 7%, silicon oxide 23%, zinc oxide 17%, calcium oxide 4%, antimony oxide 5%, tin oxide 5%, aluminum oxide 1.5%, barium carbonate 11%, lanthanum oxide 4.5%,...

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Abstract

The invention relates to high-adhesion solar cell aluminum paste. The raw material components and the weight content of the leadless aluminum paste are listed as follows: 75-90 parts of aluminum powder, 15-30% of organic adhesive agent and 1-10% of leadless glass powder, wherein the sum of the weight percent of all the components is 100%. The leadless aluminum paste has the advantages that the leadless aluminum paste has no lead or other toxic substance and has little harm to the human body, great ohmic contact can be formed between an aluminum film and a silicon chip, the warping degree is low, boiling fastness is great, the photoelectric conversion efficiency is high and the leadless aluminum paste is not liable to fall off.

Description

technical field [0001] The invention relates to a back field aluminum paste of a crystalline silicon solar cell, belonging to the technical field of solar cells. Background technique [0002] Solar energy is a kind of green energy. People pay more and more attention to it because of its advantages of non-pollution, inexhaustibility, and not limited by geographical resources, so solar cells emerge as the times require. A crystalline silicon solar cell is a device that can respond to light energy and convert light energy into electrical energy. It can convert light energy into electrical energy by using the photovoltaic effect. The back field aluminum paste of crystalline silicon solar cells is mainly composed of aluminum powder, organic binder and inorganic binder-metal glass powder. Aluminum powder is used as the functional phase in the aluminum electrode paste. After sintering, the aluminum powder is connected to each other to form a conductive channel, and forms a silicon...

Claims

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Application Information

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IPC IPC(8): H01B1/22
Inventor 郭宏彬
Owner JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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