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Glass powder for front silver paste of crystalline silicon solar cells and preparation method of glass powder

A solar cell and glass powder technology, which is applied in the field of glass powder preparation for front silver paste of crystalline silicon solar cells, can solve problems affecting the photoelectric conversion efficiency of crystalline silicon solar cells, the thermal expansion coefficient does not match with silicon wafers, and the adhesion between paste and silicon wafers. Focus on problems such as poor strength to achieve high photoelectric conversion rate, low softening point, and low cost

Inactive Publication Date: 2018-05-29
(CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are lead-free glass powders in the glass powder for crystalline silicon solar cells on the market, the product quality is prone to problems such as high melting point, thermal expansion coefficient that does not match the silicon wafer, or poor adhesion between the paste and the silicon wafer, which in turn affects the quality of the crystal silicon solar cell. Photoelectric conversion efficiency of silicon solar cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh Bi by mass parts 2 o 3 30 copies, B 2 o 3 20 parts, ZnO 28 parts, SiO 2 1 part, BaO 10 parts, Al 2 o 3 1 part, MgO 6 parts, TiO 2 3 parts, Ag 2 O 1 part, fully mixed in the mixer for 30min;

[0019] (2) Melting: Install the crucible in the resistance furnace, raise the temperature to the predetermined temperature of 1250°C according to the step temperature system (before 900°C at 8°C / min, and after 900°C at 5°C / min), add step (1 ) prepared mixture, heat preservation for 90min to obtain clear glass liquid;

[0020] (3) Quench the molten glass in deionized water, take it out, and dry it in a drying oven at 120°C for 12 hours;

[0021] (4) Put the dried glass into a ball mill for 72 hours and pass through a 300-mesh sieve to obtain the glass powder for the front silver paste of the crystalline silicon solar cell.

Embodiment 2

[0023] (1) Weigh Bi by mass parts 2 o 3 45 copies, B 2 o 3 16 parts, ZnO 23 parts, SiO 2 2 parts, BaO 5 parts, Al 2 o 3 2 parts, MgO 4 parts, TiO 2 2 parts, Ag 2 O 1 part, fully mixed in a mixer for 30min to obtain a mixture;

[0024] (2) Install the crucible in the resistance furnace, raise the temperature to the predetermined temperature of 1200°C according to the step temperature system (before 900°C at 8°C / min, after 900°C at 5°C / min), add step (1) to obtain The mixture was kept warm for 30 minutes to obtain clear glass liquid;

[0025] (3) Quench the molten glass in deionized water, take it out, and dry it in a drying oven at 120°C for 12 hours;

[0026] (4) Put the dried glass into a ball mill for 72 hours and pass through a 300-mesh sieve to obtain the glass powder for the silver paste on the front side of the crystalline silicon solar cell.

Embodiment 3

[0028] (1) Weigh Bi by mass parts 2 o 3 55.B 2 o 3 15. ZnO 20 parts, SiO 2 2 parts, BaO 2 parts, Al 2 o 3 0 parts, MgO 3 parts, TiO 2 2 parts, Ag 2 O 1 part, fully mixed in a mixer for 30min to obtain a mixture;

[0029] (2) Install the crucible in the resistance furnace, raise the temperature to the predetermined temperature of 1150°C according to the step temperature system (before 900°C at 8°C / min, after 900°C at 5°C / min), add step (1) to obtain The mixture was kept warm for 40 minutes to obtain clear glass liquid;

[0030] (3) Quench the molten glass in deionized water, take it out, and dry it in a drying oven at 120°C for 12 hours;

[0031] (4) Put the dried glass into a ball mill for 60 hours and pass through a 300-mesh sieve to obtain glass powder for silver paste on the front side of crystalline silicon solar cells.

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Abstract

The invention relates to glass powder for front silver paste of crystalline silicon solar cells and a preparation method of the glass powder. The glass powder is characterized by being prepared formula raw materials in parts by mass as follows: 30-80 parts of Bi2O3, 0.1-20 parts of B2O3, 5-30 parts of ZnO, 1-15 parts of SiO2, 0.1-20 parts of BaO, 0-8 parts of Al2O3, 0-6 parts of MgO, 0-5 parts ofTiO2 and 0.1-3 parts of Ag2O. The preparation method comprises the steps as follows: a, the formula raw materials are weighed in parts by mass and uniformly mixed, and a mixture is prepared; b, a crucible is mounted in a resistance furnace, the temperature is increased to 900-1,300 DEG C, the mixture is added, thermal insulation is performed, and clear molten glass is obtained; c, the molten glassis quenched in deionized water, then taken out and dried; d, dried glass is subjected to ball milling and sieving. The glass powder has the advantages as follows: the glass powder for front silver paste of the crystalline silicon solar cells has simple raw material composition and lower cost, contains no lead, vanadium, thallium, tellurium and other harmful elements, conforms to the environmentalprotection requirement, has lower softening point and proper thermal expansion coefficient, has the expansion coefficient matched with a silicon wafer and has low shrinkage rate and high adhesion. Silver paste prepared from the glass powder has high photoelectric conversion rate after being sintered.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to glass powder for front silver paste of crystalline silicon solar cells, and also relates to a preparation method of glass powder for front silver paste of crystalline silicon solar cells. Background technique [0002] my country is rich in solar energy resources and has favorable conditions for developing the photovoltaic industry. At present, China has become the largest terminal market for photovoltaics in the world. The front silver paste has an important influence on the photoelectric conversion efficiency of the solar cell, and the low-melting point glass frit as the binder phase of the silver paste is an important part of the silver paste, which can play a good bonding effect on the silicon wafer in the solar cell , to ensure the bonding strength between the film layer and the substrate. The content of low-melting point glass powder in silver paste is generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
CPCC03C12/00
Inventor 彭寿王巍巍马立云操芳芳王萍萍高强赵凤阳曹欣仲召进单传丽石丽芬倪嘉韩娜崔介东
Owner (CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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