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A kind of positive silver paste for crystalline silicon solar cell and its preparation method and application
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A technology of solar cells and crystalline silicon, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as insufficient adhesion, failure to meet requirements, unqualified cells, etc., achieve high low-temperature sintering window, meet environmental protection requirements, The effect of excellent contact resistance
Active Publication Date: 2020-07-24
苏州博望新能源科技有限公司
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[0004] With the development of solar energy technology, the market has higher and higher requirements for high soldering force, excellent solderability, and long service life of battery components. At present, the glass powder used in the front silver paste on the market has more or less insufficient adhesion. , or just can only meet the minimum requirements of customers, and the solar cell tension cannot meet the requirements, then the cells cannot be packaged into components, which will cause the production of cells to be unqualified, or seriously affect the service life of the cells. This is because most of the solar cells used in the market The front silver paste glass powder is mostly low-lead or high-lead glass powder. The lead oxide in the glass powder has an efficient effect on ablation of the anti-reflection silicon nitride glass layer and melting silver powder, and the lead-containing system glass powder has good Fluidity and wettability, can realize more optimized Ag-Si ohmic contact, realize more optimized electrode grid line resistance and contact resistance, so as to realize the requirement of maximizing the electrical performance of solar cells, so most of the glass frit used in the front silver paste It is a lead-containing system, but the negative effect is that lead-containing will cause the adhesion of silver electrodes to decrease, and at the same time cause pollution to the environment, which is not conducive to the current high standard requirements for environmental protection
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Embodiment 1
[0039] The present embodiment provides a kind of glass powder, and its raw material comprises: TeO 2 41.5 parts, SiO 2 15 copies, B 2 o 3 15 copies, Bi 2 o 3 2 parts, Na 2 CO 3 0.5 parts, MgO 6 parts, Al 2 o 3 4.5 parts, ZrO 2 4.5 parts, Ag 2 O 4 parts, ZnO 3.5 parts, PtO 2 1.5 parts, Gd 2 o 2 0.5 parts, ReO 2 1.5 servings.
[0040] The preparation method is as follows: (1) Weigh each raw material according to the formula, put it into a mixer and mix it, put it into a crucible, and calcine it in a horse-boiling furnace at 1300±20°C for 50 minutes to obtain molten glass;
[0041] (2) Quenching the glass liquid obtained in step (1) in deionized water, taking out the glass particles after cooling, drying in an oven at 70±5°C for 3 hours, and drying;
[0042] (3) The glass particles prepared in step (2) are subjected to wet ball milling, the ball-to-material ratio is 1:3, the ball milling dispersant is ethanol, the ball milling speed is 400rpm / min, ball mill...
Embodiment 2
[0046] The present embodiment provides a kind of glass powder, and its raw material comprises: TeO 2 45 parts, SiO 2 20 copies, B 2 o 3 10 copies, Bi 2 o 3 3 parts, Na 2 CO 3 0.5 parts, MgO 7 parts, Al 2 o 3 2 parts, ZrO 2 2.5 parts, Ag 2 O 4 parts, ZnO 3 parts, PtO 2 1 part, MoO 0.5 part, Nb 2 o 5 0.5 parts, Gd 2 o 2 0.5 parts, Y 2 o 3 0.5 servings.
[0047] The preparation method is the same as in Example 1.
Embodiment 3
[0049] The present embodiment provides a kind of glass powder, and its raw material comprises: TeO 2 47 parts, SiO 2 25 copies, Bi 2 o 3 5.5 parts, MgO7.5 parts, Al 2 o 3 3 parts, ZrO 2 1.5 parts, Ag 2 O 3.5 parts, ZnO 2 parts, PtO 2 2 parts, MoO 0.5 parts, Nb 2 o 5 0.5 parts, Gd 2 o 2 1 part, ReO 2 0.5 parts, Y 2 o 3 0.5 servings.
[0050] The preparation method is the same as in Example 1.
[0051] The physical performance tests and index data of the glass frits in Examples 1-3 are detailed in Table 1 below.
[0052] Table 1
[0053]
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Abstract
The invention discloses front silver paste for a crystalline silicon solar cell, and a preparation method and application thereof. The front silver paste for crystalline silicon solar cell includes anorganic carrier, an organic auxiliary agent, glass powder and silver powder, wherein the raw material of the glass powder comprises TeO2, an adhesion additive, Bi2O3, MgO, Ag2O and ZnO, and optionally includes one or more of Al2O3, ZrO2, R2O, PtO2 and MoO; the adhesion additive is one or more selected from oxides of Si, P, B or Ge; and R2O is one or more selected from oxides or salts of Li, Na orK. The preparation method of the front silver paste for a crystalline silicon solar cell includes the steps: weighing each component according to the formula, mixing the components, grinding the mixture until the particle size of the paste is less than 5 mu m, and controlling the viscosity of the paste, thus completing preparation. The invention also relates to an application for preparation of the passivation crystalline silicon solar cell. The front silver paste for a crystalline silicon solar cell can realize high welding adhesion between a front silver electrode and a welding strip whilemaximizing the electrical performance of the solar cell, and the cell pack has a long service life.
Description
technical field [0001] The invention belongs to the technical field of crystalline silicon solar photovoltaic cells, in particular to front silver paste for back passivation crystalline silicon solar cells, in particular to a front silver paste for crystalline silicon solar cells and its preparation method and application. Background technique [0002] Crystalline silicon solar cells are devices that convert light energy into electrical energy for daily use through the photoelectric conversion effect of the P-N junction. The production process of conventional crystalline silicon solar cells includes: texturing of silicon wafers, diffusion of P-N junctions, removal of phospho-silicate glass, PECVD anti-reflection coating, screen printing of back field aluminum layer, back electrode and positive electrode, sintering and drying, etc. . In order to improve the electrical performance of conventional solar cells, the back field passivation technology is introduced, that is, the e...
Claims
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Application Information
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