Low-resistance high-efficiency lead-free back silver pulp for amorphous silicon solar battery

A solar cell, low-resistance and high-efficiency technology, applied in the field of solar energy, can solve the problems of rising series resistance of cells, high series resistance of cells, weak ability to form alloys or eutectics, etc., to improve thermal expansion and contraction performance, and improve photoelectric conversion Efficiency, the effect of reducing the probability of cracks

Active Publication Date: 2015-04-08
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream back silver paste in the market has the following deficiencies: After the back silver paste is printed and sintered, cracks appear on the surface and inside of the overlapping parts of the back silver electrode and the aluminum electrode, which affects the conduction between the silver and aluminum electrodes, resulting in battery failure. The higher the series resistance, the lower the conversion efficiency of the solar cell
Some researchers found that by adding inorganic oxides, such as nano-SiO 2 Such low expansion coefficient materials can reduce the expansion coefficient of aluminum paste and prevent cracks due to sintering shrinkage. However, in practical applications, it is found that the above low expansion coefficient materials will greatly reduce the adhesion of aluminum electrodes, seriously affecting the a...

Method used

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  • Low-resistance high-efficiency lead-free back silver pulp for amorphous silicon solar battery
  • Low-resistance high-efficiency lead-free back silver pulp for amorphous silicon solar battery
  • Low-resistance high-efficiency lead-free back silver pulp for amorphous silicon solar battery

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preparation example Construction

[0025] The preparation method of the present invention comprises the following steps:

[0026] (1) Preparation of inorganic binder

[0027] Weigh the components of the glass powder according to different proportions, put them into the mixer and mix them for 50 minutes, let them stand for 30 minutes, pack them into corundum crucibles, and dry them for 150 minutes at 130°C. Put the dried powder into a horse boiling furnace, and smelt it at 1200°C for 60 minutes to obtain a homogeneous molten glass. The high-temperature glass liquid is extracted with deionized water to obtain block glass. After drying at 150°C, the glass block is ground to below 4 microns to obtain glass powder.

[0028] Mix glass powders with different properties according to a certain ratio, and disperse them with a powder machine at high speed for 3 to 10 minutes to obtain an inorganic binder.

[0029] (2) Preparation of organic binder

[0030] Weigh the organic solvent according to the proportion of the form...

Embodiment 1

[0035] (1) Preparation of organic binder

[0036] Prepare organic solvent, weigh 80g terpineol, 5g diethylene glycol butyl ether, 5g ethyl cellulose, add plasticizer (2g stearic acid, 2g acetyl tributyl citrate, 3g phthalate) , and the remainder was filled up to 100g with butyl carbitol acetate. and heated to 120° C., dissolved for 3 hours to obtain an organic binder, which is set aside.

[0037] (2) Preparation of inorganic binder

[0038] Weigh 60g of B 2 o 3 -SiO 2 -ZnO system lead-free glass binder (softening temperature is 650°C), 40g of Bi 2 o 3 -B 2 o 3 -SiO 2 System lead-free glass binder (softening temperature is 440°C), mix glass powders with different properties in a certain proportion, disperse at high speed with a powder machine for 3-10 minutes, and obtain 100g of inorganic binder.

[0039] (3) Preparation of lead-free back silver paste

[0040] Weigh 6g of inorganic binder, 55g of which has an average particle size of 5μm and a specific surface area o...

Embodiment 2

[0041] Embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, the specific preparation method is the same as embodiment 1, and its formula ratio adjusts according to following table 1-3 formula.

[0042] Table 1

[0043]

[0044] Table 2 A glass powder composition

[0045]

[0046] Table 3 B glass powder composition

[0047]

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PUM

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Abstract

The invention relates to low-resistance high-efficiency lead-free back silver pulp for an amorphous silicon solar battery. The lead-free back silver pulp comprises the following ingredients in percentage by mass: 35 to 65 percent of silver powder, 1 to 6.5 percent of inorganic bonding agents and 30 to 60 percent of organic bonding agents, wherein the silver powder is microcrystal silver powder with the average grain diameter being 0.2 to 3 micrometers, the lead-free glass powder is formed by combining A glass powder with the softening point being 550 to 750 DEG C and B glass powder with the softening point being 400 to 540 DEG C, the A glass powder is preferably the glass powder with the softening point being 600 to 700 DEG C, and the B glass powder is preferably the glass powder with the softening point being 425 to 500 DEG C. A battery cell manufactured by the back sliver pulp provided by the invention has the advantages that a back silver electrode and an aluminum electrode metal fusion layer have no crack gap, the contact resistance of a silver aluminum electrode is small, and the conversion efficiency of the battery cell is high.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a lead-free back silver paste for crystalline silicon solar cells. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Under the condition of light, a photogenerated current is generated inside the solar cell, and the electrical energy is output through the electrodes. In order to maximize the output of photoelectric energy, electrode fabrication becomes an important link. The electrodes of crystalline silicon solar cells include positive silver electrodes, back silver electrodes, and aluminum electrodes. The back silver electrode of crystalline silicon solar cells mainly plays the role of being solderable and forming a conductive path with the aluminum electrode. The conductivity of the back silver electrode and the conductive contact performance with the aluminum electrode also directly affect the convers...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0224
Inventor 刘子英何红伟任明淑马亚男徐建伟王小记柳青赵双林
Owner 乐凯胶片股份有限公司
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