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Preparation process for lead-free front electrode silver paste of solar cell

A technology for solar cells and front electrodes, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve poor wettability, difficulty in achieving the performance of lead-containing glass powder, high glass transition temperature, etc. problem, to achieve the effect of good wettability, good contact and low glass viscosity

Active Publication Date: 2015-12-02
SUZHOU ISILVER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been many studies on lead-free glass powder suitable for solar cells, but it is difficult to meet or exceed the performance of lead-containing glass powder, mainly due to the problems of high glass transition temperature and poor wettability

Method used

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  • Preparation process for lead-free front electrode silver paste of solar cell
  • Preparation process for lead-free front electrode silver paste of solar cell
  • Preparation process for lead-free front electrode silver paste of solar cell

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Embodiment 1~5

[0020] Embodiments 1 to 5: A preparation process for a lead-free front electrode silver paste for solar cells, the front silver conductive paste is composed of the following components by weight, as shown in Table 1:

[0021] Table 1

[0022]

[0023] The oxide additive is composed of the following components by weight, as shown in Table 2:

[0024] Table 2

[0025]

[0026] The above-mentioned organic solvent is at least one of terpineol, butyl carbitol, butyl carbitol acetate and propylene glycol methyl ether acetate.

[0027] The above-mentioned silver conductive phase is 0.5-10 micron silver powder.

[0028] The preparation process of the above-mentioned lead-free positive electrode silver paste for solar cells comprises the following steps:

[0029] Step 1. Add 0.3~0.6 parts of sodium oxide, 0.7~1.3 parts of tellurium dioxide, 0.55~1 part of tungsten trioxide, 0.25~0.5 parts of oxide additives, 0.08~0.2 parts of silicon dioxide, and 0.04~0.1 parts of lithium oxid...

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Abstract

The invention discloses a preparation process for the lead-free front electrode silver paste of a solar cell. The process comprises the steps of 1, placing sodium oxide, tellurium dioxide, tungsten trioxide, silicon dioxide, lithium oxide, and oxide additives in a blender mixer to uniformly mix up the materials, placing the above materials in a muffle furnace to fully melt and adulterate the materials, and subjecting the materials to the water-quenching and annealing treatment to obtain the water-quenched glass frit; 2, grinding the water-quenched glass frit obtained in the step 1 in an alcohol system in a planet type grinding machine to obtain glass powder; 3, stirring an organic solvent, ethyl cellulose, butyl cellulose and hydroxy cellulose to obtain a carrier; uniformly mixing up a silver conductive phase, the glass powder obtained in the step 2 and the carrier obtained in the step 3, stirring, grinding and filtering the mixture to obtain the lead-free front electrode silver paste of the solar cell. According to the invention, the performances in the prior art are maintained, while the glass is low in viscosity and good in wettability with other components. After the printing and sintering process of the paste, the paste is good in contractility and does not easily diffuse. Therefore, the fineness of printed graphics is improved.

Description

technical field [0001] The invention relates to a front silver conductive paste of a crystalline silicon solar cell, belonging to the technical field of solar cell functional materials. Background technique [0002] The depletion of traditional energy sources and the increasingly severe environmental pollution caused by them have become more and more prominent. The use of solar power to generate electricity has made great progress in recent years. Solar photovoltaic cells convert solar energy into electrical energy through the photoelectric effect. Its working principle is generally: an N-type layer is formed by diffusion on a P-type substrate, and a P-N junction is formed at the critical point. When light irradiates the P-N junction, photogenerated carriers will be generated, and the carriers will be exported to the battery through a good conductor material. , so as to form current generation. This kind of good conductor material is the front electrode silver paste, the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22H01B1/16H01L31/0224
Inventor 周欣山汪山包娜
Owner SUZHOU ISILVER MATERIALS
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