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Crystalline silicon solar cell front electrode electrocondution slurry and preparation method thereof

A technology of solar cells and front electrodes, applied in the field of solar cells, can solve the problems of difficult glass powder and paste production, narrow process window, etc., and achieve the effects of enhanced contact, good ohmic contact, and stable structure

Active Publication Date: 2014-01-29
SOLTRIUM ADVANCED MATERIALS TECH LTD SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, no matter what kind of glass frit system, subject to the constraints of the physical properties of the glass frit itself, there are still the above problems, which makes it difficult to make suitable glass frit and paste, and the use process window is narrow

Method used

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  • Crystalline silicon solar cell front electrode electrocondution slurry and preparation method thereof
  • Crystalline silicon solar cell front electrode electrocondution slurry and preparation method thereof
  • Crystalline silicon solar cell front electrode electrocondution slurry and preparation method thereof

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preparation example Construction

[0075] figure 2It is a schematic flow chart of the method for preparing the front electrode of a crystalline silicon solar cell by using the above-mentioned conductive paste. The method for preparing the front electrode of a high-performance crystalline silicon solar cell provided by the embodiment of the present invention includes the following steps:

[0076] S04, providing a crystalline silicon semiconductor element with an insulating film on the upper surface, wherein the insulating film is a stacked layer of at least one of silicon nitride, titanium oxide, aluminum oxide, and silicon oxide;

[0077] S05, printing the conductive paste on the front electrode of the crystalline silicon solar cell on the insulating film in step S04;

[0078] S06, sintering; the sintering step is: drying the conductive paste printed on the insulating film at 180°C to 260°C, heating to 720°C to 900°C for sintering, and during the sintering process, the corrosion The etchant becomes liquid and...

Embodiment example 1

[0124] Exemplary Implementation Case 1: First, 14g TeO 2 and 8.75g Pb 3 o 4 Mix the oxide powders, then add 0.75g Al 2 o 3 and 1.5g Li 2 CO 3 The oxide powder is further mixed evenly, then placed in a crucible, put into a heating furnace, heated to 900°C, and reacted in a molten state for 60 minutes in an air atmosphere at 900°C, and then the molten mixture Take it out from the furnace and let it cool naturally in the atmosphere to form a block. The obtained blocks are pulverized to obtain small particles, and the small particles are ball milled to form a powder, and the ball milled powder is in the range of 0.1-15 μm to obtain its crystal compound. The molten mixture had a temperature of 900°C in the furnace and dropped to 732°C after removal from the furnace. Figure 5 It is the relationship between the cooling time and temperature of the molten mixture after it is taken out of the furnace. The record starts from 732°C. It can be seen that it is cooled from 732°C to 5...

Embodiment example 1

[0125] Comparative Implementation Case 1: First, 14g TeO 2 and 8.75g Pb 3 o 4 Mix the oxide powders, then add 0.75g Al 2 o 3 and 1.5g Li 2 CO 3 The oxide powder is further uniformly mixed, then placed in a crucible, placed in a heating furnace, heated to 900°C, and reacted in a molten state for 60 minutes in an air atmosphere at 900°C, and then the molten The mixture was removed from the furnace and quenched by pouring into deionized water at 25°C to obtain a block. The obtained block is crushed to obtain small particles, and the small particles are then ball milled to form a powder, and the ball milled powder D 50 In the range of 0.1-15 μm, glass powder is obtained. The glass powder prepared in the above-mentioned implementation case has been analyzed and tested by XRD, and the results are as follows: Figure 6b shown. Depend on Figure 6b It can be seen that the XRD test of the glass powder shows a bulge with a wide distribution and low intensity, without showing a...

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Abstract

The invention discloses crystalline silicon solar cell front electrode electrocondution slurry and a preparation method of the crystalline silicon solar cell front electrode electrocondution slurry. The crystalline silicon solar cell front electrode electrocondution slurry is composed of a corrosion etching agent, metal powder, an organic carrier and glass powder; the corrosion etching agent is a compound of one or more crystals, and the melting temperature of the corrosion etching agent ranges from 250 DEG C to 760 DEG C; the glass powder is of a non-crystal structure. In the sintering process of the electrode electrocondution slurry, the corrosion etching agent directly turns into a liquid from a solid so that the corrosion etching agent can flow easily; in coordination with the softened glass powder, the corrosion etching agent can easily etch and penetrate through an antireflection insulating layer on the front of a crystalline silicon solar cell so that the conductive metal powder and the crystalline silicon solar cell can form good ohmic contact; moreover, the conductive metal powder can be wetted, contact between the metal powder can be enhanced, and therefore a crystalline silicon solar cell front electrode with excellent conductivity is formed.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a conductive paste for front electrodes of crystalline silicon solar cells and a preparation method thereof. Background technique [0002] Solar energy is an inexhaustible clean energy. With the depletion of non-renewable energy such as coal and oil, the development and utilization of solar energy has become a hot spot. Solar cells are an important means of utilizing solar energy. Among them, the crystalline silicon solar cell that has been industrialized is one of the solar cells. [0003] As the core component of crystalline silicon solar cells, in order to collect and export the current generated under the light, the cells need to make an electrode on the front and back respectively. There are many ways to manufacture electrodes, and screen printing and co-firing are the most common production processes at present. [0004] The conductive paste for the front ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/18
CPCY02P70/50
Inventor 刘小丽郭冉李德林
Owner SOLTRIUM ADVANCED MATERIALS TECH LTD SHENZHEN
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