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Front electrode silver paste of crystalline silicon solar battery and preparation method for front electrode silver paste

A technology of solar cells and front electrodes, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of low photoelectric conversion efficiency and large series resistance, and achieve excellent electrical performance indicators , the effect of controlling the degree of corrosion

Active Publication Date: 2013-04-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the defects of large series resistance and low photoelectric conversion efficiency in the existing solar cell front electrode silver paste, thereby providing a solar cell front electrode silver paste with small series resistance and high photoelectric conversion efficiency and a preparation method thereof

Method used

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Examples

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Effect test

preparation example Construction

[0024] The present invention also provides a method for preparing the positive electrode silver paste, the method comprising mixing and grinding the silver powder, the first glass frit powder, the second glass powder and the organic components.

[0025] The method for preparing the front electrode of a solar cell according to the embodiment of the present invention includes the following steps: screen printing the front electrode paste according to the embodiment of the present invention on the light-receiving surface of the semiconductor substrate, drying, and then quickly sintering The front electrode of the solar cell is formed; the peak temperature of the rapid sintering process is 755-765°C, and the peak temperature time is 1-3 seconds.

[0026] The rapid sintering method of the front electrode is a mature metallization process for large-scale industrial production of crystalline silicon solar cells. It generally includes 4 stages: burning organic matter stage, heating stage, p...

Embodiment 1

[0034] 1. Preparation of electrode silver paste

[0035] 79% silver powder, average particle size 0.8 microns; the first glass frit powder 1.5% PbO-B 2 O 3 -SiO 2 (PbO: 85wt%) The average particle size is 1.5 microns, the softening point is 360°C; the second glass frit powder is 3.5%, B 2 O 3 -ZnO-V 2 O 5 , Average particle size 2.5 microns, softening point 620 ℃; pine oil 12%, ethyl cellulose 2%, wetting and dispersing agent 2%.

[0036] The above materials are mixed and ground in a three-roll mill to a fineness of 13 microns to obtain electrode silver paste A1.

[0037] 2. Preparation of polycrystalline silicon solar cells

[0038] First, surface texturing is performed on three P-type polycrystalline silicon wafers with an area of ​​156mm×156mm: the polycrystalline silicon wafers are immersed in a solution of 75°C with a mass percentage of NaOH and ethanol of 20wt% and 10wt% for 40min. Take out the polycrystalline silicon wafer, wash it with deionized water 10 times to wash away the...

Embodiment 2

[0043] Silver powder 83.5%, average particle size 1.2 microns; the first glass frit powder 2.5% Bi 2 O 3 -B 2 O 3 -SiO 2 -K 2 O (Bi 2 O 3 : 82wt%) average particle size 0.6 microns, softening point 420℃; the second glass frit powder 2%, PbO-ZnO-SiO 2 , The average particle size is 6 microns, the softening point is 580°C; terpineol 9.5%, ethyl cellulose 1.5%, wetting and dispersing agent 1%.

[0044] The above materials are mixed and ground in a three-roll mill to a fineness of 15 microns to obtain electrode silver paste A2.

[0045] Polycrystalline silicon solar cells B2, C2, and D2 were prepared according to the method of Example 1.

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Abstract

The invention provides front electrode silver paste of a crystalline silicon solar battery and a preparation method for the front electrode silver paste. The silver paste comprises the following components in reference to the total weight of the silver paste: 75 to 90 percent of silver powder, 1 to 3 percent of first glass powder, 1 to 5 percent of second glass powder and 6 to 25 percent of organic component, wherein the softening point of the first glass powder is 350 to 550 DEG C; the softening point of the second glass powder is 550 to 650 DEG C; and a difference between the softening point of the first glass powder and the softening point of the second glass powder is at least 70 DEG C. The invention also provides the preparation method for the electrode silver paste. The electrode silver paste can be sintered at a relatively wide sintering temperature range; and the obtained solar battery is low in series resistance and high in photoelectric conversion rate.

Description

Technical field [0001] The invention belongs to the field of crystalline silicon solar cells, and relates to a crystalline silicon solar cell front electrode silver paste and a preparation method thereof. Background technique [0002] As the main solar photovoltaic power generation unit, crystalline silicon solar cells have developed rapidly. The front side of the solar cell is the side that directly receives solar energy, through a multilayer structure to achieve the widest receiving spectrum and the least light reflection consumption. The front side of conventional commercial crystalline silicon solar cells includes four main structures: silver electrode grid lines, non-conductive anti-reflection layer, n-type diffusion layer, and p-n junction region. The front electrode is an important part of crystalline silicon solar cells. The contact resistance between the electrode and n-type silicon, the conductivity of the electrode itself, and the aspect ratio of the electrode have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 郭冉周勇徐翔谭伟华陈龙
Owner BYD CO LTD
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