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A kind of front electrode silver paste of crystalline silicon solar cell and preparation method thereof

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: 2016-05-11
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, which includes mixing and grinding silver powder, first glass powder, second glass powder and organic components.

[0025]The method for preparing the front electrode of a solar cell according to the specific embodiment of the present invention comprises the following steps: printing the front electrode paste according to the specific embodiment of the present invention on the light-receiving surface of the semiconductor substrate by screen printing, drying, and then rapid sintering Forming the front electrode of the solar cell; 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 the large-scale industrial production of crystalline silicon solar cells today. It generally includes four stages: the combustion of organic ma...

Embodiment 1

[0034] 1. Preparation of electrode silver paste

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

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

[0037] 2. Preparation of polycrystalline silicon solar cells

[0038] First, the surface texture of three P-type polysilicon wafers with an area of ​​156 mm × 156 mm was carried out: the polysilicon wafers were soaked in a solution of 20 wt % and 10 wt % of NaOH and ethanol at 75 ° C for 40 min. Take out the polysilicon chip, wash it with deionized water 10 times, to wash off the remaining texturing liquid on 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 ° C; second glass frit powder 2%, PbO-ZnO-SiO 2 , average particle size 6 microns, softening point 580 ° C; 9.5% terpineol, ethyl cellulose 1.5%, 1% wetting and dispersing agent.

[0044] The above materials were mixed and ground in a three-roller 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 relates to the field of crystalline silicon solar cells, in particular to a silver paste for a front electrode of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] Crystalline silicon solar cells have developed rapidly as the main solar photovoltaic power generation unit. The front side of the solar cell is the side that directly receives solar energy, and a multi-layer structure is used to achieve the widest receiving spectral line and the least light reflection consumption. The front side of conventional commercial crystalline silicon solar cells includes four main structures of 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 r...

Claims

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Application Information

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Patent Type & Authority Patents(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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