A kind of aluminum conductive paste for solar cell and preparation method thereof

A technology of solar cells and conductive paste, applied in the field of solar cells, can solve the problems of insufficient photoelectric conversion efficiency, bending of silicon wafers, etc.

Active Publication Date: 2015-12-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problems in the prior art that the silicon wafer is bent after the sintering of the aluminum conductive paste of the solar cell, and the photoelectric conversion efficiency cannot meet the further development of the cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0029] (1) Preparation of glass powder

[0030] Get 55wt% bismuth oxide (Bi 2 o 3 ), 25wt% boron trioxide (B 2 o 3 ), 15wt% silicon dioxide (SiO 2 ), 3.5wt% calcium oxide (CaO), 1.5wt% magnesium oxide (MgO), use a V-type mixer to mix the components evenly, put them into a porcelain crucible, put them into a silicon carbide rod furnace, and heat up to preheat Heat to 550°C, keep warm for 0.5h, then rise to 1250°C, smelt for 0.5h, quench and filter with water, put the obtained glass beads into a ball mill jar, and control the mass ratio of zirconia balls: glass beads: deionized water = 4:1: 0.6, rotating speed 250 rpm, ball milling for 7h, drying after filtration, and then dry milling for 0.5h. During dry milling, the mass ratio of zirconia balls to glass powder is 1:2, and the medium particle size D 50 1.5μm glass powder, set aside.

...

Embodiment 2

[0036] The same steps as in Example 1 were used to prepare the aluminum conductive paste S2 for solar cells in this example, except that in step (3), the amount of β-eucryptite powder was changed from 2.5 parts by weight to 5 parts by weight, The consumption of glass powder is changed into 0.5 weight part by 1.5 weight part, and the consumption of aluminum powder is changed into 72.5 weight part by 74 weight part.

Embodiment 3

[0038] The same steps as in Example 1 were used to prepare the aluminum conductive paste S2 for solar cells of this example, the difference is that in step (3), the median particle size D of β-eucryptite powder 50 Changed from 1.5μm to 5.0μm.

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Abstract

The invention provides aluminum electrically conductive slurry used for a solar cell and a preparation method thereof. The aluminum electrically conductive slurry used for the solar cell comprises the following components: aluminum powder, glass powder, an organic carrier and an inorganic additive powder, wherein the inorganic additive powder with the intermediate grain size D50 of 0.1-5.0 microns is one or more selected from beta-eucryptite, zirconium tungstate or zirconium vanadate. After the aluminum electrically conductive slurry used for the solar cell is silk-screen printed to a crystal silicon solar cell and is sintered into a film, the metal film is attached to a silicon substrate firmly. The aluminum electrically conductive slurry used for the solar cell has a smooth and compact surface, is free from aluminum beads and aluminum blistersm and has high photoelectric conversion efficiency; the warping degree of the cell is small; and the average warping degree of the 156*156 type polycrystalline silicon solar cell is less than 0.50 mm.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to an aluminum conductive paste for solar cells and a preparation method thereof. Background technique [0002] Solar cells are an inexhaustible green and environmentally friendly renewable energy, and the current international research is very active. Aluminum conductive paste is one of the electronic information materials, and it is also the main auxiliary material for making solar cells. In the current manufacturing process of crystalline silicon solar cells, the aluminum conductive paste is printed on almost the entire backlight surface of the cell. -7 / °C, 20-300°C) and silicon (expansion coefficient is 26×10 -7 / °C, 20-300°C), the difference in thermal expansion coefficient causes the aluminum conductive paste to generate stress in the silicon wafer during sintering, causing the silicon wafer to bend. [0003] In order to further reduce the manufacturing cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 谭伟华
Owner BYD CO LTD
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