Aluminum electrically conductive slurry used 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: 2013-06-26
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 c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

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

[0029] (1) Preparation of glass powder

[0030] Take 55wt% of bismuth oxide (Bi 2 O 3 ), 25wt% of 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 uniformly, put them into a porcelain crucible, put them into a silicon carbide furnace, and warm up and preheat Heat for 0.5h at 550℃, then raise to 1250℃, smelt for 0.5h, water quench and filter, put the obtained glass beads into a ball milling tank, control the mass ratio of zirconia balls: glass beads: deionized water = 4:1: 0.6, rotating speed 250 rpm, ball milling for 7 hours, drying after filtering, and then dry grinding for 0.5 hours. The mass ratio of zirconia ball to glass powder during dry grinding is 1:2, and the medium particle size D is obtained. 50 It ...

Example Embodiment

[0035] Example 2

[0036] The aluminum conductive paste S2 for solar cells of this example was prepared by the same steps as in Example 1, 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 amount of glass powder was changed from 1.5 parts by weight to 0.5 parts by weight, and the amount of aluminum powder was changed from 74 parts by weight to 72.5 parts by weight.

Example Embodiment

[0037] Example 3

[0038] The aluminum conductive paste S2 for solar cells of this embodiment was prepared by the same steps as in embodiment 1, except that: in step (3), the medium 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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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 谭伟华
Owner BYD CO LTD
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