Conductive paste for solar cell and preparation method thereof

A technology of solar cells and conductive pastes, applied in the direction of conductive coatings, conductive materials, conductive materials, etc., can solve the problems of manufacturing personnel and environmental pollution, and achieve the effect of low raw material cost and stable performance

Inactive Publication Date: 2011-04-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a new type of conductive paste for solar cells with excellent performance, environmental protection and low cost in order to solve t

Method used

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  • Conductive paste for solar cell and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0030] Step 1: Configuration of water-based adhesive

[0031] Based on the total weight of the water-based adhesive to be prepared, take 2 parts by weight of sodium carboxymethylcellulose (CMC) and dissolve it in 98 parts of deionized water, heat it to 70°C to fully dissolve it, and stir it evenly , to obtain a uniform and clear water-based adhesive A1.

[0032] Step 2: Preparation of Inorganic Adhesive

[0033] 65 parts by weight of bismuth oxide, 20 parts by weight of boron trioxide, 8 parts by weight of silicon dioxide, 6 parts by weight of zinc oxide, and 1 part by weight of aluminum oxide were added to a high-speed V-shaped mixer and mixed for 20 minutes. until uniform to obtain oxide mixture powder. Put the mixture into a porcelain crucible, put it into a silicon carbide rod furnace, heat it up to 500°C and keep it for 0.5 hours, t...

Embodiment 2

[0037] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0038] Step 1: Configuration of water-based adhesive

[0039] Based on the total weight of the water-based adhesive to be prepared, take 5 parts by weight of sodium carboxymethylcellulose (CMC) and dissolve it in 95 parts of deionized water, heat it to 70°C to fully dissolve it, and stir it evenly , to obtain a uniform and clear water-based adhesive A2.

[0040] Step 2: Preparation of Inorganic Adhesive

[0041] 63 parts by weight of lead oxide, 13 parts by weight of diboron trioxide, 9 parts by weight of silicon dioxide, 8 parts by weight of zinc oxide, 4.5 parts by weight of aluminum oxide, and 0.5 parts by weight of cobalt oxide are added to the high-speed V Mix in a type mixer for 20 minutes until uniform to obtain oxide mixture powder. Put the mixture into a porcelain crucible, put it into a silicon carbide rod furnace, heat it up t...

Embodiment 3

[0045] This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

[0046] Step 1: Configuration of water-based adhesive

[0047] Based on the total weight of the water-based adhesive to be prepared, 6 parts by weight of hydroxyethyl cellulose (HEC) was dissolved in 94 parts of deionized water, heated to 75 ° C, fully dissolved, and stirred evenly, A homogeneous and clear aqueous binder A3 was obtained.

[0048] Step 2: Preparation of Inorganic Adhesive

[0049] Add 78 parts by weight of lead oxide, 8 parts by weight of diboron trioxide, 8 parts by weight of silicon dioxide, and 6 parts by weight of zinc oxide into a high-speed V-shaped mixer and mix for 60 minutes until uniform to obtain an oxide mixture powder. This oxide powder is used as an inorganic binder.

[0050] Step 3: Preparation of solar cell conductive paste

[0051] Based on the total weight of the solar cell conductive paste that needs t...

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Abstract

The invention provides a conductive paste for a solar cell, comprising the following components based on the total weight: 60-85 percent by weight of conductive metal powder, 0.5-10.0 percent by weight of inorganic binder, 10.0-30.0 percent by weight of water-borne binder and 0.05-5.0 percent by weight of additive, wherein the water-borne binder is a solution formed by dissolving a water-borne polymer into the water. The conductive paste for the solar cell, provided by the invention, has no organic solvent and pollution, is environment-friendly and has low cost of materials; the mesh leakage can be avoided when the conductive paste is stood in a screen mesh; the phenomena of settling and aggregation can be avoided after the conductive paste is stored for a long time; after being subjected to the silk-screen sintering, the conductive paste has firm adhesive force to a silicon matrix and excellent electrical performance; and the average photoelectric conversion efficiency of the produced monocrystal silicon solar cell is more than 17.80 percent.

Description

technical field [0001] The invention belongs to the field of materials for solar cells, in particular to a conductive paste for crystalline silicon solar cells and a preparation method thereof. Background technique [0002] As a kind of green energy, solar energy has been paid more and more attention by people. In existing silicon-based solar cells, electrodes or back fields are generally prepared by printing conductive paste on a silicon substrate, drying and firing. The front electrode of the silicon substrate of a solar cell is generally a negative electrode, and the coated conductive paste is usually a conductive silver paste; the back electrode is generally a positive electrode, and the coated conductive paste is usually a conductive silver paste and a back field aluminum paste. Conductive paste has a great influence on the performance of solar cells. At present, the research on conductive paste mainly focuses on: (1) how to improve the photoelectric conversion effici...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18H01B1/00H01B1/02H01B13/00
CPCC09D11/52Y02E10/50H01B1/16H01L31/022425C09D5/24
Inventor 谭伟华刘珍周勇姜占锋
Owner BYD CO LTD
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