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Silver conductive slurry used for solar cell, solar cell, and solar cell preparation method

A technology for solar cells and solar cells, applied in the field of solar cells, can solve the problems of low density of grid lines in the seed layer, increased shading area, decreased short-circuit current of cells, etc.

Active Publication Date: 2014-01-15
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is that the fineness of the grid lines of the seed layer prepared by printing with silver conductive paste for the existing solar cells is low, resulting in an excessive increase in the width of the front electrode grid lines after light-induced electroplating, and an increase in the shading area. The short-circuit current of the battery decreases, and the photoelectric conversion efficiency of the battery is not ideal. A seed layer grid line that can be prepared with a high density, is not easy to break, and is not easy to peel off, so as to prepare a battery with low resistance and high fill factor. Silver conductive paste for solar cells with high photoelectric conversion efficiency and low cost, solar cells prepared by using the silver conductive paste, and preparation method of the solar cells

Method used

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  • Silver conductive slurry used for solar cell, solar cell, and solar cell preparation method

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preparation example Construction

[0020] In the preparation method of the above-mentioned silver conductive paste of the present invention, the conductive phase, conductive metal powder, inorganic binder and organic vehicle can be mixed and ground to a certain fineness. Wherein, the mixing method of the present invention is not limited, and is designed according to actual conditions. For example, it can be:

[0021] (1) Dissolve the thickener such as ethyl cellulose, additives such as lubricants and thixotropic agents in terpineol or other mixed solvents composed of the above-mentioned organic solvents, and make the ethyl cellulose The cellulose is fully dissolved and stirred evenly to obtain a transparent organic carrier.

[0022] (2) Put the organic carrier in the stainless steel tank of the high-speed disperser, add glass powder and silver-silicon alloy powder while stirring, and stir well; add silver-silicon powder in several times, after adding all, stir at high speed; Use a three-roll mill to grind the...

Embodiment 1

[0035] This example is used to prepare silver conductive paste.

[0036] (1) Preparation of glass powder

[0037] Take 79wt% Bi 2 o 3 , 10wt% SiO 2 , 8wt% ZnO, 3wt% TiO 2 , use a V-type mixer to mix evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, preheat it to 550°C, keep it warm for 0.5h, then raise it to 1250°C, melt it for 0.5h, water quench and filter, and the glass will be obtained Put the beads into the ball mill tank, control the mass ratio, zirconia ball: glass beads: deionized water = 4: 1: 0.7, tank speed 300 / min, ball mill for 7 hours, filter, dry, dry mill for 1 hour, and oxidize during dry milling The mass ratio of zirconium balls to glass beads is 1:2. Test the medium particle size D of the glass powder 50 0.65μm, softening point (T s ) at 510°C.

[0038] (2) Configuration of organic carrier

[0039] According to the mass ratio of lauryl alcohol ester: butyl carbitol: butyl carbitol acetate = 70:20:10, the organic sol...

Embodiment 2

[0043] Adopt the method identical with embodiment 1 to prepare silver conductive paste sample S2, difference is silver-silicon alloy powder, and silver element content is 95.00 ± 0.05wt% in the silver-silicon alloy powder, and the tap density of silver-silicon alloy powder is 4.98g / cm 3 , the viscosity of test sample S2 is 62.6 Pas.

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Abstract

The invention provides silver conductive slurry used for solar cells, a solar cell, and a solar cell preparation method. The silver conductive slurry comprises a conductive phase, an inorganic binder and an organic carrier. The conductive phase contains 40 to 60% by weight of silver and silicon alloy powder, with the total amount of the silver conductive slurry being a reference. A prepared seed layer is smooth and low, no line breaking phenomenon tends to occur, a prepared electrode on the right side has a fine and smooth surface which has no nodes and holes, etc. Meanwhile, the silver conductive slurry exhibits high welding strength, can be firmly adhered to a silicon substrate, provides a basis for preparation of solar cells, and especially enables cell filling factors and the conversion efficiency to be greatly improved compared with conventional silver conductive slurry that is used for preparing a seed layer for a cell. Furthermore, the silver conductive slurry is easy to prepare, and simple in process and low in cost.

Description

technical field [0001] The invention relates to the field of solar cells, more specifically, the invention relates to a silver conductive paste for solar cells, a solar cell prepared by using the silver conductive paste and a preparation method of the solar cell. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention due to its advantages of inexhaustibility, no pollution, and no limitation of geographical resources. Existing silicon-based solar cells generally prepare electrodes and back field by printing conductive paste containing conductive metal powder, glass powder and organic vehicle on a silicon substrate, drying and firing. The back electrode of the solar cell silicon substrate is generally the positive electrode, and the coated conductive paste is usually the back silver paste; the back surface is generally coated with an aluminum-containing conductive paste, which forms an aluminum back field after sintering, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224H01L31/18C03C12/00
CPCY02P70/50
Inventor 谭伟华廖辉管玉龙符燕青
Owner BYD CO LTD
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