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A preparation method and application of a back electrode of a solar cell

A solar cell and back electrode technology, which is applied in the field of solar cells, can solve the problems of affecting the welding performance of the back electrode, increasing the cost of the back electrode paste, and increasing the width of the back electrode, so as to improve the photoelectric conversion efficiency, avoid serious leakage problems, and improve The effect of solderability and solder resistance

Active Publication Date: 2018-12-14
NANTONG T SUN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Printing the back silver paste directly on the aluminum paste may cause two problems. First, the mutual contact of silver and aluminum will affect the soldering performance of the back electrode; second, the edge of the back electrode needs to be covered by the aluminum back field, increasing the back electrode width, increasing the back electrode paste cost

Method used

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  • A preparation method and application of a back electrode of a solar cell
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  • A preparation method and application of a back electrode of a solar cell

Examples

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specific Embodiment 1

[0030] A method for preparing the back electrode of a solar cell, printing or spraying a layer of conductive barrier layer slurry on the back aluminum paste, the barrier layer slurry is directly printed on the back aluminum electrode, and after drying, a matching back electrode is printed on it The silver paste is dried and sintered to form the back electrode.

[0031] The barrier layer slurry includes the following in parts by weight: a total of 67 parts of metal nitride powder, silicon nitride compound powder, metal oxide powder or low melting point metal powder, 3 parts of lead-free glass powder, organic adhesive 29.8 parts of binder, 0.2 parts of organic additives.

[0032] The back silver paste used in combination includes the following parts by weight: 42 parts of hollow spherical silver powder with a purity greater than 99.99%, 15 parts of flake silver powder, 2.5 parts of lead-free glass powder, 40.1 parts of organic binder, 0.4 parts of organic auxiliary agent; where...

specific Embodiment 2

[0048] A method for preparing the back electrode of a solar cell, printing or spraying a layer of conductive barrier layer slurry on the back aluminum paste, the barrier layer slurry is directly printed on the back aluminum electrode, and after drying, a matching back electrode is printed on it The silver paste is dried and sintered to form the back electrode.

[0049] The barrier layer slurry includes the following in parts by weight: a total of 60 parts of metal nitride powder, silicon nitride compound powder, oxide powder or low-melting point metal powder, 5 parts of lead-free glass powder, organic bonding 34 parts of additives, 1 part of organic additives.

[0050] The back silver paste used in combination includes the following in parts by weight: 40 parts of hollow spherical silver powder with a purity greater than 99.99%, 20 parts of flake silver powder, 4 parts of lead-free glass powder, 35 parts of organic binder, 1 part of organic auxiliary agent; wherein, the parti...

specific Embodiment 3

[0066] A method for preparing the back electrode of a solar cell, printing or spraying a layer of conductive barrier layer slurry on the back aluminum paste, the barrier layer slurry is directly printed on the back aluminum electrode, and after drying, a matching back electrode is printed on it The silver paste is dried and sintered to form the back electrode.

[0067] The barrier layer slurry includes the following in parts by weight: a total of 58 parts of metal nitride powder, silicon nitride compound powder, metal oxide powder or low melting point metal powder, 3.5 parts of lead-free glass powder, organic adhesive 37.8 parts of binder, 0.7 parts of organic additives.

[0068] The back silver paste used in combination includes the following parts by weight: 45 parts of hollow spherical silver powder with a purity greater than 99.99%, 18 parts of flake silver powder, 3 parts of lead-free glass powder, 33.4 parts of organic binder, 0.6 parts of organic auxiliary agent; where...

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Abstract

The invention discloses a preparation method and application of a back electrode of a solar cell, which comprises two parts, a back electrode barrier layer and a back silver paste. 20 to 80 part of metal nitride powder, nitrogen-silicon compound powder, oxide powder or low-melting-point metal powder, 0.5 to 5 parts of lead-free glass powder, 10 to 40 parts of organic carrier and 0.1 to 1 part of organic assistant. 10-80 part of silver powder, 0. 5-5 parts of lead-free glass powder, 15-50 parts of organic bind and 0. 01-1 part of organic assistant. The present invention ensures that it has considerable welding pulling force and aging pulling force, avoids serious electric leakage problem caused by metal defects caused by direct contact between silver and silicon wafer or aluminum paste, improves photoelectric conversion efficiency of crystalline silicon battery, adjusts back electrode width and printed pattern, and reduces back electrode paste cost.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a preparation method and application of a back electrode of a solar cell. Background technique [0002] At present, the main function of the silver paste on the back of the solar cell is to provide soldering points for the back of the solar cell, so it has high requirements for its solderability, solder resistance, adhesion, efficiency improvement and cost reduction. A good back silver paste should have the following advantages, low activity, reduce the reaction between glass powder and passivation film, avoid the formation of a large number of recombination centers in the contact part between silver paste and silicon wafer or aluminum paste, improve the open circuit voltage of the cell, and wide Process window, suitable for low temperature sintering process, excellent adhesion and aging tension. Good printing performance and low silver content. [0003] In PERC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18
CPCH01L31/022433H01L31/022441Y02E10/50H01L31/022425C09D5/24C09D7/20C09D7/61C09D7/63C09D7/70H01L31/18
Inventor 朱鹏
Owner NANTONG T SUN NEW ENERGY CO LTD
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