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Solar battery slurry processing method and corresponding solar battery

A technology of solar cells and processing methods, applied in the field of solar cells, can solve problems such as strong leakage current, failure, and efficiency decline of crystalline silicon solar cells, and achieve the effect of improving electrical performance

Inactive Publication Date: 2012-08-01
WUXI SUNTECH POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] During the sintering process or the long-term use of the battery sheet with the paste on the edge or side, the metal ions (such as silver or aluminum) in the paste will be thermally diffused, which will easily form a metal short-circuit channel, resulting in the p-zone of the battery The n+ region of the emitter is connected by a metal short-circuit channel, thereby generating a strong leakage current, which greatly reduces the efficiency of the crystalline silicon solar cell or even fails

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  • Solar battery slurry processing method and corresponding solar battery
  • Solar battery slurry processing method and corresponding solar battery
  • Solar battery slurry processing method and corresponding solar battery

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the structures shown in the accompanying drawings are only schematic.

[0021] According to an example of the present invention, the solar cells with residual paste on the edge are first screened out, and then the edge portion of the cell with the paste on the cell is cut off by a laser beam. Schematically, the solar cells with residual slurry on the edge can be found out manually, or the solar cell with residual slurry on the edge can be detected by means of a detector. A laser may be used to direct a laser beam at the edge portion of the solar cell with the residual paste, and the laser beam preferably has a laser wavelength of 355 nm or 532 nm.

[0022] According to the present invention, the residual paste can be anywhere in the cell, but preferably, the present invention is used to treat residual paste at the edge of the cell.

[0023] Ac...

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Abstract

The invention provides a solar battery residual slurry processing method and a corresponding solar battery. The solar battery residual slurry processing method comprises screening out a solar battery whose edge has residual slurry and removing edge portions of the solar battery which have the residual slurry by laser beam cutting. The solar battery which is formed with the solar battery residual slurry processing method comprises one or more gaps, and the gaps are matched with the edge portions which are corresponding to the removed residual slurry. According to the invention, after the residual slurry is removed, the electrical performance of the solar battery is improved evidently.

Description

【Technical field】 [0001] The invention relates to solar cell technology, in particular to a solar cell edge slurry treatment method and a corresponding solar cell. 【Background technique】 [0002] The production process of crystalline silicon solar cells generally uses screen printing paste to form electrodes, including the formation of back electrodes, back electric fields and front electrodes by screen printing. [0003] During the printing process, pastes such as silver paste or aluminum paste are often stained on the printed battery sheet due to the rupture of the printing screen. Since there is a certain height difference between the printing screen at the edge of the cell (the thickness of the cell is about 200 μm), the force on the printing screen at the edge of the cell is the greatest during the printing process, which makes the printing screen at the edge of the cell Areas are more prone to breakage. Based on this, in most cases, the paste will leak from the print...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/04H01L31/0352
CPCY02E10/50Y02P70/50
Inventor 何悦窦亚楠叶俊黄治国
Owner WUXI SUNTECH POWER CO LTD