Edge deletion method for thin-film solar cells

Abstract

The invention belongs to the field of laser processing, discloses an edge deletion method for thin-film solar cells, and concretely relates to a method for carrying out edge deletion on thin-film solar cells by using ultra-short pulse laser. The method disclosed by the invention is importantly characterized in that high-peak-power ultra-short pulse laser with an extremely high transparent conductive film absorption rate is introduced into an application of carrying out edge deletion on thin-film solar cells. Compared with laser power used by edge deletion implemented by using infrared nanosecond laser, the method can complete high-efficiency and high-quality laser edge deletion by using smaller average laser power; and glass is not easy to be damaged, the compatibility with different kinds of transparent conductive films is extremely strong, and the application cost is reduced.

Description

technical field [0001] The invention belongs to the field of laser processing, in particular to the field of edge cleaning of laser thin film solar cells. Background technique [0002] At present, the development of thin-film solar energy is in the ascendant. The last process of thin-film solar glass substrate battery is to hermetically encapsulate the glass substrate. Thin film and active layer film) need to be cleaned, which is called edge cleaning or edge sweeping in the industry. The method of sandblasting was the first method, which was low in cost, but caused serious environmental pollution, so it was gradually eliminated. [0003] Using a laser to directly vaporize the surrounding area of ​​the battery glass through the glass is a relatively popular method at present. In order to meet the production rhythm of one piece of glass per minute, the industry usually uses a high-power infrared laser of 200W to 500W for laser edge cleaning. Since this kind of laser is a side...

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Problems solved by technology

[0005] We can think that during the laser edge cleaning process, the solar film is directly vaporized under the action of the laser. The total thickness of these films does not exceed 5 microns, and the total thickness of the solar film of most batteries does not even exceed 2 microns. The energy required can be determined according to the relevant The heat of vaporization of the material is calculated, but it is certain that most of the energy is not absorbed and wasted directly when a high-power infrared laser of 200W to 500W is used for laser edge cleaning.

This is because the conductive film of thin-film solar cells is transparent to visible light and has a certain transmittance to infrared light. Obviously, using infrared laser for laser edge cleaning is not a reasonable laser edge cleaning solution.

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