Solar battery laser back electrode window opening end point judging method

Abstract

The invention relates to a solar battery laser back electrode window opening end point judging method. According to the method, the laser with the same wavelength and frequency is used for carrying out continuous etching for many times on the back side of a battery piece, a step-shaped structure is formed at the finally obtained back side of the battery piece, the battery surface resistivity under each step surface is respectively measured, and finally, the corresponding relationship between the laser window opening end point and the laser thinning time number is obtained, so the thinning laser repeating time number required by the etching removal of a back side passivation layer is found. Compared with the traditional method, the continuous proceeding mode is adopted for the thinning of the back passivation layer, and similarly, the continuous proceeding mode is adopted for the surface resistivity measurement, so the detection time is greatly shortened, the production efficiency is improved, and in addition, the state information after the etching in each time can be completely remained by samples obtained after the final etching. The window opening end point judging method provided by the invention has the advantages that simplicity is realized, the implementation is easy, the cost is low, and in addition, the precision is higher.

Description

technical field [0001] The invention relates to a method for judging the window opening end point of a laser back electrode window of a solar battery, belonging to the technical field of solar batteries. Background technique [0002] With the improvement of people's awareness of environmental protection, the demand for clean energy is increasing. Among the new clean energy researched by people, solar energy, as a clean energy that is not subject to geographical restrictions, has become the main direction of new energy development in the future. Solar cells are the main devices that people use the sun's light energy to convert into electrical energy. However, the conversion efficiency of solar cells cannot meet people's requirements at present. Improving the conversion efficiency of solar cells and reducing the manufacturing cost of solar cells has become a research hotspot. [0003] In order to improve the conversion efficiency of the battery, various studies on the struc...

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Problems solved by technology

[0005] However, if the laser energy is too high, the silicon lattice structure on the surface of the battery will be destroyed, thereby forming a high recombination layer and reducing the efficiency of the battery; and if the laser energy is too low, the purpose of completely etching the insulating passivation layer cannot be achieved, so the laser There is a certain degree of difficulty in the window opening process of the back electrode window

Since the state of the back surface of each batch of solar cells is different, the laser back electrode window opening process is difficult to produce with a certain laser parameter

Therefore, the laser back electrode window opening process is difficult to be directly applied to large-scale battery production

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