Windowing terminal point determining method for solar energy cell laser back electrode window

Abstract

The invention relates to a windowing terminal point determining method for a solar energy cell laser back electrode window. According to the method, a back face of a cell is continuously etched for multiple times by utilizing laser with same wavelength and frequency, and the back face of the cell is finally a step-like structure, cell surface resistivity of each step surface is respectively measured, the corresponding relationship between a laser windowing terminal point and the laser thinning times is finally acquired, and thereby the thinning laser repetition times required for etching a back face passivation layer can be acquired. Compared with a traditional method, the back face passivation layer is thinned in a continuous mode, surface resistivity is further measured in a continuous mode, so the detection time is greatly shortened, production efficiency is improved, samples can be acquired through etching, and the state information after each etching can be integrally kept. The windowing terminal point determining method has advantages of simple and easy operation, low cost and relatively high precision.

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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