Method for adjusting offset of main and auxiliary grids of step-by-step printed solar cell

Abstract

The invention discloses a method for adjusting offset of main and auxiliary grids of a step-by-step printed solar cell. The method comprises the following steps: independently trial-printing the auxiliary grids and the main grid on a silicon wafer provided with a laser groove; measuring the distance x between the adjacent laser grooves; measuring the distance between the adjacent auxiliary grids and the distance between the adjacent lap joint units on the same main grid; calculating an auxiliary grid offset interval and a main grid offset interval; adjusting the secondary grid mesh according to the secondary grid offset distance; and adjusting the main grid screen printing plate according to the main grid offset distance. According to the adjusting method, the four parameters of the main grid screen printing plate, the auxiliary grid screen printing plate tension value and the screen printing plate PT value are adjusted, the deviation between the main grid and the auxiliary grid is effectively eliminated, the collection and transportation of carriers by the electrode grid lines are improved, and therefore the conversion efficiency of the solar cell is improved; the reliability is also improved.

Description

technical field [0001] The invention relates to the field of solar cell electrode printing, in particular to a method for adjusting the offset of main and auxiliary grids of solar cells printed step by step. Background technique [0002] Screen printing is a commonly used solar cell printing technology at present. Its basic operation process is: place the silicon wafer with laser grooves on the workbench, pour the slurry on the screen above the workbench, and then use a scraper to place it on the workbench. Apply a certain pressure on the screen, and at the same time move the scraper from one end of the screen to the other, the slurry can be squeezed from the mesh of the graphic part onto the silicon wafer, thereby completing the screen printing. In the current printing process, the printing effect is mostly adjusted through parameters such as printing pressure, printing pitch, printing speed, and printing height. [0003] However, with the development of solar cell technol...

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Problems solved by technology

[0006] However, when using step-by-step printing and printing the sub-grid electrode into the laser groove, the offsets of the two are inconsistent due to the inconsistent screen parameters used for printing the main and sub-grid

Therefore, the overlap between the main and auxiliary grids is often easy to shift, which can easily cause carrier transmission loss and reduce battery reliability.

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