Production method of grating electrode of solar cell

Abstract

The invention discloses a production method of a grating electrode of a solar cell. The production method includes the steps of attaching two dry photosensitive films to two sides of a silicon substrate, respectively; determining a specific position of the silicon substrate between the dry photosensitive films, and mounting a mask, which has a grating grid pattern required, on the dry photosensitive films; according to the determined position of the silicon substrate, fully overlapping the mask and the silicon substrate; exposing the dry photosensitive films on the silicon substrate; transferring the grid pattern of the mask to the surface of one dry photosensitive film; developing the silicon substrate which is exposed, so as to form the grating grid pattern on the surface of the silicon substrate; plating conductive material on the grating grid pattern on the surface of the silicon substrate so as to form the grating electrode. The production method has the advantages that shearing peripheral residual dry films from the silicon substrate of the cell is not required, damage of the silicon substrate is avoided, the method is simple, positioning is accurate and yield is high.

Description

technical field [0001] The invention relates to the field of solar cell preparation, in particular to the preparation of solar cell grid wire electrodes. Background technique [0002] The solar cell includes a supporting solar cell sheet and surface electrodes connected to the cell sheet, and the current generated by the cell sheet is exported through the electrode. In order to reduce the power loss derived from the current and improve the solar energy conversion rate, the electrodes of the solar cells used are mostly grid-line electrodes in a grid pattern. (busbar), the sub grid line and the bus bar line are cross-connected as a whole; the current generated by the battery sheet through the photoelectric effect is collected on the sub grid line, and the sub grid line collects the current on the bus bar line and finally flows out. [0003] In the past, grid line electrodes were made by printing silver paste on the surface of the silicon substrate of the battery, and then sin...

AI Technical Summary

Problems solved by technology

Printing with silver paste needs to install a template on the silicon substrate of the cell, so the grid electrode prepared by this method often has a negative effect on the printing paste during the printing process due to the latitude and longitude nodes of the template itself. It will lead to non-uniform wire diameter of fine grid lines after printing; and the thickness of the printing template is not easy to control, and it is difficult to achieve fine film printing. These factors will ultimately affect the light conversion rate of solar cells

The defects of the above-mentioned preparation process can be eliminated by pasting dry film on the silicon substrate of the battery and then exposing, developing and electroplating. However, the area of ​​the dry film used in this process is usually larger than the area of ​​the silicon substrate. Since the dry film is opaque, it is difficult to The position of the silicon substrate under the dry film is also difficult to determine

The existing process is to cut off the excess dry film around the silicon substrate and then install a mask on it. This process is time-consuming and laborious and may damage the silicon substrate and increase production costs.

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