Choosing an Emitter Cell Printing Alignment Method

Abstract

The invention provides a printing alignment method of a selective emitter cell, and relates to the field of printing of a positive electrode of an amorphous silicon solar cell. The printing alignmentmethod of the selective emitter cell comprises the steps of attaching a light-sensitive substance onto a tabletop, and determining a position of the light-sensitive substance by shooting of a camera;transferring a battery piece to the tabletop by a belt, and arranging a shielding box to block external light interference; giving out a CCD light source from the tabletop, shooting a part around thebattery piece by the camera, and determining a position of a central point of the battery piece; allowing printing equipment to pass through a central position of a tabletop positioning point and a central point position of the battery piece on the tabletop; determining angle deviation by a computer according to the central position of the tabletop positioning point and the central point positionof the battery piece; determining area of adjacent regions between the battery piece and the light-sensitive substance by the computer; respectively calculating X-axis offset and Y-axis offset; and performing alignment printing by a printing head.

Description

technical field [0001] The invention relates to the field of printing of positive electrodes of crystalline silicon solar cells, in particular to a method for aligning selective emitters of solar cells. Background technique [0002] In the current photovoltaic industry, the most important link that restricts the conversion efficiency of traditional batteries is the two processes of diffusion and metallization. These two processes are a pair of contradictions that restrict each other. [0003] In the diffusion process, low doping concentration can reduce the recombination probability of minority carriers, and can perform better surface passivation, reduce the surface recombination probability of minority carriers, thereby reducing the reverse saturation current of the battery and improving the battery life. open circuit voltage and short circuit current. In addition, the closer to the surface of the solar cell, the higher the probability of photogenerated carriers, and the c...

AI Technical Summary

Problems solved by technology

In actual production, how to control the area of ​​the electrode contact area and the area covered by the grid line, and the area of ​​the electrode contact area and the area covered by the grid line, so that the smaller difference in this area will make the selective emission (se) battery more profitable Recently, some manufacturers have achieved this goal by improving the accuracy of printing equipment, but a large number of old equipment do not have this function, and the transformation requires greater investment

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